{"id":104911,"date":"2025-04-07T02:06:35","date_gmt":"2025-04-06T21:36:35","guid":{"rendered":"https:\/\/nabfollower.com\/blog\/a-case-where-sql-joins-struggle-but-mongodb-documents-shine-11kj\/"},"modified":"2025-04-07T02:06:35","modified_gmt":"2025-04-06T21:36:35","slug":"a-case-where-sql-joins-struggle-but-mongodb-documents-shine-11kj","status":"publish","type":"post","link":"https:\/\/nabfollower.com\/blog\/a-case-where-sql-joins-struggle-but-mongodb-documents-shine-11kj\/","title":{"rendered":"\u0645\u0648\u0631\u062f\u06cc \u06a9\u0647 SQL \u0628\u0647 \u0645\u0628\u0627\u0631\u0632\u0647 \u0645\u06cc \u067e\u06cc\u0648\u0646\u062f\u062f \u0627\u0645\u0627 \u0627\u0633\u0646\u0627\u062f MongoDB \u0645\u06cc \u062f\u0631\u062e\u0634\u062f"},"content":{"rendered":"<div data-article-id=\"2384679\" id=\"article-body\">\n<p>\u0627\u062f\u0639\u0627\u0647\u0627\u06cc\u06cc \u0627\u0632 \u0642\u0628\u06cc\u0644 &#8220;\u067e\u06cc\u0648\u0633\u062a\u0646 \u0622\u0647\u0633\u062a\u0647&#8221; \u06cc\u0627 &#8220;\u067e\u06cc\u0648\u0633\u062a\u0646 \u0628\u0647 \u0645\u0642\u06cc\u0627\u0633&#8221; \u0646\u06cc\u0633\u062a \u060c \u0627\u063a\u0644\u0628 \u0645\u0646 \u0631\u0627 \u0648\u0627\u062f\u0627\u0631 \u0645\u06cc \u06a9\u0646\u062f \u062a\u0627 \u0646\u0634\u0627\u0646 \u062f\u0647\u0645 \u06a9\u0647 \u0686\u06af\u0648\u0646\u0647 \u0645\u06cc \u062a\u0648\u0627\u0646 \u0631\u062f\u06cc\u0641 \u0647\u0627\u06cc \u06a9\u0627\u0631\u0622\u0645\u062f \u0631\u0627 \u062f\u0631 \u06cc\u06a9 \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 SQL (\u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u0645\u062b\u0627\u0644) \u067e\u06cc\u0648\u0633\u062a. \u0628\u0627 \u0627\u06cc\u0646 \u062d\u0627\u0644 \u060c \u062f\u0631\u06a9 \u06a9\u0627\u0631\u0628\u0631 \u0627\u0632 \u06a9\u0646\u062f\u06cc \u0628\u0627\u0642\u06cc \u0645\u0627\u0646\u062f\u0647 \u0627\u0633\u062a \u060c \u0648 \u06af\u0648\u0634 \u062f\u0627\u062f\u0646 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\u0627\u06cc\u0646 \u0645\u062d\u062f\u0648\u062f\u06cc\u062a \u0628\u0648\u062c\u0648\u062f \u0645\u06cc \u0622\u06cc\u062f \u0632\u06cc\u0631\u0627 \u0634\u0627\u062e\u0635 \u0647\u0627 \u062f\u0631 \u0647\u0646\u06af\u0627\u0645 \u0627\u0646\u062a\u062e\u0627\u0628\u0627\u062a \u0627\u0646\u062a\u062e\u0627\u0628\u06cc \u062f\u0631 \u0647\u0645\u0627\u0646 \u062c\u062f\u0648\u0644 \u06a9\u0627\u0631\u0622\u0645\u062f \u0647\u0633\u062a\u0646\u062f. \u0628\u0627 \u0627\u06cc\u0646 \u062d\u0627\u0644 \u060c \u062d\u062f\u0627\u0642\u0644 \u0634\u0627\u062e\u0635 \u0686\u0646\u062f \u062c\u062f\u0648\u0644 \u060c \u062d\u062f\u0627\u0642\u0644 \u0628\u0631\u0627\u06cc OLTP \u0648\u062c\u0648\u062f \u0646\u062f\u0627\u0631\u062f. \u0627\u0646\u0628\u0627\u0631\u0647\u0627\u06cc \u062f\u0627\u062f\u0647 \u062f\u0631 \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u0647\u0627\u06cc \u0627\u0648\u0631\u0627\u06a9\u0644 \u0645\u06cc \u062a\u0648\u0627\u0646\u0646\u062f \u0627\u0632 \u0634\u0627\u062e\u0635 \u0647\u0627\u06cc \u067e\u06cc\u0648\u0633\u062a\u0646 Bitmap \u060c \u062a\u062d\u0648\u0644 \u0633\u062a\u0627\u0631\u0647 \u0648 \u0646\u0645\u0627\u0647\u0627\u06cc \u0645\u0627\u062f\u06cc \u0628\u0631\u0627\u06cc \u063a\u0644\u0628\u0647 \u0628\u0631 \u0627\u06cc\u0646 \u0627\u0645\u0631 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u0646\u062f \u060c \u0627\u0645\u0627 \u0622\u0646\u0647\u0627 \u0628\u0631\u0627\u06cc \u0628\u0627\u0631 \u06a9\u0627\u0631\u06cc OLTP \u0645\u0646\u0627\u0633\u0628 \u0646\u06cc\u0633\u062a\u0646\u062f. \u0627\u06cc\u0646 \u0628\u0631\u0646\u0627\u0645\u0647 \u0647\u0627\u06cc \u0627\u0639\u062f\u0627\u0645 \u0632\u06cc\u0631 \u062d\u062f \u0645\u062a\u0648\u0633\u0637 \u200b\u200b\u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u0628\u0647 \u0647\u0645\u06cc\u0646 \u062f\u0644\u06cc\u0644 \u0628\u0627\u0634\u062f \u06a9\u0647 \u062a\u0648\u0633\u0639\u0647 \u062f\u0647\u0646\u062f\u06af\u0627\u0646 \u0641\u06a9\u0631 \u0645\u06cc \u06a9\u0646\u0646\u062f \u06a9\u0647 \u067e\u06cc\u0648\u0633\u062a\u0646 \u0628\u0647 \u0622\u0646\u0647\u0627 \u06a9\u0646\u062f \u0627\u0633\u062a \u060c \u062d\u062a\u06cc \u0627\u06af\u0631 \u0627\u06cc\u0646 \u0627\u0645\u0631 \u0628\u0647 \u062e\u0648\u062f\u06cc \u062e\u0648\u062f \u0627\u0646\u062c\u0627\u0645 \u0634\u0648\u062f \u06a9\u0647 \u06a9\u0646\u062f \u0628\u0627\u0634\u062f.<\/p>\n<p>\u0633\u0648\u0621\u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u06a9\u0645\u06a9 \u06a9\u0646\u062f \u060c \u0627\u0645\u0627 \u0645\u0632\u0627\u06cc\u0627\u06cc \u0639\u0627\u062f\u06cc \u0633\u0627\u0632\u06cc \u0631\u0627 \u062a\u0636\u0639\u06cc\u0641 \u0645\u06cc \u06a9\u0646\u062f. \u062f\u0631 \u0645\u0642\u0627\u0628\u0644 \u060c \u0628\u0627\u0646\u06a9\u0647\u0627\u06cc \u0627\u0637\u0644\u0627\u0639\u0627\u062a\u06cc \u0627\u0633\u0646\u0627\u062f \u0645\u0627\u0646\u0646\u062f MongoDB \u0627\u0632 \u0627\u0633\u0646\u0627\u062f \u062a\u0639\u0628\u06cc\u0647 \u0634\u062f\u0647 \u0628\u0631\u0627\u06cc \u0628\u0647\u06cc\u0646\u0647 \u0633\u0627\u0632\u06cc \u0646\u0645\u0627\u06cc\u0634 \u062f\u0627\u062f\u0647 \u0647\u0627\u06cc \u067e\u06cc\u0686\u06cc\u062f\u0647 \u0628\u0627 \u067e\u06cc\u0648\u0646\u062f\u0647\u0627\u06cc \u06a9\u0645\u062a\u0631\u06cc \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u06cc \u06a9\u0646\u0646\u062f \u060c \u0648 \u0634\u0627\u062e\u0635 \u0647\u0627\u06cc \u06a9\u0627\u0645\u067e\u0648\u0632\u06cc\u062a \u0686\u0646\u062f \u06a9\u0644\u06cc\u062f \u0645\u0633\u06cc\u0631\u0647\u0627\u06cc \u062f\u0633\u062a\u0631\u0633\u06cc \u06a9\u0627\u0631\u0622\u0645\u062f \u0631\u0627 \u0627\u0631\u0627\u0626\u0647 \u0645\u06cc \u062f\u0647\u0646\u062f \u06a9\u0647 \u062a\u0645\u0627\u0645 \u0641\u06cc\u0644\u062a\u0631\u0647\u0627\u06cc \u0627\u0646\u062a\u062e\u0627\u0628\u06cc \u0631\u0627 \u067e\u0648\u0634\u0634 \u0645\u06cc \u062f\u0647\u062f. <\/p>\n<p>\u062f\u0631 \u0627\u06cc\u0646\u062c\u0627 \u0645\u062b\u0627\u0644\u06cc \u062f\u0631 PostgreSQL \u0648 MongoDB \u0622\u0648\u0631\u062f\u0647 \u0634\u062f\u0647 \u0627\u0633\u062a.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 counter-hierarchy ez-toc-counter-rtl ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u0641\u0647\u0631\u0633\u062a \u0645\u0637\u0627\u0644\u0628<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/nabfollower.com\/blog\/a-case-where-sql-joins-struggle-but-mongodb-documents-shine-11kj\/#%D9%85%D8%AF%D9%84_%D8%B1%D8%A7%D8%A8%D8%B7%D9%87_PostgreSQL\" >\u0645\u062f\u0644 \u0631\u0627\u0628\u0637\u0647 PostgreSQL<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/nabfollower.com\/blog\/a-case-where-sql-joins-struggle-but-mongodb-documents-shine-11kj\/#%D9%85%D8%AF%D9%84_%D8%B3%D9%86%D8%AF_MongoDB\" >\u0645\u062f\u0644 \u0633\u0646\u062f MongoDB<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/nabfollower.com\/blog\/a-case-where-sql-joins-struggle-but-mongodb-documents-shine-11kj\/#%D9%BE%D8%A7%DB%8C%D8%A7%D9%86\" >\u067e\u0627\u06cc\u0627\u0646<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"%D9%85%D8%AF%D9%84_%D8%B1%D8%A7%D8%A8%D8%B7%D9%87_PostgreSQL\"><\/span>\n<p>  \u0645\u062f\u0644 \u0631\u0627\u0628\u0637\u0647 PostgreSQL<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0628\u0627\u0646\u06a9\u0647\u0627\u06cc \u0627\u0637\u0644\u0627\u0639\u0627\u062a\u06cc \u0631\u0627\u0628\u0637\u0647 \u0627\u06cc \u0631\u0648\u0627\u0628\u0637 \u06cc\u06a9 \u0628\u0647 \u06cc\u06a9 \u0631\u0627 \u0628\u0647 \u062c\u062f\u0627\u0648\u0644 \u062c\u062f\u0627\u06af\u0627\u0646\u0647 \u0639\u0627\u062f\u06cc \u0645\u06cc \u06a9\u0646\u0646\u062f. \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u0645\u062b\u0627\u0644 \u060c \u0631\u0627\u0628\u0637\u0647 \u0628\u06cc\u0646 \u0633\u0641\u0627\u0631\u0634\u0627\u062a \u0648 \u062c\u0632\u0626\u06cc\u0627\u062a \u0645\u0631\u0628\u0648\u0637 \u0628\u0647 \u0633\u0641\u0627\u0631\u0634 \u0622\u0646\u0647\u0627 \u0631\u0627 \u062f\u0631 \u0646\u0638\u0631 \u0628\u06af\u06cc\u0631\u06cc\u062f \u060c \u062c\u0627\u06cc\u06cc \u06a9\u0647 \u0647\u0631 \u0633\u0641\u0627\u0631\u0634 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0686\u0646\u062f\u06cc\u0646 \u0648\u0631\u0648\u062f\u06cc \u0645\u0631\u062a\u0628\u0637 \u062f\u0631 \u062c\u062f\u0648\u0644 \u062c\u0632\u0626\u06cc\u0627\u062a \u0633\u0641\u0627\u0631\u0634 \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u062f.<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"k\">CREATE<\/span> <span class=\"k\">TABLE<\/span> <span class=\"n\">orders<\/span><span class=\"p\">(<\/span>\n  <span class=\"n\">id<\/span> <span class=\"n\">BIGSERIAL<\/span> <span class=\"k\">PRIMARY<\/span> <span class=\"k\">KEY<\/span><span class=\"p\">,<\/span>\n  <span class=\"n\">country_id<\/span> <span class=\"nb\">INT<\/span><span class=\"p\">,<\/span>\n  <span class=\"n\">created_at<\/span> <span class=\"n\">TIMESTAMPTZ<\/span> <span class=\"k\">DEFAULT<\/span> <span class=\"n\">clock_timestamp<\/span><span class=\"p\">()<\/span>\n<span class=\"p\">);<\/span>\n\n<span class=\"k\">CREATE<\/span> <span class=\"k\">TABLE<\/span> <span class=\"n\">order_details<\/span> <span class=\"p\">(<\/span>\n  <span class=\"n\">id<\/span> <span class=\"nb\">BIGINT<\/span> <span class=\"k\">REFERENCES<\/span> <span class=\"n\">orders<\/span> <span class=\"k\">ON<\/span> <span class=\"k\">DELETE<\/span> <span class=\"k\">CASCADE<\/span><span class=\"p\">,<\/span>\n  <span class=\"n\">line<\/span> <span class=\"nb\">INT<\/span><span class=\"p\">,<\/span>\n  <span class=\"n\">product_id<\/span> <span class=\"nb\">BIGINT<\/span><span class=\"p\">,<\/span>\n  <span class=\"n\">quantity<\/span> <span class=\"nb\">INT<\/span><span class=\"p\">,<\/span>\n  <span class=\"k\">PRIMARY<\/span> <span class=\"k\">KEY<\/span><span class=\"p\">(<\/span><span class=\"n\">id<\/span><span class=\"p\">,<\/span> <span class=\"n\">line<\/span><span class=\"p\">)<\/span>\n<span class=\"p\">);<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0645\u0646 \u0628\u0631\u062e\u06cc \u0627\u0632 \u062f\u0627\u062f\u0647 \u0647\u0627 \u0631\u0627 \u0628\u0627 \u062a\u0648\u0632\u06cc\u0639 \u0645\u062d\u0635\u0648\u0644\u0627\u062a\u06cc \u06a9\u0647 \u0628\u0627 \u06af\u0630\u0634\u062a \u0632\u0645\u0627\u0646 \u062f\u0631 \u0633\u0641\u0627\u0631\u0634\u0627\u062a \u06a9\u0627\u0647\u0634 \u0645\u06cc \u06cc\u0627\u0628\u062f \u060c \u0648\u0627\u0631\u062f \u0645\u06cc \u06a9\u0646\u0645:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"k\">BEGIN<\/span> <span class=\"n\">TRANSACTION<\/span><span class=\"p\">;<\/span>\n\n<span class=\"k\">INSERT<\/span> <span class=\"k\">INTO<\/span> <span class=\"n\">orders<\/span><span class=\"p\">(<\/span><span class=\"n\">country_id<\/span><span class=\"p\">)<\/span>\n <span class=\"k\">SELECT<\/span> <span class=\"mi\">10<\/span> <span class=\"o\">*<\/span> <span class=\"n\">random<\/span><span class=\"p\">()<\/span> <span class=\"k\">FROM<\/span> <span class=\"n\">generate_series<\/span><span class=\"p\">(<\/span><span class=\"mi\">1<\/span><span class=\"p\">,<\/span><span class=\"mi\">1000000<\/span><span class=\"p\">);<\/span>\n\n<span class=\"k\">INSERT<\/span> <span class=\"k\">INTO<\/span> <span class=\"n\">order_details<\/span> <span class=\"p\">(<\/span><span class=\"n\">id<\/span><span class=\"p\">,<\/span> <span class=\"n\">line<\/span><span class=\"p\">,<\/span> <span class=\"n\">product_id<\/span><span class=\"p\">,<\/span> <span class=\"n\">quantity<\/span><span class=\"p\">)<\/span>\n <span class=\"k\">SELECT<\/span> \n  <span class=\"n\">id<\/span><span class=\"p\">,<\/span>\n  <span class=\"n\">generate_series<\/span><span class=\"p\">(<\/span><span class=\"mi\">1<\/span><span class=\"p\">,<\/span><span class=\"mi\">10<\/span><span class=\"p\">),<\/span>\n  <span class=\"n\">log<\/span><span class=\"p\">(<\/span><span class=\"mi\">2<\/span><span class=\"p\">,(<\/span><span class=\"mi\">1<\/span> <span class=\"o\">+<\/span> <span class=\"n\">id<\/span> <span class=\"o\">*<\/span> <span class=\"n\">random<\/span><span class=\"p\">())::<\/span><span class=\"nb\">int<\/span><span class=\"p\">),<\/span>\n  <span class=\"mi\">100<\/span> <span class=\"o\">*<\/span> <span class=\"n\">random<\/span><span class=\"p\">()<\/span>\n  <span class=\"k\">FROM<\/span> <span class=\"n\">orders<\/span><span class=\"p\">;<\/span>\n\n<span class=\"k\">COMMIT<\/span><span class=\"p\">;<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u06cc\u06a9 \u0645\u062f\u0644 \u062f\u0627\u062f\u0647 \u0631\u0627\u0628\u0637\u0647 \u0627\u06cc \u0628\u0647 \u0627\u0644\u06af\u0648\u0647\u0627\u06cc \u062f\u0633\u062a\u0631\u0633\u06cc \u062e\u0627\u0635 \u0628\u0633\u062a\u06af\u06cc \u0646\u062f\u0627\u0631\u062f. \u0628\u0647\u06cc\u0646\u0647 \u0633\u0627\u0632\u06cc \u0627\u06cc\u0646 \u0627\u0644\u06af\u0648\u0647\u0627\u06cc \u0646\u06cc\u0627\u0632 \u0628\u0647 \u0634\u0627\u062e\u0635 \u062f\u0627\u0631\u062f. \u06a9\u0644\u06cc\u062f\u0647\u0627\u06cc \u0627\u0635\u0644\u06cc \u0645\u0646 \u0634\u0627\u062e\u0635 \u0647\u0627\u06cc \u062a\u0639\u0631\u06cc\u0641 \u0634\u062f\u0647 \u0628\u0631\u0627\u06cc \u067e\u06cc\u0645\u0627\u06cc\u0634 \u0628\u06cc\u0646 \u0633\u0641\u0627\u0631\u0634\u0627\u062a \u0648 \u062c\u0632\u0626\u06cc\u0627\u062a \u0633\u0641\u0627\u0631\u0634 \u0631\u0627 \u062a\u0639\u0631\u06cc\u0641 \u0645\u06cc \u06a9\u0646\u0646\u062f \u060c \u0627\u0645\u0627 \u0645\u0646 \u0645\u0648\u0631\u062f \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u062f\u06cc\u06af\u0631\u06cc \u062f\u0627\u0631\u0645.<br \/>\u0628\u0631\u0627\u06cc \u062a\u062c\u0632\u06cc\u0647 \u0648 \u062a\u062d\u0644\u06cc\u0644 \u0633\u0641\u0627\u0631\u0634\u0627\u062a \u06a9\u0634\u0648\u0631 \u060c \u0645\u062d\u0635\u0648\u0644 \u0648 \u0645\u062d\u062f\u0648\u062f\u0647 \u062a\u0627\u0631\u06cc\u062e \u060c \u0645\u0646 \u0634\u0627\u062e\u0635 \u0647\u0627\u06cc \u0632\u06cc\u0631 \u0631\u0627 \u0627\u06cc\u062c\u0627\u062f \u0645\u06cc \u06a9\u0646\u0645:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code>\n<span class=\"k\">CREATE<\/span> <span class=\"k\">INDEX<\/span> <span class=\"k\">ON<\/span> <span class=\"n\">orders<\/span> <span class=\"p\">(<\/span><span class=\"n\">country_id<\/span><span class=\"p\">,<\/span> <span class=\"n\">created_at<\/span> <span class=\"k\">DESC<\/span><span class=\"p\">,<\/span> <span class=\"n\">id<\/span><span class=\"p\">);<\/span>\n\n<span class=\"k\">CREATE<\/span> <span class=\"k\">INDEX<\/span> <span class=\"k\">ON<\/span> <span class=\"n\">order_details<\/span> <span class=\"p\">(<\/span><span class=\"n\">product_id<\/span><span class=\"p\">,<\/span> <span class=\"n\">id<\/span><span class=\"p\">);<\/span>\n\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0628\u0631\u0627\u06cc \u062a\u062c\u0632\u06cc\u0647 \u0648 \u062a\u062d\u0644\u06cc\u0644 \u0622\u062e\u0631\u06cc\u0646 \u0633\u0641\u0627\u0631\u0634\u0627\u062a \u0628\u0631\u0627\u06cc \u06cc\u06a9 \u06a9\u0634\u0648\u0631 \u0648 \u0645\u062d\u0635\u0648\u0644 \u062e\u0627\u0635 \u060c \u0645\u0646 \u0627\u0632 \u067e\u0631\u0633 \u0648 \u062c\u0648 SQL \u0632\u06cc\u0631 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u06cc \u06a9\u0646\u0645:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code>\n<span class=\"k\">PREPARE<\/span> <span class=\"n\">query<\/span><span class=\"p\">(<\/span><span class=\"nb\">int<\/span><span class=\"p\">,<\/span><span class=\"nb\">int<\/span><span class=\"p\">,<\/span><span class=\"nb\">int<\/span><span class=\"p\">)<\/span> <span class=\"k\">AS<\/span>\n <span class=\"k\">SELECT<\/span> <span class=\"n\">id<\/span><span class=\"p\">,<\/span> <span class=\"n\">created_at<\/span><span class=\"p\">,<\/span> <span class=\"n\">product_id<\/span><span class=\"p\">,<\/span> <span class=\"n\">quantity<\/span>\n <span class=\"k\">FROM<\/span> <span class=\"n\">orders<\/span>\n <span class=\"k\">JOIN<\/span> <span class=\"n\">order_details<\/span> <span class=\"n\">d<\/span> <span class=\"k\">USING<\/span><span class=\"p\">(<\/span><span class=\"n\">id<\/span><span class=\"p\">)<\/span>\n <span class=\"k\">WHERE<\/span> <span class=\"n\">country_id<\/span><span class=\"o\">=<\/span><span class=\"err\">$<\/span><span class=\"mi\">1<\/span> <span class=\"k\">AND<\/span> <span class=\"n\">product_id<\/span><span class=\"o\">=<\/span><span class=\"err\">$<\/span><span class=\"mi\">2<\/span>\n <span class=\"k\">ORDER<\/span> <span class=\"k\">BY<\/span> <span class=\"n\">created_at<\/span> <span class=\"k\">DESC<\/span> <span class=\"k\">LIMIT<\/span> <span class=\"err\">$<\/span><span class=\"mi\">3<\/span>\n<span class=\"p\">;<\/span>\n\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0645\u0646 \u062e\u0644\u0627\u0621 \u0645\u06cc \u06a9\u0646\u0645 \u0648 \u062a\u062c\u0632\u06cc\u0647 \u0648 \u062a\u062d\u0644\u06cc\u0644 \u0645\u06cc \u06a9\u0646\u0645 \u062a\u0627 \u0628\u0647\u062a\u0631\u06cc\u0646 \u0628\u0631\u0646\u0627\u0645\u0647 \u0627\u0639\u062f\u0627\u0645 \u0631\u0627 \u0628\u062f\u0633\u062a \u0622\u0648\u0631\u0645:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"n\">postgres<\/span><span class=\"o\">=#<\/span> <span class=\"k\">VACUUM<\/span> <span class=\"k\">ANALYZE<\/span> <span class=\"n\">orders<\/span><span class=\"p\">,<\/span> <span class=\"n\">order_details<\/span><span class=\"p\">;<\/span>\n<span class=\"k\">VACUUM<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u062f\u0631 \u062d\u0627\u0644\u062a \u0627\u06cc\u062f\u0647 \u0622\u0644 \u060c \u0686\u0646\u06cc\u0646 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0628\u0627\u06cc\u062f \u0641\u0642\u0637 \u0631\u062f\u06cc\u0641 \u0647\u0627\u06cc \u06cc\u06a9 \u06a9\u0634\u0648\u0631 \u0648 \u06cc\u06a9 \u0645\u062d\u0635\u0648\u0644 \u0631\u0627 \u0628\u062e\u0648\u0627\u0646\u06cc\u062f \u0648 \u0622\u0646\u0647\u0627 \u0631\u0627 \u0628\u0647 \u062a\u0627\u0631\u06cc\u062e \u0633\u0641\u0627\u0631\u0634 \u062f\u0647\u06cc\u062f \u062a\u0627 \u0628\u062f\u0648\u0646 \u0646\u06cc\u0627\u0632 \u0628\u0647 \u062e\u0648\u0627\u0646\u062f\u0646 \u0647\u0645\u0647 \u0631\u062f\u06cc\u0641 \u0647\u0627 \u0648 \u0645\u0631\u062a\u0628 \u0633\u0627\u0632\u06cc \u0622\u0646\u0647\u0627 \u060c \u0633\u0641\u0627\u0631\u0634 TOP-N \u0631\u0627 \u0628\u0627 \u0645\u062d\u062f\u0648\u062f\u06cc\u062a \u0627\u0639\u0645\u0627\u0644 \u06a9\u0646\u0646\u062f.<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"n\">postgres<\/span><span class=\"o\">=#<\/span> <span class=\"k\">EXPLAIN<\/span> <span class=\"p\">(<\/span><span class=\"k\">analyze<\/span><span class=\"p\">,<\/span> <span class=\"n\">buffers<\/span><span class=\"p\">,<\/span> <span class=\"n\">costs<\/span> <span class=\"k\">off<\/span><span class=\"p\">)<\/span>\n           <span class=\"k\">EXECUTE<\/span> <span class=\"n\">query<\/span><span class=\"p\">(<\/span><span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"mi\">15<\/span><span class=\"p\">,<\/span> <span class=\"mi\">10<\/span><span class=\"p\">)<\/span>\n<span class=\"p\">;<\/span>\n                                                                                                                                                                                                 <span class=\"n\">QUERY<\/span> <span class=\"n\">PLAN<\/span>                                                         \n<span class=\"c1\">----------------------------------------------------------------------------------------------------------------------------<\/span>\n <span class=\"k\">Limit<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">031<\/span><span class=\"p\">..<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">110<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">10<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n   <span class=\"n\">Buffers<\/span><span class=\"p\">:<\/span> <span class=\"n\">shared<\/span> <span class=\"n\">hit<\/span><span class=\"o\">=<\/span><span class=\"mi\">132<\/span>\n   <span class=\"o\">-&gt;<\/span>  <span class=\"n\">Nested<\/span> <span class=\"n\">Loop<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">030<\/span><span class=\"p\">..<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">108<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">10<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n         <span class=\"n\">Buffers<\/span><span class=\"p\">:<\/span> <span class=\"n\">shared<\/span> <span class=\"n\">hit<\/span><span class=\"o\">=<\/span><span class=\"mi\">132<\/span>\n         <span class=\"o\">-&gt;<\/span>  <span class=\"k\">Index<\/span> <span class=\"k\">Only<\/span> <span class=\"n\">Scan<\/span> <span class=\"k\">using<\/span> <span class=\"n\">orders_country_id_created_at_id_idx<\/span> <span class=\"k\">on<\/span> <span class=\"n\">orders<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">011<\/span><span class=\"p\">..<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">023<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">39<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n               <span class=\"k\">Index<\/span> <span class=\"n\">Cond<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"n\">country_id<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n               <span class=\"n\">Heap<\/span> <span class=\"n\">Fetches<\/span><span class=\"p\">:<\/span> <span class=\"mi\">0<\/span>\n               <span class=\"n\">Buffers<\/span><span class=\"p\">:<\/span> <span class=\"n\">shared<\/span> <span class=\"n\">hit<\/span><span class=\"o\">=<\/span><span class=\"mi\">5<\/span>\n         <span class=\"o\">-&gt;<\/span>  <span class=\"k\">Index<\/span> <span class=\"n\">Scan<\/span> <span class=\"k\">using<\/span> <span class=\"n\">order_details_product_id_id_idx<\/span> <span class=\"k\">on<\/span> <span class=\"n\">order_details<\/span> <span class=\"n\">d<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">002<\/span><span class=\"p\">..<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">002<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">0<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">39<\/span><span class=\"p\">)<\/span>\n               <span class=\"k\">Index<\/span> <span class=\"n\">Cond<\/span><span class=\"p\">:<\/span> <span class=\"p\">((<\/span><span class=\"n\">product_id<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">15<\/span><span class=\"p\">)<\/span> <span class=\"k\">AND<\/span> <span class=\"p\">(<\/span><span class=\"n\">id<\/span> <span class=\"o\">=<\/span> <span class=\"n\">orders<\/span><span class=\"p\">.<\/span><span class=\"n\">id<\/span><span class=\"p\">))<\/span>\n               <span class=\"n\">Buffers<\/span><span class=\"p\">:<\/span> <span class=\"n\">shared<\/span> <span class=\"n\">hit<\/span><span class=\"o\">=<\/span><span class=\"mi\">127<\/span>\n <span class=\"n\">Planning<\/span><span class=\"p\">:<\/span>\n   <span class=\"n\">Buffers<\/span><span class=\"p\">:<\/span> <span class=\"n\">shared<\/span> <span class=\"n\">hit<\/span><span class=\"o\">=<\/span><span class=\"mi\">16<\/span>\n <span class=\"n\">Planning<\/span> <span class=\"nb\">Time<\/span><span class=\"p\">:<\/span> <span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">272<\/span> <span class=\"n\">ms<\/span>\n <span class=\"n\">Execution<\/span> <span class=\"nb\">Time<\/span><span class=\"p\">:<\/span> <span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">127<\/span> <span class=\"n\">ms<\/span>\n<span class=\"p\">(<\/span><span class=\"mi\">15<\/span> <span class=\"k\">rows<\/span><span class=\"p\">)<\/span>\n\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0628\u0631\u0646\u0627\u0645\u0647 \u0627\u0639\u062f\u0627\u0645 \u0645\u0624\u062b\u0631 \u0627\u0633\u062a \u060c \u0628\u0627 \u0634\u0631\u0648\u0639 \u0634\u0627\u062e\u0635 \u0631\u0648\u0634\u0646 <code>orders.created_at<\/code> \u0628\u0631\u0627\u06cc \u0627\u0632 \u0628\u06cc\u0646 \u0628\u0631\u062f\u0646 \u0646\u06cc\u0627\u0632 \u0628\u0647 \u0645\u0631\u062a\u0628 \u0633\u0627\u0632\u06cc. \u0628\u0631\u0627\u06cc \u062d\u0641\u0638 \u0633\u0641\u0627\u0631\u0634 \u0648 \u0641\u0634\u0627\u0631 \u062f\u0627\u062f\u0646 \u0641\u06cc\u0644\u062a\u0631 \u067e\u06cc\u0648\u0633\u062a \u060c \u0627\u0632 \u06cc\u06a9 \u062d\u0644\u0642\u0647 \u062a\u0648 \u062f\u0631 \u062a\u0648 \u062f\u0631 \u062a\u0648\u062e\u0627\u0644\u06cc \u0628\u0631\u0627\u06cc \u0628\u0627\u0632\u06cc\u0627\u0628\u06cc \u0631\u062f\u06cc\u0641 \u0647\u0627 \u0627\u0632 \u062c\u062f\u0648\u0644 \u062f\u06cc\u06af\u0631 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u06cc \u06a9\u0646\u062f.<br \/>\u0627\u0632 \u0622\u0646\u062c\u0627 \u06a9\u0647 \u0641\u06cc\u0644\u062a\u0631 \u062f\u06cc\u06af\u0631\u06cc \u0648\u062c\u0648\u062f \u062f\u0627\u0631\u062f <code>order_details.product_id<\/code>\u060c \u067e\u0633 \u0627\u0632 \u067e\u06cc\u0648\u0633\u062a\u0646 \u060c \u0645\u062c\u0628\u0648\u0631 \u0634\u062f \u0631\u062f\u06cc\u0641 \u0647\u0627\u06cc \u0628\u06cc\u0634\u062a\u0631\u06cc \u0631\u0627 \u0628\u062e\u0648\u0627\u0646\u062f (<code>rows=39<\/code>) \u0628\u0631\u0627\u06cc \u0628\u0647 \u062f\u0633\u062a \u0622\u0648\u0631\u062f\u0646 \u0631\u062f\u06cc\u0641 \u0647\u0627\u06cc \u0645\u0648\u0631\u062f \u0646\u06cc\u0627\u0632 \u0646\u0647\u0627\u06cc\u06cc (<code>rows=10<\/code>) \u060c \u0648 \u0633\u067e\u0633 \u062d\u0644\u0642\u0647 \u0647\u0627\u06cc \u0628\u06cc\u0634\u062a\u0631. \u0627\u0632 \u0622\u0646\u062c\u0627 \u06a9\u0647 \u0645\u062b\u0627\u0644 \u0645\u0646 \u06a9\u0648\u0686\u06a9 \u0627\u0633\u062a \u060c \u0646\u062a\u06cc\u062c\u0647 \u0627\u0632 \u0646\u0638\u0631 \u0632\u0645\u0627\u0646 \u062d\u062f\u0627\u0642\u0644 \u060c \u062d\u0644\u0642\u0647 \u0647\u0627\u06cc \u062a\u0648 \u062f\u0631 \u062a\u0648 \u0627\u0633\u062a (<code>loops=39<\/code>) \u0648 \u0628\u0627\u0641\u0631 (<code>shared hit=127<\/code>) \u060c \u0627\u0645\u0627 \u0645\u0633\u0626\u0644\u0647 \u0631\u0627 \u0628\u0631\u062c\u0633\u062a\u0647 \u0645\u06cc \u06a9\u0646\u062f: \u0628\u0631\u0627\u06cc \u0628\u0627\u0632\u06af\u0634\u062a \u0646\u062a\u0627\u06cc\u062c \u0628\u0647 \u0686\u0647\u0627\u0631 \u0631\u062f\u06cc\u0641 \u0648 \u062f\u0647 \u0635\u0641\u062d\u0647 \u0628\u0631\u0627\u06cc \u0647\u0631 \u0631\u062f\u06cc\u0641 \u0646\u06cc\u0627\u0632 \u062f\u0627\u0631\u062f.<\/p>\n<p>\u0627\u06af\u0631 \u0645\u0646 \u0647\u0645\u0627\u0646 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0631\u0627 \u0628\u0627 \u0645\u062d\u0635\u0648\u0644 \u062f\u06cc\u06af\u0631\u06cc \u06a9\u0647 \u0627\u062e\u06cc\u0631\u0627\u064b \u0633\u0641\u0627\u0631\u0634 \u062f\u0627\u062f\u0647 \u0646\u0634\u062f\u0647 \u0627\u0633\u062a \u0627\u062c\u0631\u0627 \u06a9\u0646\u0645 \u060c \u0642\u0628\u0644 \u0627\u0632 \u06cc\u0627\u0641\u062a\u0646 \u062f\u0647 \u0645\u0648\u0631\u062f \u06a9\u0647 \u0634\u0627\u0645\u0644 \u0627\u06cc\u0646 \u0645\u062d\u0635\u0648\u0644 \u0627\u0633\u062a \u060c \u0633\u0641\u0627\u0631\u0634\u0627\u062a \u0632\u06cc\u0627\u062f\u06cc \u0631\u0627 \u0645\u06cc \u062e\u0648\u0627\u0646\u062f:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"n\">postgres<\/span><span class=\"o\">=#<\/span> <span class=\"k\">EXPLAIN<\/span> <span class=\"p\">(<\/span><span class=\"k\">analyze<\/span><span class=\"p\">,<\/span> <span class=\"n\">buffers<\/span><span class=\"p\">,<\/span> <span class=\"n\">costs<\/span> <span class=\"k\">off<\/span><span class=\"p\">)<\/span>\n           <span class=\"k\">EXECUTE<\/span> <span class=\"n\">query<\/span><span class=\"p\">(<\/span><span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"mi\">8<\/span><span class=\"p\">,<\/span> <span class=\"mi\">10<\/span><span class=\"p\">)<\/span>\n<span class=\"p\">;<\/span>\n                                                                 <span class=\"n\">QUERY<\/span> <span class=\"n\">PLAN<\/span>                                                                  \n<span class=\"c1\">---------------------------------------------------------------------------------------------------------------------------------------------<\/span>\n <span class=\"k\">Limit<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">15<\/span><span class=\"p\">.<\/span><span class=\"mi\">614<\/span><span class=\"p\">..<\/span><span class=\"mi\">16<\/span><span class=\"p\">.<\/span><span class=\"mi\">661<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">10<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n   <span class=\"n\">Buffers<\/span><span class=\"p\">:<\/span> <span class=\"n\">shared<\/span> <span class=\"n\">hit<\/span><span class=\"o\">=<\/span><span class=\"mi\">37582<\/span>\n   <span class=\"o\">-&gt;<\/span>  <span class=\"n\">Gather<\/span> <span class=\"n\">Merge<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">15<\/span><span class=\"p\">.<\/span><span class=\"mi\">613<\/span><span class=\"p\">..<\/span><span class=\"mi\">16<\/span><span class=\"p\">.<\/span><span class=\"mi\">659<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">10<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n         <span class=\"n\">Workers<\/span> <span class=\"n\">Planned<\/span><span class=\"p\">:<\/span> <span class=\"mi\">2<\/span>\n         <span class=\"n\">Workers<\/span> <span class=\"n\">Launched<\/span><span class=\"p\">:<\/span> <span class=\"mi\">2<\/span>\n         <span class=\"n\">Buffers<\/span><span class=\"p\">:<\/span> <span class=\"n\">shared<\/span> <span class=\"n\">hit<\/span><span class=\"o\">=<\/span><span class=\"mi\">37582<\/span>\n         <span class=\"o\">-&gt;<\/span>  <span class=\"n\">Nested<\/span> <span class=\"n\">Loop<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">.<\/span><span class=\"mi\">396<\/span><span class=\"p\">..<\/span><span class=\"mi\">9<\/span><span class=\"p\">.<\/span><span class=\"mi\">112<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">7<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">3<\/span><span class=\"p\">)<\/span>\n               <span class=\"n\">Buffers<\/span><span class=\"p\">:<\/span> <span class=\"n\">shared<\/span> <span class=\"n\">hit<\/span><span class=\"o\">=<\/span><span class=\"mi\">37582<\/span>\n               <span class=\"o\">-&gt;<\/span>  <span class=\"n\">Parallel<\/span> <span class=\"k\">Index<\/span> <span class=\"k\">Only<\/span> <span class=\"n\">Scan<\/span> <span class=\"k\">using<\/span> <span class=\"n\">orders_country_id_created_at_id_idx<\/span> <span class=\"k\">on<\/span> <span class=\"n\">orders<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">015<\/span><span class=\"p\">..<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">546<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">4165<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">3<\/span><span class=\"p\">)<\/span>\n                     <span class=\"k\">Index<\/span> <span class=\"n\">Cond<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"n\">country_id<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n                     <span class=\"n\">Heap<\/span> <span class=\"n\">Fetches<\/span><span class=\"p\">:<\/span> <span class=\"mi\">0<\/span>\n                     <span class=\"n\">Buffers<\/span><span class=\"p\">:<\/span> <span class=\"n\">shared<\/span> <span class=\"n\">hit<\/span><span class=\"o\">=<\/span><span class=\"mi\">70<\/span>\n               <span class=\"o\">-&gt;<\/span>  <span class=\"k\">Index<\/span> <span class=\"n\">Scan<\/span> <span class=\"k\">using<\/span> <span class=\"n\">order_details_product_id_id_idx<\/span> <span class=\"k\">on<\/span> <span class=\"n\">order_details<\/span> <span class=\"n\">d<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">002<\/span><span class=\"p\">..<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">002<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">0<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">12494<\/span><span class=\"p\">)<\/span>\n                     <span class=\"k\">Index<\/span> <span class=\"n\">Cond<\/span><span class=\"p\">:<\/span> <span class=\"p\">((<\/span><span class=\"n\">product_id<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">8<\/span><span class=\"p\">)<\/span> <span class=\"k\">AND<\/span> <span class=\"p\">(<\/span><span class=\"n\">id<\/span> <span class=\"o\">=<\/span> <span class=\"n\">orders<\/span><span class=\"p\">.<\/span><span class=\"n\">id<\/span><span class=\"p\">))<\/span>\n                     <span class=\"n\">Buffers<\/span><span class=\"p\">:<\/span> <span class=\"n\">shared<\/span> <span class=\"n\">hit<\/span><span class=\"o\">=<\/span><span class=\"mi\">37512<\/span>\n <span class=\"n\">Planning<\/span><span class=\"p\">:<\/span>\n   <span class=\"n\">Buffers<\/span><span class=\"p\">:<\/span> <span class=\"n\">shared<\/span> <span class=\"n\">hit<\/span><span class=\"o\">=<\/span><span class=\"mi\">16<\/span>\n <span class=\"n\">Planning<\/span> <span class=\"nb\">Time<\/span><span class=\"p\">:<\/span> <span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">272<\/span> <span class=\"n\">ms<\/span>\n <span class=\"n\">Execution<\/span> <span class=\"nb\">Time<\/span><span class=\"p\">:<\/span> <span class=\"mi\">16<\/span><span class=\"p\">.<\/span><span class=\"mi\">684<\/span> <span class=\"n\">ms<\/span>\n<span class=\"p\">(<\/span><span class=\"mi\">19<\/span> <span class=\"k\">rows<\/span><span class=\"p\">)<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0628\u0631\u0627\u06cc \u0628\u0647 \u062f\u0633\u062a \u0622\u0648\u0631\u062f\u0646 \u0646\u062a\u06cc\u062c\u0647 10 \u0631\u062f\u06cc\u0641 \u060c \u0627\u06cc\u0646 \u0627\u0639\u062f\u0627\u0645 12495 \u0631\u062f\u06cc\u0641 \u0628\u0627 3 \u0641\u0631\u0622\u06cc\u0646\u062f \u0645\u0648\u0627\u0632\u06cc (\u0631\u062f\u06cc\u0641 = 4165 \u062d\u0644\u0642\u0647 = 3) \u0648 \u062f\u0631 \u06a9\u0644 37582 \u0635\u0641\u062d\u0647 \u062e\u0648\u0627\u0646\u062f\u0647 \u0627\u0633\u062a \u060c \u0642\u0628\u0644 \u0627\u0632 \u0622\u0646\u06a9\u0647 \u0646\u062a\u0648\u0627\u0646\u062f Top-10 \u0631\u0627 \u067e\u06cc\u062f\u0627 \u06a9\u0646\u062f \u06a9\u0647 \u0647\u0645\u0647 \u0641\u06cc\u0644\u062a\u0631\u0647\u0627 \u0631\u0627 \u062a\u0623\u06cc\u06cc\u062f \u06a9\u0646\u062f. <\/p>\n<p>\u0645\u0634\u06a9\u0644 \u0627\u06cc\u0646 \u0627\u0633\u062a \u06a9\u0647 \u06a9\u0627\u0631\u0628\u0631 \u0646\u0645\u06cc \u0641\u0647\u0645\u062f \u06a9\u0647 \u0686\u0631\u0627 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0637\u0648\u0644\u0627\u0646\u06cc \u062a\u0631 \u0634\u0648\u062f \u060c \u0632\u06cc\u0631\u0627 \u0647\u0645\u0627\u0646 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0627\u0633\u062a \u0648 \u0628\u0647 \u0647\u0645\u0627\u0646 \u062a\u0639\u062f\u0627\u062f \u0631\u062f\u06cc\u0641 \u0647\u0627 \u0628\u0631\u0645\u06cc \u06af\u0631\u062f\u062f. \u0639\u0644\u0627\u0648\u0647 \u0628\u0631 \u0627\u06cc\u0646 \u060c \u062e\u0648\u0627\u0646\u062f\u0646 \u0628\u0633\u06cc\u0627\u0631\u06cc \u0627\u0632 \u0635\u0641\u062d\u0627\u062a \u063a\u06cc\u0631 \u0636\u0631\u0648\u0631\u06cc \u0628\u0631 \u0633\u0627\u06cc\u0631 \u0633\u0624\u0627\u0644\u0627\u062a \u062a\u0623\u062b\u06cc\u0631 \u0645\u06cc \u06af\u0630\u0627\u0631\u062f \u0632\u06cc\u0631\u0627 \u0641\u0636\u0627\u06cc \u0645\u0648\u062c\u0648\u062f \u062f\u0631 \u0628\u0627\u0641\u0631 \u0645\u0634\u062a\u0631\u06a9 \u0631\u0627 \u0627\u0634\u063a\u0627\u0644 \u0645\u06cc \u06a9\u0646\u062f.<\/p>\n<p>\u0647\u0646\u06af\u0627\u0645\u06cc \u06a9\u0647 \u0628\u0631\u0646\u0627\u0645\u0647 \u0631\u06cc\u0632 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u062a\u062e\u0645\u06cc\u0646 \u0645\u06cc \u0632\u0646\u062f \u06a9\u0647 \u0627\u06cc\u0646 \u0628\u06cc\u0634 \u0627\u0632 \u062d\u062f \u0627\u0633\u062a \u060c \u062a\u0635\u0645\u06cc\u0645 \u0646\u0645\u06cc \u06af\u06cc\u0631\u062f \u06a9\u0647 \u0627\u0632 \u0645\u0631\u062a\u0628 \u0633\u0627\u0632\u06cc \u062e\u0648\u062f\u062f\u0627\u0631\u06cc \u06a9\u0646\u062f \u0648 \u0628\u0647 \u06cc\u06a9 \u0647\u0634 \u0647\u0634 \u0633\u0648\u0626\u06cc\u0686 \u0645\u06cc \u06a9\u0646\u062f.<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code>\n<span class=\"n\">postgres<\/span><span class=\"o\">=#<\/span> <span class=\"k\">EXPLAIN<\/span> <span class=\"p\">(<\/span><span class=\"k\">analyze<\/span><span class=\"p\">,<\/span> <span class=\"n\">buffers<\/span><span class=\"p\">,<\/span> <span class=\"n\">costs<\/span> <span class=\"k\">off<\/span><span class=\"p\">)<\/span>\n           <span class=\"k\">EXECUTE<\/span> <span class=\"n\">query<\/span><span class=\"p\">(<\/span><span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"mi\">5<\/span><span class=\"p\">,<\/span> <span class=\"mi\">10<\/span><span class=\"p\">)<\/span>\n<span class=\"p\">;<\/span>\n                                                                 <span class=\"n\">QUERY<\/span> <span class=\"n\">PLAN<\/span>                                                                                                      \n<span class=\"c1\">--------------------------------------------------------------------------------------------------------------------------------------------                                     <\/span>\n <span class=\"k\">Limit<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">30<\/span><span class=\"p\">.<\/span><span class=\"mi\">370<\/span><span class=\"p\">..<\/span><span class=\"mi\">30<\/span><span class=\"p\">.<\/span><span class=\"mi\">373<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">10<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n   <span class=\"n\">Buffers<\/span><span class=\"p\">:<\/span> <span class=\"n\">shared<\/span> <span class=\"n\">hit<\/span><span class=\"o\">=<\/span><span class=\"mi\">1882<\/span>\n   <span class=\"o\">-&gt;<\/span>  <span class=\"n\">Sort<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">30<\/span><span class=\"p\">.<\/span><span class=\"mi\">369<\/span><span class=\"p\">..<\/span><span class=\"mi\">30<\/span><span class=\"p\">.<\/span><span class=\"mi\">371<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">10<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n         <span class=\"n\">Sort<\/span> <span class=\"k\">Key<\/span><span class=\"p\">:<\/span> <span class=\"n\">orders<\/span><span class=\"p\">.<\/span><span class=\"n\">created_at<\/span> <span class=\"k\">DESC<\/span>\n         <span class=\"n\">Sort<\/span> <span class=\"k\">Method<\/span><span class=\"p\">:<\/span> <span class=\"n\">top<\/span><span class=\"o\">-<\/span><span class=\"n\">N<\/span> <span class=\"n\">heapsort<\/span>  <span class=\"n\">Memory<\/span><span class=\"p\">:<\/span> <span class=\"mi\">26<\/span><span class=\"n\">kB<\/span>\n         <span class=\"n\">Buffers<\/span><span class=\"p\">:<\/span> <span class=\"n\">shared<\/span> <span class=\"n\">hit<\/span><span class=\"o\">=<\/span><span class=\"mi\">1882<\/span>\n         <span class=\"o\">-&gt;<\/span>  <span class=\"n\">Hash<\/span> <span class=\"k\">Join<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">28<\/span><span class=\"p\">.<\/span><span class=\"mi\">466<\/span><span class=\"p\">..<\/span><span class=\"mi\">30<\/span><span class=\"p\">.<\/span><span class=\"mi\">324<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">236<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n               <span class=\"n\">Hash<\/span> <span class=\"n\">Cond<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"n\">d<\/span><span class=\"p\">.<\/span><span class=\"n\">id<\/span> <span class=\"o\">=<\/span> <span class=\"n\">orders<\/span><span class=\"p\">.<\/span><span class=\"n\">id<\/span><span class=\"p\">)<\/span>\n               <span class=\"n\">Buffers<\/span><span class=\"p\">:<\/span> <span class=\"n\">shared<\/span> <span class=\"n\">hit<\/span><span class=\"o\">=<\/span><span class=\"mi\">1882<\/span>\n               <span class=\"o\">-&gt;<\/span>  <span class=\"k\">Index<\/span> <span class=\"n\">Scan<\/span> <span class=\"k\">using<\/span> <span class=\"n\">order_details_product_id_id_idx<\/span> <span class=\"k\">on<\/span> <span class=\"n\">order_details<\/span> <span class=\"n\">d<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">013<\/span><span class=\"p\">..<\/span><span class=\"mi\">1<\/span><span class=\"p\">.<\/span><span class=\"mi\">434<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">2311<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>                                              \n                     <span class=\"k\">Index<\/span> <span class=\"n\">Cond<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"n\">product_id<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">5<\/span><span class=\"p\">)<\/span>\n                     <span class=\"n\">Buffers<\/span><span class=\"p\">:<\/span> <span class=\"n\">shared<\/span> <span class=\"n\">hit<\/span><span class=\"o\">=<\/span><span class=\"mi\">1387<\/span>\n               <span class=\"o\">-&gt;<\/span>  <span class=\"n\">Hash<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">28<\/span><span class=\"p\">.<\/span><span class=\"mi\">400<\/span><span class=\"p\">..<\/span><span class=\"mi\">28<\/span><span class=\"p\">.<\/span><span class=\"mi\">401<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">99672<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n                     <span class=\"n\">Buckets<\/span><span class=\"p\">:<\/span> <span class=\"mi\">131072<\/span>  <span class=\"n\">Batches<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span>  <span class=\"n\">Memory<\/span> <span class=\"k\">Usage<\/span><span class=\"p\">:<\/span> <span class=\"mi\">5697<\/span><span class=\"n\">kB<\/span>\n                     <span class=\"n\">Buffers<\/span><span class=\"p\">:<\/span> <span class=\"n\">shared<\/span> <span class=\"n\">hit<\/span><span class=\"o\">=<\/span><span class=\"mi\">495<\/span>\n                     <span class=\"o\">-&gt;<\/span>  <span class=\"k\">Index<\/span> <span class=\"k\">Only<\/span> <span class=\"n\">Scan<\/span> <span class=\"k\">using<\/span> <span class=\"n\">orders_country_id_created_at_id_idx<\/span> <span class=\"k\">on<\/span> <span class=\"n\">orders<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">010<\/span><span class=\"p\">..<\/span><span class=\"mi\">13<\/span><span class=\"p\">.<\/span><span class=\"mi\">136<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">99672<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>                                      \n                           <span class=\"k\">Index<\/span> <span class=\"n\">Cond<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"n\">country_id<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n                           <span class=\"n\">Heap<\/span> <span class=\"n\">Fetches<\/span><span class=\"p\">:<\/span> <span class=\"mi\">0<\/span>\n                           <span class=\"n\">Buffers<\/span><span class=\"p\">:<\/span> <span class=\"n\">shared<\/span> <span class=\"n\">hit<\/span><span class=\"o\">=<\/span><span class=\"mi\">495<\/span>\n <span class=\"n\">Planning<\/span><span class=\"p\">:<\/span>\n   <span class=\"n\">Buffers<\/span><span class=\"p\">:<\/span> <span class=\"n\">shared<\/span> <span class=\"n\">hit<\/span><span class=\"o\">=<\/span><span class=\"mi\">16<\/span>\n <span class=\"n\">Planning<\/span> <span class=\"nb\">Time<\/span><span class=\"p\">:<\/span> <span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">267<\/span> <span class=\"n\">ms<\/span>\n <span class=\"n\">Execution<\/span> <span class=\"nb\">Time<\/span><span class=\"p\">:<\/span> <span class=\"mi\">30<\/span><span class=\"p\">.<\/span><span class=\"mi\">415<\/span> <span class=\"n\">ms<\/span>\n<span class=\"p\">(<\/span><span class=\"mi\">23<\/span> <span class=\"k\">rows<\/span><span class=\"p\">)<\/span>\n\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0627\u06cc\u0646 \u0637\u0631\u062d \u0628\u0647 \u0627\u0646\u062f\u0627\u0632\u0647 \u0646\u062a\u06cc\u062c\u0647 \u0628\u0633\u062a\u06af\u06cc \u0646\u062f\u0627\u0631\u062f \u0627\u0645\u0627 \u0628\u0627\u06cc\u062f \u0631\u062f\u06cc\u0641 \u0647\u0627\u06cc \u0632\u06cc\u0627\u062f\u06cc \u0631\u0627 \u0628\u062e\u0648\u0627\u0646\u06cc\u062f (<code>rows=2311<\/code> \u0648\u062a <code>rows=99672<\/code>) \u0642\u0628\u0644 \u0627\u0632 \u067e\u06cc\u0648\u0633\u062a\u0646 \u060c \u0641\u06cc\u0644\u062a\u0631 \u06a9\u0631\u062f\u0646 \u0622\u0646\u0647\u0627 (\u0628\u0647 <code>rows=236<\/code>) \u060c \u0648 \u0645\u0631\u062a\u0628 \u0633\u0627\u0632\u06cc \u0622\u0646\u0647\u0627. \u0627\u06cc\u0646 \u062c\u0627\u06cc\u06cc \u0627\u0633\u062a \u06a9\u0647 \u0628\u0647 \u06cc\u06a9 \u0645\u0634\u06a9\u0644 \u0645\u0642\u06cc\u0627\u0633 \u067e\u0630\u06cc\u0631\u06cc \u062a\u0628\u062f\u06cc\u0644 \u0645\u06cc \u0634\u0648\u062f: \u0632\u0645\u0627\u0646 \u067e\u0627\u0633\u062e \u0628\u0647 \u0627\u0646\u062f\u0627\u0632\u0647 \u0627\u0646\u062f\u0627\u0632\u0647 \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u0628\u0633\u062a\u06af\u06cc \u062f\u0627\u0631\u062f \u062a\u0627 \u0627\u0646\u062f\u0627\u0632\u0647 \u0646\u062a\u06cc\u062c\u0647. \u067e\u0631\u0633 \u0648 \u062c\u0648 \u06a9\u0647 \u0642\u0631\u0627\u0631 \u0627\u0633\u062a \u0633\u0641\u0627\u0631\u0634\u0627\u062a \u0631\u0627 \u0627\u0632 \u06cc\u06a9 \u067e\u0646\u062c\u0631\u0647 \u0632\u0645\u0627\u0646\u06cc \u06a9\u0648\u0686\u06a9 \u0628\u062e\u0648\u0627\u0646\u062f \u060c \u0628\u0627\u06cc\u062f \u06a9\u0644 \u062a\u0627\u0631\u06cc\u062e \u0633\u0641\u0627\u0631\u0634\u0627\u062a \u0631\u0627 \u0628\u0631\u0627\u06cc \u06cc\u06a9 \u06a9\u0634\u0648\u0631 \u0648 \u06a9\u0644 \u062a\u0627\u0631\u06cc\u062e\u0686\u0647 \u062c\u0632\u0626\u06cc\u0627\u062a \u0628\u0631\u0627\u06cc \u06cc\u06a9 \u0645\u062d\u0635\u0648\u0644 \u0628\u062e\u0648\u0627\u0646\u062f. <\/p>\n<p>\u062a\u0648\u062c\u0647 \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u06cc\u062f \u06a9\u0647 \u0627\u06cc\u0646 \u0645\u062b\u0627\u0644 \u0628\u0647\u062a\u0631\u06cc\u0646 \u062d\u0627\u0644\u062a \u0627\u0633\u062a \u060c \u062c\u0627\u06cc\u06cc \u06a9\u0647 \u062c\u062f\u0627\u0648\u0644 \u062a\u0627\u0632\u0647 \u062e\u0627\u0644\u06cc \u0634\u062f\u0647 \u0627\u0646\u062f \u060c \u0648 <code>Index Only Scan<\/code> \u0628\u0647\u06cc\u0646\u0647 \u0628\u0627 <code>Heap Fetches: 0<\/code>\u0628\u0634\u0631 \u062f\u0631 \u06cc\u06a9 \u0645\u06cc\u0632 \u0641\u0639\u0627\u0644 \u06af\u0631\u0627\u0646 \u062a\u0631 \u062e\u0648\u0627\u0647\u062f \u0628\u0648\u062f.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%D9%85%D8%AF%D9%84_%D8%B3%D9%86%D8%AF_MongoDB\"><\/span>\n<p>  \u0645\u062f\u0644 \u0633\u0646\u062f MongoDB<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0645\u062f\u0644 \u0633\u0646\u062f MongoDB \u0627\u062c\u0627\u0632\u0647 \u0645\u06cc \u062f\u0647\u062f \u062a\u0627 \u062f\u0627\u062f\u0647 \u0647\u0627\u06cc \u0645\u0631\u062a\u0628\u0637 \u0631\u0627 \u062f\u0631 \u06cc\u06a9 \u0645\u062c\u0645\u0648\u0639\u0647 \u0648\u0627\u062d\u062f \u062a\u0639\u0628\u06cc\u0647 \u06a9\u0646\u06cc\u062f \u060c \u0648 \u0628\u0647\u06cc\u0646\u0647 \u0633\u0627\u0632\u06cc \u0645\u062d\u0644 \u062f\u0627\u062f\u0647 \u062f\u0631 \u062d\u0627\u0641\u0638\u0647 \u0648 \u062f\u06cc\u0633\u06a9.<\/p>\n<p>\u062f\u0631 \u0627\u06cc\u0646\u062c\u0627 \u0645\u062c\u0645\u0648\u0639\u0647 \u0627\u06cc \u0648\u062c\u0648\u062f \u062f\u0627\u0631\u062f \u06a9\u0647 \u062f\u0627\u062f\u0647 \u0647\u0627\u06cc \u0645\u0634\u0627\u0628\u0647\u06cc \u0631\u0627 \u0628\u0627 \u0646\u0645\u0648\u0646\u0647 \u0642\u0628\u0644\u06cc \u0628\u0627\u0631\u06af\u0630\u0627\u0631\u06cc \u0645\u06cc \u06a9\u0646\u062f \u060c \u0627\u0645\u0627 \u0628\u0627 \u062c\u0632\u0626\u06cc\u0627\u062a \u0633\u0641\u0627\u0631\u0634 \u062a\u0639\u0628\u06cc\u0647 \u0634\u062f\u0647 \u062f\u0631 \u0633\u0646\u062f \u0633\u0641\u0627\u0631\u0634\u0627\u062a \u060c \u0645\u0627\u0646\u0646\u062f \u0622\u0646 \u06a9\u0647 \u062f\u0631 \u06cc\u06a9 \u0633\u0646\u062f \u062a\u062c\u0627\u0631\u06cc \u06cc\u0627 \u06cc\u06a9 \u0634\u06cc\u0621 \u0628\u0631\u0646\u0627\u0645\u0647 \u0633\u0627\u062e\u062a\u0647 \u0634\u062f\u0647 \u0627\u0633\u062a:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight javascript\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">bulkOps<\/span> <span class=\"o\">=<\/span> <span class=\"p\">[];<\/span>\n<span class=\"k\">for <\/span><span class=\"p\">(<\/span><span class=\"kd\">let<\/span> <span class=\"nx\">i<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">0<\/span><span class=\"p\">;<\/span> <span class=\"nx\">i<\/span> <span class=\"o\">&lt;<\/span> <span class=\"mi\">1000000<\/span><span class=\"p\">;<\/span> <span class=\"nx\">i<\/span><span class=\"o\">++<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\n  <span class=\"kd\">const<\/span> <span class=\"nx\">orderDetails<\/span> <span class=\"o\">=<\/span> <span class=\"p\">[];<\/span>\n  <span class=\"k\">for <\/span><span class=\"p\">(<\/span><span class=\"kd\">let<\/span> <span class=\"nx\">line<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">1<\/span><span class=\"p\">;<\/span> <span class=\"nx\">line<\/span> <span class=\"o\">&lt;=<\/span> <span class=\"mi\">10<\/span><span class=\"p\">;<\/span> <span class=\"nx\">line<\/span><span class=\"o\">++<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\n    <span class=\"nx\">orderDetails<\/span><span class=\"p\">.<\/span><span class=\"nf\">push<\/span><span class=\"p\">({<\/span>\n      <span class=\"na\">line<\/span><span class=\"p\">:<\/span> <span class=\"nx\">line<\/span><span class=\"p\">,<\/span>\n      <span class=\"na\">product_id<\/span><span class=\"p\">:<\/span> <span class=\"nb\">Math<\/span><span class=\"p\">.<\/span><span class=\"nf\">floor<\/span><span class=\"p\">(<\/span><span class=\"nb\">Math<\/span><span class=\"p\">.<\/span><span class=\"nf\">log2<\/span><span class=\"p\">(<\/span><span class=\"mi\">1<\/span> <span class=\"o\">+<\/span> <span class=\"nx\">i<\/span> <span class=\"o\">*<\/span> <span class=\"nb\">Math<\/span><span class=\"p\">.<\/span><span class=\"nf\">random<\/span><span class=\"p\">())),<\/span>\n      <span class=\"na\">quantity<\/span><span class=\"p\">:<\/span> <span class=\"nb\">Math<\/span><span class=\"p\">.<\/span><span class=\"nf\">floor<\/span><span class=\"p\">(<\/span><span class=\"mi\">100<\/span> <span class=\"o\">*<\/span> <span class=\"nb\">Math<\/span><span class=\"p\">.<\/span><span class=\"nf\">random<\/span><span class=\"p\">()),<\/span>\n    <span class=\"p\">});<\/span>\n  <span class=\"p\">}<\/span>\n  <span class=\"nx\">bulkOps<\/span><span class=\"p\">.<\/span><span class=\"nf\">push<\/span><span class=\"p\">({<\/span>\n    <span class=\"na\">insertOne<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\n      <span class=\"na\">document<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\n        <span class=\"na\">country_id<\/span><span class=\"p\">:<\/span> <span class=\"nb\">Math<\/span><span class=\"p\">.<\/span><span class=\"nf\">floor<\/span><span class=\"p\">(<\/span><span class=\"mi\">10<\/span> <span class=\"o\">*<\/span> <span class=\"nb\">Math<\/span><span class=\"p\">.<\/span><span class=\"nf\">random<\/span><span class=\"p\">()),<\/span>\n        <span class=\"na\">created_at<\/span><span class=\"p\">:<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">Date<\/span><span class=\"p\">(),<\/span>\n        <span class=\"na\">order_details<\/span><span class=\"p\">:<\/span> <span class=\"nx\">orderDetails<\/span>\n      <span class=\"p\">}<\/span>\n    <span class=\"p\">}<\/span>\n  <span class=\"p\">});<\/span>\n<span class=\"p\">}<\/span>\n<span class=\"nx\">db<\/span><span class=\"p\">.<\/span><span class=\"nx\">orders<\/span><span class=\"p\">.<\/span><span class=\"nf\">bulkWrite<\/span><span class=\"p\">(<\/span><span class=\"nx\">bulkOps<\/span><span class=\"p\">);<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u06cc\u06a9\u06cc \u0627\u0632 \u0645\u0632\u06cc\u062a \u0647\u0627\u06cc \u0645\u062f\u0644 \u0633\u0646\u062f \u060c \u0627\u0645\u06a9\u0627\u0646 \u062f\u0631\u06cc\u0627\u0641\u062a \u0633\u0641\u0627\u0631\u0634 \u0628\u0627 \u062c\u0632\u0626\u06cc\u0627\u062a \u0622\u0646 \u0648 \u0628\u062f\u0648\u0646 \u067e\u06cc\u0648\u0633\u062a\u0646 \u0627\u0633\u062a:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"n\">test<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">db<\/span><span class=\"p\">.<\/span><span class=\"n\">orders<\/span><span class=\"p\">.<\/span><span class=\"n\">find<\/span><span class=\"p\">().<\/span><span class=\"n\">sort<\/span><span class=\"p\">({<\/span><span class=\"n\">created_at<\/span><span class=\"p\">:<\/span> <span class=\"o\">-<\/span><span class=\"mi\">1<\/span><span class=\"p\">}).<\/span><span class=\"k\">limit<\/span><span class=\"p\">(<\/span><span class=\"mi\">1<\/span><span class=\"p\">);<\/span>\n<span class=\"p\">[<\/span>\n  <span class=\"p\">{<\/span>\n    <span class=\"n\">_id<\/span><span class=\"p\">:<\/span> <span class=\"n\">ObjectId<\/span><span class=\"p\">(<\/span><span class=\"s1\">'67f1a477aabaf2dad73f4791'<\/span><span class=\"p\">),<\/span>\n    <span class=\"n\">country_id<\/span><span class=\"p\">:<\/span> <span class=\"mi\">3<\/span><span class=\"p\">,<\/span>\n    <span class=\"n\">created_at<\/span><span class=\"p\">:<\/span> <span class=\"n\">ISODate<\/span><span class=\"p\">(<\/span><span class=\"s1\">'2025-04-05T21:45:21.546Z'<\/span><span class=\"p\">),<\/span>\n    <span class=\"n\">order_details<\/span><span class=\"p\">:<\/span> <span class=\"p\">[<\/span>\n      <span class=\"p\">{<\/span> <span class=\"n\">line<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"n\">product_id<\/span><span class=\"p\">:<\/span> <span class=\"mi\">19<\/span><span class=\"p\">,<\/span> <span class=\"n\">quantity<\/span><span class=\"p\">:<\/span> <span class=\"mi\">40<\/span> <span class=\"p\">},<\/span>\n      <span class=\"p\">{<\/span> <span class=\"n\">line<\/span><span class=\"p\">:<\/span> <span class=\"mi\">2<\/span><span class=\"p\">,<\/span> <span class=\"n\">product_id<\/span><span class=\"p\">:<\/span> <span class=\"mi\">18<\/span><span class=\"p\">,<\/span> <span class=\"n\">quantity<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10<\/span> <span class=\"p\">},<\/span>\n      <span class=\"p\">{<\/span> <span class=\"n\">line<\/span><span class=\"p\">:<\/span> <span class=\"mi\">3<\/span><span class=\"p\">,<\/span> <span class=\"n\">product_id<\/span><span class=\"p\">:<\/span> <span class=\"mi\">18<\/span><span class=\"p\">,<\/span> <span class=\"n\">quantity<\/span><span class=\"p\">:<\/span> <span class=\"mi\">75<\/span> <span class=\"p\">},<\/span>\n      <span class=\"p\">{<\/span> <span class=\"n\">line<\/span><span class=\"p\">:<\/span> <span class=\"mi\">4<\/span><span class=\"p\">,<\/span> <span class=\"n\">product_id<\/span><span class=\"p\">:<\/span> <span class=\"mi\">18<\/span><span class=\"p\">,<\/span> <span class=\"n\">quantity<\/span><span class=\"p\">:<\/span> <span class=\"mi\">81<\/span> <span class=\"p\">},<\/span>\n      <span class=\"p\">{<\/span> <span class=\"n\">line<\/span><span class=\"p\">:<\/span> <span class=\"mi\">5<\/span><span class=\"p\">,<\/span> <span class=\"n\">product_id<\/span><span class=\"p\">:<\/span> <span class=\"mi\">16<\/span><span class=\"p\">,<\/span> <span class=\"n\">quantity<\/span><span class=\"p\">:<\/span> <span class=\"mi\">66<\/span> <span class=\"p\">},<\/span>\n      <span class=\"p\">{<\/span> <span class=\"n\">line<\/span><span class=\"p\">:<\/span> <span class=\"mi\">6<\/span><span class=\"p\">,<\/span> <span class=\"n\">product_id<\/span><span class=\"p\">:<\/span> <span class=\"mi\">14<\/span><span class=\"p\">,<\/span> <span class=\"n\">quantity<\/span><span class=\"p\">:<\/span> <span class=\"mi\">17<\/span> <span class=\"p\">},<\/span>\n      <span class=\"p\">{<\/span> <span class=\"n\">line<\/span><span class=\"p\">:<\/span> <span class=\"mi\">7<\/span><span class=\"p\">,<\/span> <span class=\"n\">product_id<\/span><span class=\"p\">:<\/span> <span class=\"mi\">19<\/span><span class=\"p\">,<\/span> <span class=\"n\">quantity<\/span><span class=\"p\">:<\/span> <span class=\"mi\">82<\/span> <span class=\"p\">},<\/span>\n      <span class=\"p\">{<\/span> <span class=\"n\">line<\/span><span class=\"p\">:<\/span> <span class=\"mi\">8<\/span><span class=\"p\">,<\/span> <span class=\"n\">product_id<\/span><span class=\"p\">:<\/span> <span class=\"mi\">19<\/span><span class=\"p\">,<\/span> <span class=\"n\">quantity<\/span><span class=\"p\">:<\/span> <span class=\"mi\">81<\/span> <span class=\"p\">},<\/span>\n      <span class=\"p\">{<\/span> <span class=\"n\">line<\/span><span class=\"p\">:<\/span> <span class=\"mi\">9<\/span><span class=\"p\">,<\/span> <span class=\"n\">product_id<\/span><span class=\"p\">:<\/span> <span class=\"mi\">17<\/span><span class=\"p\">,<\/span> <span class=\"n\">quantity<\/span><span class=\"p\">:<\/span> <span class=\"mi\">56<\/span> <span class=\"p\">},<\/span>\n      <span class=\"p\">{<\/span> <span class=\"n\">line<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10<\/span><span class=\"p\">,<\/span> <span class=\"n\">product_id<\/span><span class=\"p\">:<\/span> <span class=\"mi\">19<\/span><span class=\"p\">,<\/span> <span class=\"n\">quantity<\/span><span class=\"p\">:<\/span> <span class=\"mi\">59<\/span> <span class=\"p\">}<\/span>\n    <span class=\"p\">]<\/span>\n  <span class=\"p\">}<\/span>\n<span class=\"p\">]<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u062f\u0627\u0634\u062a\u0646 \u062a\u0645\u0627\u0645 \u0632\u0645\u06cc\u0646\u0647 \u0647\u0627 \u062f\u0631 \u06cc\u06a9 \u0633\u0646\u062f \u0627\u0645\u06a9\u0627\u0646 \u0627\u06cc\u062c\u0627\u062f \u06cc\u06a9 \u0641\u0647\u0631\u0633\u062a \u0648\u0627\u062d\u062f \u0631\u0627 \u0641\u0631\u0627\u0647\u0645 \u0645\u06cc \u06a9\u0646\u062f \u06a9\u0647 \u062a\u0645\u0627\u0645 \u0641\u06cc\u0644\u062a\u0631\u0647\u0627 \u0631\u0627 \u062f\u0631 \u0628\u0631 \u0645\u06cc \u06af\u06cc\u0631\u062f \u060c \u0648 MongoDB \u0627\u0632 \u0634\u0627\u062e\u0635 \u0647\u0627\u06cc \u0686\u0646\u062f \u06a9\u0644\u06cc\u062f \u067e\u0634\u062a\u06cc\u0628\u0627\u0646\u06cc \u0645\u06cc \u06a9\u0646\u062f \u060c \u06a9\u0647 \u0632\u0645\u06cc\u0646\u0647 \u0647\u0627\u06cc \u0641\u0647\u0631\u0633\u062a \u0628\u0646\u062f\u06cc \u0631\u0627 \u062f\u0631 \u0632\u06cc\u0631 \u0645\u062c\u0645\u0648\u0639\u0647 \u0647\u0627\u06cc \u062a\u0639\u0628\u06cc\u0647 \u0634\u062f\u0647 \u0627\u0645\u06a9\u0627\u0646 \u067e\u0630\u06cc\u0631 \u0645\u06cc \u06a9\u0646\u062f:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight javascript\"><code><span class=\"nx\">db<\/span><span class=\"p\">.<\/span><span class=\"nx\">orders<\/span><span class=\"p\">.<\/span><span class=\"nf\">createIndex<\/span><span class=\"p\">(<\/span>\n <span class=\"p\">{<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">country_id<\/span><span class=\"dl\">\"<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">order_details.product_id<\/span><span class=\"dl\">\"<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">created_at<\/span><span class=\"dl\">\"<\/span><span class=\"p\">:<\/span> <span class=\"o\">-<\/span><span class=\"mi\">1<\/span> <span class=\"p\">}<\/span>\n<span class=\"p\">);<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u067e\u0631\u0633 \u0648 \u062c\u0648 \u0628\u0631\u0627\u06cc \u0628\u0627\u0632\u0646\u0634\u0633\u062a\u06af\u06cc \u062f\u0647 \u0633\u0641\u0627\u0631\u0634 \u0622\u062e\u0631 \u0628\u0631\u0627\u06cc \u06cc\u06a9 \u06a9\u0634\u0648\u0631 \u0648 \u06cc\u06a9 \u0645\u062d\u0635\u0648\u0644 \u0628\u062f\u0648\u0646 \u067e\u06cc\u0648\u0633\u062a\u0646 \u0633\u0627\u062f\u0647 \u0627\u0633\u062a:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight javascript\"><code><span class=\"nx\">db<\/span><span class=\"p\">.<\/span><span class=\"nx\">orders<\/span><span class=\"p\">.<\/span><span class=\"nf\">find<\/span><span class=\"p\">(<\/span>\n  <span class=\"p\">{<\/span> <span class=\"na\">country_id<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"na\">order_details<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"na\">$elemMatch<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"na\">product_id<\/span><span class=\"p\">:<\/span> <span class=\"mi\">15<\/span> <span class=\"p\">}<\/span> <span class=\"p\">}<\/span> <span class=\"p\">}<\/span>\n<span class=\"p\">).<\/span><span class=\"nf\">sort<\/span><span class=\"p\">({<\/span> <span class=\"na\">created_at<\/span><span class=\"p\">:<\/span> <span class=\"o\">-<\/span><span class=\"mi\">1<\/span> <span class=\"p\">}).<\/span><span class=\"nf\">limit<\/span><span class=\"p\">(<\/span><span class=\"mi\">10<\/span><span class=\"p\">);<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0628\u06cc\u0627\u06cc\u06cc\u062f \u0628\u0631\u0646\u0627\u0645\u0647 \u0627\u062c\u0631\u0627\u06cc \u0631\u0627 \u0628\u0631\u0631\u0633\u06cc \u06a9\u0646\u06cc\u0645:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight javascript\"><code><span class=\"nx\">mdb<\/span><span class=\"o\">&gt;<\/span> <span class=\"nx\">db<\/span><span class=\"p\">.<\/span><span class=\"nx\">orders<\/span><span class=\"p\">.<\/span><span class=\"nf\">find<\/span><span class=\"p\">(<\/span>\n   <span class=\"p\">{<\/span> <span class=\"na\">country_id<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"na\">order_details<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"na\">$elemMatch<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"na\">product_id<\/span><span class=\"p\">:<\/span> <span class=\"mi\">15<\/span> <span class=\"p\">}<\/span> <span class=\"p\">}<\/span> <span class=\"p\">}<\/span>\n <span class=\"p\">).<\/span><span class=\"nf\">sort<\/span><span class=\"p\">({<\/span> <span class=\"na\">created_at<\/span><span class=\"p\">:<\/span> <span class=\"o\">-<\/span><span class=\"mi\">1<\/span> <span class=\"p\">}).<\/span><span class=\"nf\">limit<\/span><span class=\"p\">(<\/span><span class=\"mi\">10<\/span><span class=\"p\">).<\/span><span class=\"nf\">explain<\/span><span class=\"p\">(<\/span><span class=\"s2\">`executionStats`<\/span><span class=\"p\">).<\/span><span class=\"nx\">executionStats<\/span>\n<span class=\"p\">;<\/span>\n<span class=\"p\">{<\/span>\n  <span class=\"na\">executionSuccess<\/span><span class=\"p\">:<\/span> <span class=\"kc\">true<\/span><span class=\"p\">,<\/span>\n  <span class=\"na\">nReturned<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10<\/span><span class=\"p\">,<\/span>\n  <span class=\"na\">executionTimeMillis<\/span><span class=\"p\">:<\/span> <span class=\"mi\">0<\/span><span class=\"p\">,<\/span>\n  <span class=\"na\">totalKeysExamined<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10<\/span><span class=\"p\">,<\/span>\n  <span class=\"na\">totalDocsExamined<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10<\/span><span class=\"p\">,<\/span>\n  <span class=\"na\">executionStages<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\n    <span class=\"na\">isCached<\/span><span class=\"p\">:<\/span> <span class=\"kc\">false<\/span><span class=\"p\">,<\/span>\n    <span class=\"na\">stage<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">LIMIT<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\n    <span class=\"na\">nReturned<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10<\/span><span class=\"p\">,<\/span>\n    <span class=\"na\">executionTimeMillisEstimate<\/span><span class=\"p\">:<\/span> <span class=\"mi\">0<\/span><span class=\"p\">,<\/span>\n    <span class=\"na\">works<\/span><span class=\"p\">:<\/span> <span class=\"mi\">11<\/span><span class=\"p\">,<\/span>\n    <span class=\"na\">advanced<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10<\/span><span class=\"p\">,<\/span>\n    <span class=\"na\">limitAmount<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10<\/span><span class=\"p\">,<\/span>\n    <span class=\"na\">inputStage<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\n      <span class=\"na\">stage<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">FETCH<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\n      <span class=\"na\">filter<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\n        <span class=\"na\">order_details<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">$elemMatch<\/span><span class=\"dl\">'<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"na\">product_id<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">$eq<\/span><span class=\"dl\">'<\/span><span class=\"p\">:<\/span> <span class=\"mi\">15<\/span> <span class=\"p\">}<\/span> <span class=\"p\">}<\/span> <span class=\"p\">}<\/span>\n      <span class=\"p\">},<\/span>\n      <span class=\"na\">nReturned<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10<\/span><span class=\"p\">,<\/span>\n      <span class=\"na\">executionTimeMillisEstimate<\/span><span class=\"p\">:<\/span> <span class=\"mi\">0<\/span><span class=\"p\">,<\/span>\n      <span class=\"na\">works<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10<\/span><span class=\"p\">,<\/span>\n      <span class=\"na\">advanced<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10<\/span><span class=\"p\">,<\/span>\n      <span class=\"na\">docsExamined<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10<\/span><span class=\"p\">,<\/span>\n      <span class=\"na\">alreadyHasObj<\/span><span class=\"p\">:<\/span> <span class=\"mi\">0<\/span><span class=\"p\">,<\/span>\n      <span class=\"na\">inputStage<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\n        <span class=\"na\">stage<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">IXSCAN<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\n        <span class=\"na\">nReturned<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10<\/span><span class=\"p\">,<\/span>\n        <span class=\"na\">executionTimeMillisEstimate<\/span><span class=\"p\">:<\/span> <span class=\"mi\">0<\/span><span class=\"p\">,<\/span>\n        <span class=\"na\">works<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10<\/span><span class=\"p\">,<\/span>\n        <span class=\"na\">advanced<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10<\/span><span class=\"p\">,<\/span>\n        <span class=\"na\">keyPattern<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\n          <span class=\"na\">country_id<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span>\n          <span class=\"dl\">'<\/span><span class=\"s1\">order_details.product_id<\/span><span class=\"dl\">'<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span>\n          <span class=\"na\">created_at<\/span><span class=\"p\">:<\/span> <span class=\"o\">-<\/span><span class=\"mi\">1<\/span>\n        <span class=\"p\">},<\/span>\n        <span class=\"na\">indexName<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">country_id_1_order_details.product_id_1_created_at_-1<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\n        <span class=\"na\">isMultiKey<\/span><span class=\"p\">:<\/span> <span class=\"kc\">true<\/span><span class=\"p\">,<\/span>\n        <span class=\"na\">multiKeyPaths<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\n          <span class=\"na\">country_id<\/span><span class=\"p\">:<\/span> <span class=\"p\">[],<\/span>\n          <span class=\"dl\">'<\/span><span class=\"s1\">order_details.product_id<\/span><span class=\"dl\">'<\/span><span class=\"p\">:<\/span> <span class=\"p\">[<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">order_details<\/span><span class=\"dl\">'<\/span> <span class=\"p\">],<\/span>\n          <span class=\"na\">created_at<\/span><span class=\"p\">:<\/span> <span class=\"p\">[]<\/span>\n        <span class=\"p\">},<\/span>\n        <span class=\"na\">isUnique<\/span><span class=\"p\">:<\/span> <span class=\"kc\">false<\/span><span class=\"p\">,<\/span>\n        <span class=\"na\">isSparse<\/span><span class=\"p\">:<\/span> <span class=\"kc\">false<\/span><span class=\"p\">,<\/span>\n        <span class=\"na\">isPartial<\/span><span class=\"p\">:<\/span> <span class=\"kc\">false<\/span><span class=\"p\">,<\/span>\n        <span class=\"na\">indexVersion<\/span><span class=\"p\">:<\/span> <span class=\"mi\">2<\/span><span class=\"p\">,<\/span>\n        <span class=\"na\">direction<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">forward<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\n        <span class=\"na\">indexBounds<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\n          <span class=\"na\">country_id<\/span><span class=\"p\">:<\/span> <span class=\"p\">[<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">[1, 1]<\/span><span class=\"dl\">'<\/span> <span class=\"p\">],<\/span>\n          <span class=\"dl\">'<\/span><span class=\"s1\">order_details.product_id<\/span><span class=\"dl\">'<\/span><span class=\"p\">:<\/span> <span class=\"p\">[<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">[15, 15]<\/span><span class=\"dl\">'<\/span> <span class=\"p\">],<\/span>\n          <span class=\"na\">created_at<\/span><span class=\"p\">:<\/span> <span class=\"p\">[<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">[MaxKey, MinKey]<\/span><span class=\"dl\">'<\/span> <span class=\"p\">]<\/span>\n        <span class=\"p\">},<\/span>\n        <span class=\"na\">keysExamined<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10<\/span><span class=\"p\">,<\/span>\n        <span class=\"na\">seeks<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span>\n        <span class=\"na\">dupsTested<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10<\/span><span class=\"p\">,<\/span>\n        <span class=\"na\">dupsDropped<\/span><span class=\"p\">:<\/span> <span class=\"mi\">0<\/span>\n      <span class=\"p\">}<\/span>\n    <span class=\"p\">}<\/span>\n  <span class=\"p\">}<\/span>\n<span class=\"p\">}<\/span>\n\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0627\u06cc\u0646 \u0637\u0631\u062d \u062c\u0632\u0626\u06cc\u0627\u062a \u0632\u06cc\u0627\u062f\u06cc \u0631\u0627 \u0646\u0634\u0627\u0646 \u0645\u06cc \u062f\u0647\u062f \u060c \u0627\u0645\u0627 \u0645\u0647\u0645\u062a\u0631\u06cc\u0646 \u0622\u0646\u0647\u0627:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight yaml\"><code>  <span class=\"na\">nReturned<\/span><span class=\"pi\">:<\/span> <span class=\"s\">10,<\/span>\n  <span class=\"na\">totalKeysExamined<\/span><span class=\"pi\">:<\/span> <span class=\"s\">10,<\/span>\n  <span class=\"na\">totalDocsExamined<\/span><span class=\"pi\">:<\/span> <span class=\"s\">10,<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0628\u0631\u0627\u06cc \u0628\u0647 \u062f\u0633\u062a \u0622\u0648\u0631\u062f\u0646 10 \u0631\u062f\u06cc\u0641 \u0628\u0631\u0627\u06cc \u0646\u062a\u06cc\u062c\u0647 \u060c MongoDB \u0641\u0642\u0637 10 \u0648\u0631\u0648\u062f\u06cc \u0641\u0647\u0631\u0633\u062a \u0648 10 \u0633\u0646\u062f \u0631\u0627 \u062e\u0648\u0627\u0646\u062f\u0647 \u0627\u0633\u062a. \u0627\u06cc\u0646 \u0628\u0647\u06cc\u0646\u0647 \u062a\u0631\u06cc\u0646 \u060c \u062e\u0648\u0627\u0646\u062f\u0646 \u0641\u0642\u0637 \u0622\u0646\u0686\u0647 \u0644\u0627\u0632\u0645 \u0627\u0633\u062a. \u0627\u0633\u06a9\u0646 \u0634\u0627\u062e\u0635 \u0628\u0647\u06cc\u0646\u0647 \u0627\u0633\u062a \u0632\u06cc\u0631\u0627 \u062d\u0627\u0648\u06cc \u0645\u0631\u0632\u0647\u0627\u06cc \u062a\u0645\u0627\u0645 \u0641\u06cc\u0644\u062a\u0631\u0647\u0627\u06cc \u0628\u0631\u0627\u0628\u0631\u06cc \u0627\u0633\u062a \u0648 \u0631\u062f\u06cc\u0641 \u0647\u0627 \u0631\u0627 \u0628\u062f\u0648\u0646 \u0646\u06cc\u0627\u0632 \u0628\u0647 \u06cc\u06a9 \u0646\u0648\u0639 \u0627\u0636\u0627\u0641\u06cc \u0633\u0641\u0627\u0631\u0634 \u0645\u06cc \u062f\u0647\u062f:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight javascript\"><code>        <span class=\"nx\">indexBounds<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\n          <span class=\"nl\">country_id<\/span><span class=\"p\">:<\/span> <span class=\"p\">[<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">[1, 1]<\/span><span class=\"dl\">'<\/span> <span class=\"p\">],<\/span>\n          <span class=\"dl\">'<\/span><span class=\"s1\">order_details.product_id<\/span><span class=\"dl\">'<\/span><span class=\"p\">:<\/span> <span class=\"p\">[<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">[15, 15]<\/span><span class=\"dl\">'<\/span> <span class=\"p\">],<\/span>\n          <span class=\"nx\">created_at<\/span><span class=\"p\">:<\/span> <span class=\"p\">[<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">[MaxKey, MinKey]<\/span><span class=\"dl\">'<\/span> <span class=\"p\">]<\/span>\n        <span class=\"p\">},<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0639\u0644\u0627\u0648\u0647 \u0628\u0631 \u0633\u0631\u06cc\u0639 \u0628\u0648\u062f\u0646 \u060c \u0639\u0645\u0644\u06a9\u0631\u062f \u0642\u0627\u0628\u0644 \u067e\u06cc\u0634 \u0628\u06cc\u0646\u06cc \u0627\u0633\u062a \u0632\u06cc\u0631\u0627 \u0627\u06cc\u0646 \u0637\u0631\u062d \u0627\u062c\u0631\u0627\u06cc \u0647\u0645\u06cc\u0634\u0647 \u06cc\u06a9\u0633\u0627\u0646 \u062e\u0648\u0627\u0647\u062f \u0628\u0648\u062f. \u0627\u06cc\u0646 \u0642\u0627\u0628\u0644 \u0645\u0634\u0627\u0647\u062f\u0647 \u0627\u0633\u062a <code>allPlansExecution<\/code>:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight javascript\"><code><span class=\"nx\">mdb<\/span><span class=\"o\">&gt;<\/span> <span class=\"nx\">db<\/span><span class=\"p\">.<\/span><span class=\"nx\">orders<\/span><span class=\"p\">.<\/span><span class=\"nf\">find<\/span><span class=\"p\">(<\/span>\n   <span class=\"p\">{<\/span> <span class=\"na\">country_id<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"na\">order_details<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"na\">$elemMatch<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"na\">product_id<\/span><span class=\"p\">:<\/span> <span class=\"mi\">15<\/span> <span class=\"p\">}<\/span> <span class=\"p\">}<\/span> <span class=\"p\">}<\/span>\n <span class=\"p\">).<\/span><span class=\"nf\">sort<\/span><span class=\"p\">({<\/span> <span class=\"na\">created_at<\/span><span class=\"p\">:<\/span> <span class=\"o\">-<\/span><span class=\"mi\">1<\/span> <span class=\"p\">}).<\/span><span class=\"nf\">limit<\/span><span class=\"p\">(<\/span><span class=\"mi\">10<\/span><span class=\"p\">).<\/span><span class=\"nf\">explain<\/span><span class=\"p\">(<\/span><span class=\"s2\">`allPlansExecution`<\/span><span class=\"p\">).<\/span><span class=\"nx\">queryPlanner<\/span>\n<span class=\"p\">;<\/span>\n<span class=\"p\">{<\/span>\n  <span class=\"na\">namespace<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">test.orders<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\n  <span class=\"na\">parsedQuery<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\n    <span class=\"dl\">'<\/span><span class=\"s1\">$and<\/span><span class=\"dl\">'<\/span><span class=\"p\">:<\/span> <span class=\"p\">[<\/span>\n      <span class=\"p\">{<\/span>\n        <span class=\"na\">order_details<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">$elemMatch<\/span><span class=\"dl\">'<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"na\">product_id<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">$eq<\/span><span class=\"dl\">'<\/span><span class=\"p\">:<\/span> <span class=\"mi\">42<\/span> <span class=\"p\">}<\/span> <span class=\"p\">}<\/span> <span class=\"p\">}<\/span>\n      <span class=\"p\">},<\/span>\n      <span class=\"p\">{<\/span> <span class=\"na\">country_id<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">$eq<\/span><span class=\"dl\">'<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span> <span class=\"p\">}<\/span> <span class=\"p\">}<\/span>\n    <span class=\"p\">]<\/span>\n  <span class=\"p\">},<\/span>\n  <span class=\"na\">indexFilterSet<\/span><span class=\"p\">:<\/span> <span class=\"kc\">false<\/span><span class=\"p\">,<\/span>\n  <span class=\"na\">queryHash<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">0DAE06A4<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\n  <span class=\"na\">planCacheShapeHash<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">0DAE06A4<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\n  <span class=\"na\">planCacheKey<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">C3D96884<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\n  <span class=\"na\">optimizationTimeMillis<\/span><span class=\"p\">:<\/span> <span class=\"mi\">0<\/span><span class=\"p\">,<\/span>\n  <span class=\"na\">maxIndexedOrSolutionsReached<\/span><span class=\"p\">:<\/span> <span class=\"kc\">false<\/span><span class=\"p\">,<\/span>\n  <span class=\"na\">maxIndexedAndSolutionsReached<\/span><span class=\"p\">:<\/span> <span class=\"kc\">false<\/span><span class=\"p\">,<\/span>\n  <span class=\"na\">maxScansToExplodeReached<\/span><span class=\"p\">:<\/span> <span class=\"kc\">false<\/span><span class=\"p\">,<\/span>\n  <span class=\"na\">prunedSimilarIndexes<\/span><span class=\"p\">:<\/span> <span class=\"kc\">false<\/span><span class=\"p\">,<\/span>\n  <span class=\"na\">winningPlan<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\n    <span class=\"na\">isCached<\/span><span class=\"p\">:<\/span> <span class=\"kc\">false<\/span><span class=\"p\">,<\/span>\n    <span class=\"na\">stage<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">LIMIT<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\n    <span class=\"na\">limitAmount<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10<\/span><span class=\"p\">,<\/span>\n    <span class=\"na\">inputStage<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\n      <span class=\"na\">stage<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">FETCH<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\n      <span class=\"na\">filter<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\n        <span class=\"na\">order_details<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">$elemMatch<\/span><span class=\"dl\">'<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"na\">product_id<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">$eq<\/span><span class=\"dl\">'<\/span><span class=\"p\">:<\/span> <span class=\"mi\">42<\/span> <span class=\"p\">}<\/span> <span class=\"p\">}<\/span> <span class=\"p\">}<\/span>\n      <span class=\"p\">},<\/span>\n      <span class=\"na\">inputStage<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\n        <span class=\"na\">stage<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">IXSCAN<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\n        <span class=\"na\">keyPattern<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\n          <span class=\"na\">country_id<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span>\n          <span class=\"dl\">'<\/span><span class=\"s1\">order_details.product_id<\/span><span class=\"dl\">'<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span>\n          <span class=\"na\">created_at<\/span><span class=\"p\">:<\/span> <span class=\"o\">-<\/span><span class=\"mi\">1<\/span>\n        <span class=\"p\">},<\/span>\n        <span class=\"na\">indexName<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">country_id_1_order_details.product_id_1_created_at_-1<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\n        <span class=\"na\">isMultiKey<\/span><span class=\"p\">:<\/span> <span class=\"kc\">true<\/span><span class=\"p\">,<\/span>\n        <span class=\"na\">multiKeyPaths<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\n          <span class=\"na\">country_id<\/span><span class=\"p\">:<\/span> <span class=\"p\">[],<\/span>\n          <span class=\"dl\">'<\/span><span class=\"s1\">order_details.product_id<\/span><span class=\"dl\">'<\/span><span class=\"p\">:<\/span> <span class=\"p\">[<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">order_details<\/span><span class=\"dl\">'<\/span> <span class=\"p\">],<\/span>\n          <span class=\"na\">created_at<\/span><span class=\"p\">:<\/span> <span class=\"p\">[]<\/span>\n        <span class=\"p\">},<\/span>\n        <span class=\"na\">isUnique<\/span><span class=\"p\">:<\/span> <span class=\"kc\">false<\/span><span class=\"p\">,<\/span>\n        <span class=\"na\">isSparse<\/span><span class=\"p\">:<\/span> <span class=\"kc\">false<\/span><span class=\"p\">,<\/span>\n        <span class=\"na\">isPartial<\/span><span class=\"p\">:<\/span> <span class=\"kc\">false<\/span><span class=\"p\">,<\/span>\n        <span class=\"na\">indexVersion<\/span><span class=\"p\">:<\/span> <span class=\"mi\">2<\/span><span class=\"p\">,<\/span>\n        <span class=\"na\">direction<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">forward<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\n        <span class=\"na\">indexBounds<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\n          <span class=\"na\">country_id<\/span><span class=\"p\">:<\/span> <span class=\"p\">[<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">[1, 1]<\/span><span class=\"dl\">'<\/span> <span class=\"p\">],<\/span>\n          <span class=\"dl\">'<\/span><span class=\"s1\">order_details.product_id<\/span><span class=\"dl\">'<\/span><span class=\"p\">:<\/span> <span class=\"p\">[<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">[42, 42]<\/span><span class=\"dl\">'<\/span> <span class=\"p\">],<\/span>\n          <span class=\"na\">created_at<\/span><span class=\"p\">:<\/span> <span class=\"p\">[<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">[MaxKey, MinKey]<\/span><span class=\"dl\">'<\/span> <span class=\"p\">]<\/span>\n        <span class=\"p\">}<\/span>\n      <span class=\"p\">}<\/span>\n    <span class=\"p\">}<\/span>\n  <span class=\"p\">},<\/span>\n  <span class=\"na\">rejectedPlans<\/span><span class=\"p\">:<\/span> <span class=\"p\">[]<\/span>\n<span class=\"p\">}<\/span>\n\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0641\u0642\u0637 \u06cc\u06a9 \u0628\u0631\u0646\u0627\u0645\u0647 \u062f\u0631 \u062d\u0627\u0641\u0638\u0647 \u0646\u0647\u0627\u0646 \u0648\u062c\u0648\u062f \u062f\u0627\u0631\u062f \u060c \u0648 \u0647\u06cc\u0686 \u0628\u0631\u0646\u0627\u0645\u0647 \u0627\u06cc \u0631\u062f \u0646\u0634\u062f\u0647 \u0627\u0633\u062a.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%D9%BE%D8%A7%DB%8C%D8%A7%D9%86\"><\/span>\n<p>  \u067e\u0627\u06cc\u0627\u0646<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0647\u0646\u06af\u0627\u0645\u06cc \u06a9\u0647 \u062a\u0648\u0633\u0639\u0647 \u062f\u0647\u0646\u062f\u06af\u0627\u0646 \u0627\u062f\u0639\u0627 \u0645\u06cc \u06a9\u0646\u0646\u062f \u06a9\u0647 &#8220;\u067e\u06cc\u0648\u0633\u062a\u0646 \u0622\u0647\u0633\u062a\u0647&#8221; \u0627\u0633\u062a \u060c \u0645\u0631\u0628\u0648\u0637 \u0628\u0647 \u062e\u0648\u062f \u0627\u0639\u062f\u0627\u0645 \u0646\u06cc\u0633\u062a. \u0628\u0627\u0646\u06a9\u0647\u0627\u06cc \u0627\u0637\u0644\u0627\u0639\u0627\u062a\u06cc SQL \u062f\u0627\u0631\u0627\u06cc \u062f\u0647 \u0647\u0627 \u0633\u0627\u0644 \u0628\u0647\u06cc\u0646\u0647 \u0633\u0627\u0632\u06cc \u0647\u0633\u062a\u0646\u062f \u060c \u0628\u0627 \u0631\u0648\u0634 \u0647\u0627\u06cc \u0645\u062e\u062a\u0644\u0641 \u067e\u06cc\u0648\u0633\u062a\u0646 \u060c \u0630\u062e\u06cc\u0631\u0647 \u0648 \u0628\u0627\u0641\u0631. \u0628\u0627 \u0627\u06cc\u0646 \u062d\u0627\u0644 \u060c \u0647\u0646\u06af\u0627\u0645\u06cc \u06a9\u0647 \u0641\u06cc\u0644\u062a\u0631\u0647\u0627 \u0646\u0645\u06cc \u062a\u0648\u0627\u0646\u0646\u062f \u0642\u0628\u0644 \u0627\u0632 \u067e\u06cc\u0648\u0633\u062a\u0646 \u0628\u0647 \u067e\u0627\u06cc\u06cc\u0646 \u0641\u0634\u0627\u0631 \u0628\u06cc\u0627\u06cc\u0646\u062f \u060c \u0627\u0632 \u0641\u06cc\u0644\u062a\u0631 \u0632\u0648\u062f\u0631\u0633 \u062c\u0644\u0648\u06af\u06cc\u0631\u06cc \u0645\u06cc \u06a9\u0646\u062f \u060c \u062f\u0631 \u0646\u062a\u06cc\u062c\u0647 \u067e\u06cc\u0648\u0633\u062a\u0646 \u0628\u0647 \u0631\u062f\u06cc\u0641 \u0628\u06cc\u0634 \u0627\u0632 \u062d\u062f \u060c \u0632\u0645\u0627\u0646 \u067e\u0627\u0633\u062e \u0637\u0648\u0644\u0627\u0646\u06cc \u0648 \u0628\u0631\u0646\u0627\u0645\u0647 \u0647\u0627\u06cc \u0627\u062c\u0631\u0627\u06cc \u0646\u0627\u067e\u0627\u06cc\u062f\u0627\u0631.<\/p>\n<p>\u062a\u0648\u0633\u0639\u0647 \u062f\u0647\u0646\u062f\u06af\u0627\u0646 \u0648 DBA \u0645\u0648\u0642\u0639\u06cc\u062a \u0647\u0627\u06cc \u0645\u062e\u062a\u0644\u0641 \u0631\u0627 \u0645\u062a\u0641\u0627\u0648\u062a \u0645\u06cc \u062f\u0627\u0646\u0646\u062f. \u062a\u0648\u0633\u0639\u0647 \u062f\u0647\u0646\u062f\u06af\u0627\u0646 \u0632\u0645\u0627\u0646 \u067e\u0627\u0633\u062e \u0622\u0647\u0633\u062a\u0647 \u0648 \u067e\u06cc\u0648\u0646\u062f\u0647\u0627\u06cc \u0645\u0634\u06a9\u0644 \u0633\u0627\u0632 \u0631\u0627 \u062a\u062c\u0631\u0628\u0647 \u0645\u06cc \u06a9\u0646\u0646\u062f \u060c \u062f\u0631 \u062d\u0627\u0644\u06cc \u06a9\u0647 DBA \u06a9\u0627\u0631\u0622\u06cc\u06cc \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u0631\u0627 \u062f\u0631 \u067e\u06cc\u0648\u0633\u062a\u0646 \u0628\u0647 \u062a\u0639\u062f\u0627\u062f \u0632\u06cc\u0627\u062f\u06cc \u0631\u062f\u06cc\u0641 \u0645\u0634\u0627\u0647\u062f\u0647 \u0645\u06cc \u06a9\u0646\u062f. \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u0645\u062b\u0627\u0644 \u060c \u0647\u0646\u06af\u0627\u0645\u06cc \u06a9\u0647 \u0645\u06cc\u0644\u06cc\u0648\u0646 \u0647\u0627 \u0631\u062f\u06cc\u0641 \u0628\u0631\u0627\u06cc \u0628\u0627\u0632\u06af\u0634\u062a \u06cc\u06a9 \u0646\u062a\u06cc\u062c\u0647 \u06a9\u0648\u0686\u06a9 \u062f\u0631 \u0686\u0646\u062f \u062b\u0627\u0646\u06cc\u0647 \u067e\u06cc\u0648\u0633\u062a\u0646\u062f \u060c \u0645\u0633\u0627\u0626\u0644 \u0645\u0631\u0628\u0648\u0637 \u0628\u0647 DBAS \u0631\u0627 \u0628\u0647 \u0646\u0645\u0627\u06cc\u0634 \u062f\u0627\u062f\u0647 \u0634\u062f\u06af\u0627\u0646 \u0636\u0639\u06cc\u0641 \u0646\u0634\u0627\u0646 \u0645\u06cc \u062f\u0647\u062f \u060c \u062f\u0631 \u062d\u0627\u0644\u06cc \u06a9\u0647 \u062a\u0648\u0633\u0639\u0647 \u062f\u0647\u0646\u062f\u06af\u0627\u0646 \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u0631\u0627\u0628\u0637\u0647 \u0627\u06cc \u0631\u0627 \u0628\u0647 \u0686\u0627\u0644\u0634 \u0645\u06cc \u06a9\u0634\u0646\u062f.<\/p>\n<p>\u06cc\u06a9 \u0628\u0627\u0646\u06a9 \u0627\u0637\u0644\u0627\u0639\u0627\u062a\u06cc \u0627\u0633\u0646\u0627\u062f \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0645\u062f\u0644 \u0633\u0627\u0632\u06cc \u062f\u0627\u062f\u0647 \u0647\u0627 \u0648 \u0639\u0645\u0644\u06a9\u0631\u062f \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0631\u0627 \u0627\u0641\u0632\u0627\u06cc\u0634 \u062f\u0647\u062f \u060c \u0628\u0647 \u062e\u0635\u0648\u0635 \u0647\u0646\u06af\u0627\u0645\u06cc \u06a9\u0647 \u0634\u0627\u062e\u0635 \u0647\u0627\u06cc \u0686\u0646\u062f \u06a9\u0644\u06cc\u062f \u0628\u0631\u0627\u0628\u0631\u06cc \u060c \u0645\u0631\u062a\u0628 \u0633\u0627\u0632\u06cc \u0648 \u062f\u0627\u0645\u0646\u0647 \u0631\u0627 \u0628\u0647\u06cc\u0646\u0647 \u0645\u06cc \u06a9\u0646\u0646\u062f. MongoDB \u0627\u0632 \u0627\u06cc\u0646 \u0627\u0645\u0631 \u0628\u0647 \u0631\u0627\u062d\u062a\u06cc \u067e\u0634\u062a\u06cc\u0628\u0627\u0646\u06cc \u0645\u06cc \u06a9\u0646\u062f \u060c \u0632\u06cc\u0631\u0627 \u0634\u0627\u062e\u0635 \u0647\u0627\u06cc \u0622\u0646 \u0628\u0631\u0627\u06cc \u0627\u0633\u0646\u0627\u062f \u0637\u0631\u0627\u062d\u06cc \u0634\u062f\u0647 \u0627\u0646\u062f. PostgreSQL \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0627\u0633\u0646\u0627\u062f \u0631\u0627 \u062f\u0631 JSONB \u0630\u062e\u06cc\u0631\u0647 \u06a9\u0646\u062f \u060c \u0627\u0645\u0627 \u0634\u0627\u062e\u0635 \u0647\u0627\u06cc \u0645\u0648\u062c\u0648\u062f \u062f\u0631 \u0622\u0631\u0627\u06cc\u0647 \u0647\u0627 \u0628\u0647 \u0634\u0627\u062e\u0635 \u0647\u0627\u06cc \u062c\u06cc\u0646 \u0627\u062d\u062a\u06cc\u0627\u062c \u062f\u0627\u0631\u0646\u062f \u0648 \u0622\u0646\u0647\u0627 \u0646\u0638\u0645 \u0645\u0631\u062a\u0628 \u0633\u0627\u0632\u06cc \u0631\u0627 \u062d\u0641\u0638 \u0646\u0645\u06cc \u06a9\u0646\u0646\u062f \u06cc\u0627 \u0646\u0645\u0627\u06cc\u0634 \u062f\u0627\u062f\u0647 \u0647\u0627\u06cc \u062f\u0627\u0645\u0646\u0647 \u0631\u0627 \u0628\u0647 \u0637\u0648\u0631 \u06a9\u0627\u0631\u0622\u0645\u062f \u06a9\u0646\u062a\u0631\u0644 \u0646\u0645\u06cc \u06a9\u0646\u0646\u062f.<\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u0627\u062f\u0639\u0627\u0647\u0627\u06cc\u06cc \u0627\u0632 \u0642\u0628\u06cc\u0644 &#8220;\u067e\u06cc\u0648\u0633\u062a\u0646 \u0622\u0647\u0633\u062a\u0647&#8221; \u06cc\u0627 &#8220;\u067e\u06cc\u0648\u0633\u062a\u0646 \u0628\u0647 \u0645\u0642\u06cc\u0627\u0633&#8221; \u0646\u06cc\u0633\u062a \u060c \u0627\u063a\u0644\u0628 \u0645\u0646 \u0631\u0627 \u0648\u0627\u062f\u0627\u0631 \u0645\u06cc \u06a9\u0646\u062f \u062a\u0627 \u0646\u0634\u0627\u0646 \u062f\u0647\u0645 \u06a9\u0647 \u0686\u06af\u0648\u0646\u0647 \u0645\u06cc \u062a\u0648\u0627\u0646 \u0631\u062f\u06cc\u0641 \u0647\u0627\u06cc \u06a9\u0627\u0631\u0622\u0645\u062f \u0631\u0627 \u062f\u0631 \u06cc\u06a9 \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 SQL (\u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u0645\u062b\u0627\u0644) \u067e\u06cc\u0648\u0633\u062a. \u0628\u0627 \u0627\u06cc\u0646 \u062d\u0627\u0644 \u060c \u062f\u0631\u06a9 \u06a9\u0627\u0631\u0628\u0631 \u0627\u0632 \u06a9\u0646\u062f\u06cc \u0628\u0627\u0642\u06cc \u0645\u0627\u0646\u062f\u0647 \u0627\u0633\u062a \u060c \u0648 \u06af\u0648\u0634 \u062f\u0627\u062f\u0646 \u0628\u0647 \u062a\u0648\u0633\u0639\u0647 \u062f\u0647\u0646\u062f\u06af\u0627\u0646 &hellip;<\/p>\n","protected":false},"author":2,"featured_media":104912,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[339],"tags":[],"class_list":["post-104911","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dev"],"_links":{"self":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts\/104911","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/comments?post=104911"}],"version-history":[{"count":0,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts\/104911\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/media\/104912"}],"wp:attachment":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/media?parent=104911"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/categories?post=104911"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/tags?post=104911"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}