{"id":109190,"date":"2025-05-16T08:46:16","date_gmt":"2025-05-16T05:16:16","guid":{"rendered":"https:\/\/nabfollower.com\/blog\/understanding-mariadb-indexes-a-battle-tested-engineers-guide-47ii\/"},"modified":"2025-05-16T08:46:16","modified_gmt":"2025-05-16T05:16:16","slug":"understanding-mariadb-indexes-a-battle-tested-engineers-guide-47ii","status":"publish","type":"post","link":"https:\/\/nabfollower.com\/blog\/understanding-mariadb-indexes-a-battle-tested-engineers-guide-47ii\/","title":{"rendered":"\u062f\u0631\u06a9 \u0634\u0627\u062e\u0635 \u0647\u0627\u06cc Mariadb: \u0631\u0627\u0647\u0646\u0645\u0627\u06cc \u0645\u0647\u0646\u062f\u0633 \u0622\u0632\u0645\u0627\u06cc\u0634 \u0634\u062f\u0647 \u062a\u0648\u0633\u0637 \u0646\u0628\u0631\u062f"},"content":{"rendered":"<div data-article-id=\"2492756\" id=\"article-body\">\n<p>\u0628\u0639\u062f \u0627\u0632 \u06af\u0630\u0631\u0627\u0646\u062f\u0646 \u0628\u062e\u0634 \u0628\u0647\u062a\u0631 \u06cc\u06a9 \u062f\u0647\u0647 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href=\"https:\/\/nabfollower.com\/blog\/understanding-mariadb-indexes-a-battle-tested-engineers-guide-47ii\/#%D8%B4%D8%A7%D8%AE%D8%B5_%D9%87%D8%A7%DB%8C_B-Tree_The_Workhorses\" >\u0634\u0627\u062e\u0635 \u0647\u0627\u06cc B-Tree (The Workhorses)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/nabfollower.com\/blog\/understanding-mariadb-indexes-a-battle-tested-engineers-guide-47ii\/#%D8%B4%D8%A7%D8%AE%D8%B5_%D9%87%D8%A7%DB%8C_%D9%87%D8%B4_%D8%B4%DB%8C%D8%A7%D8%B7%DB%8C%D9%86_%D8%B3%D8%B1%D8%B9%D8%AA\" >\u0634\u0627\u062e\u0635 \u0647\u0627\u06cc \u0647\u0634 (\u0634\u06cc\u0627\u0637\u06cc\u0646 \u0633\u0631\u0639\u062a)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" 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href=\"https:\/\/nabfollower.com\/blog\/understanding-mariadb-indexes-a-battle-tested-engineers-guide-47ii\/#%D8%A7%D8%B3%DA%A9%D9%86_%D9%81%D9%87%D8%B1%D8%B3%D8%AA_%D8%AF%D8%B1_%D9%85%D9%82%D8%A7%D8%A8%D9%84_%D8%A7%D8%B3%DA%A9%D9%86_%D8%AC%D8%AF%D9%88%D9%84\" >\u0627\u0633\u06a9\u0646 \u0641\u0647\u0631\u0633\u062a \u062f\u0631 \u0645\u0642\u0627\u0628\u0644 \u0627\u0633\u06a9\u0646 \u062c\u062f\u0648\u0644<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/nabfollower.com\/blog\/understanding-mariadb-indexes-a-battle-tested-engineers-guide-47ii\/#%D8%A7%D9%84%DA%AF%D9%88%D9%87%D8%A7%DB%8C_%D8%B9%D9%85%D9%84%DA%A9%D8%B1%D8%AF_%D8%B4%D8%A7%D8%AE%D8%B5_%D8%AF%D8%B1_%D8%AF%D9%86%DB%8C%D8%A7%DB%8C_%D9%88%D8%A7%D9%82%D8%B9%DB%8C\" >\u0627\u0644\u06af\u0648\u0647\u0627\u06cc \u0639\u0645\u0644\u06a9\u0631\u062f \u0634\u0627\u062e\u0635 \u062f\u0631 \u062f\u0646\u06cc\u0627\u06cc 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\u062f\u0647\u06cc\u062f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/nabfollower.com\/blog\/understanding-mariadb-indexes-a-battle-tested-engineers-guide-47ii\/#2_%D8%AA%D8%B1%D9%81%D9%86%D8%AF_%D9%81%D9%87%D8%B1%D8%B3%D8%AA_%D9%BE%D9%88%D8%B4%D8%B4\" >2. \u062a\u0631\u0641\u0646\u062f \u0641\u0647\u0631\u0633\u062a \u067e\u0648\u0634\u0634<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/nabfollower.com\/blog\/understanding-mariadb-indexes-a-battle-tested-engineers-guide-47ii\/#3_%D8%B4%D8%A7%D8%AE%D8%B5_%D9%87%D8%A7%DB%8C_%D9%BE%DB%8C%D8%B4%D9%88%D9%86%D8%AF_%D8%A8%D8%B1%D8%A7%DB%8C_%D8%B3%D8%AA%D9%88%D9%86%D9%87%D8%A7%DB%8C_%D8%B1%D8%B4%D8%AA%D9%87_%D8%A7%DB%8C\" >3. \u0634\u0627\u062e\u0635 \u0647\u0627\u06cc \u067e\u06cc\u0634\u0648\u0646\u062f \u0628\u0631\u0627\u06cc \u0633\u062a\u0648\u0646\u0647\u0627\u06cc \u0631\u0634\u062a\u0647 \u0627\u06cc<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/nabfollower.com\/blog\/understanding-mariadb-indexes-a-battle-tested-engineers-guide-47ii\/#%D8%A7%D8%B4%D8%AA%D8%A8%D8%A7%D9%87%D8%A7%D8%AA_%D9%81%D9%87%D8%B1%D8%B3%D8%AA_%D8%A8%D9%86%D8%AF%DB%8C_%D9%85%D8%B4%D8%AA%D8%B1%DA%A9_%D9%88_%D9%86%D8%AD%D9%88%D9%87_%D8%AC%D9%84%D9%88%DA%AF%DB%8C%D8%B1%DB%8C_%D8%A7%D8%B2_%D8%A2%D9%86%D9%87%D8%A7\" >\u0627\u0634\u062a\u0628\u0627\u0647\u0627\u062a \u0641\u0647\u0631\u0633\u062a \u0628\u0646\u062f\u06cc \u0645\u0634\u062a\u0631\u06a9 (\u0648 \u0646\u062d\u0648\u0647 \u062c\u0644\u0648\u06af\u06cc\u0631\u06cc \u0627\u0632 \u0622\u0646\u0647\u0627)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/nabfollower.com\/blog\/understanding-mariadb-indexes-a-battle-tested-engineers-guide-47ii\/#1_%D8%B3%D8%AA%D9%88%D9%86_%D9%BE%DB%8C%DA%86%DB%8C%D8%AF%D9%87_%D8%B4%D8%AF%D9%87\" >1. \u0633\u062a\u0648\u0646 \u067e\u06cc\u0686\u06cc\u062f\u0647 \u0634\u062f\u0647<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/nabfollower.com\/blog\/understanding-mariadb-indexes-a-battle-tested-engineers-guide-47ii\/#2_%D9%BE%DB%8C%D8%B4%D8%B1%D9%88_%D8%AF%D8%B1_%DA%A9%D8%A7%D8%B1%D8%AA%D9%87%D8%A7%DB%8C_%D9%88%D8%AD%D8%B4%DB%8C_%D9%85%D8%A7%D9%86%D9%86%D8%AF\" >2. \u067e\u06cc\u0634\u0631\u0648 \u062f\u0631 \u06a9\u0627\u0631\u062a\u0647\u0627\u06cc \u0648\u062d\u0634\u06cc \u0645\u0627\u0646\u0646\u062f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/nabfollower.com\/blog\/understanding-mariadb-indexes-a-battle-tested-engineers-guide-47ii\/#3_%D8%A7%D9%86%D9%88%D8%A7%D8%B9_%D8%AF%D8%A7%D8%AF%D9%87_%D9%87%D8%A7%DB%8C_%D9%86%D8%A7%D8%B3%D8%A7%D8%B2%DA%AF%D8%A7%D8%B1\" >3. \u0627\u0646\u0648\u0627\u0639 \u062f\u0627\u062f\u0647 \u0647\u0627\u06cc \u0646\u0627\u0633\u0627\u0632\u06af\u0627\u0631<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/nabfollower.com\/blog\/understanding-mariadb-indexes-a-battle-tested-engineers-guide-47ii\/#%D8%B3%D9%84%D8%A7%D9%85%D8%AA_%D8%B4%D8%A7%D8%AE%D8%B5_%D9%86%D8%B8%D8%A7%D8%B1%D8%AA\" >\u0633\u0644\u0627\u0645\u062a \u0634\u0627\u062e\u0635 \u0646\u0638\u0627\u0631\u062a<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/nabfollower.com\/blog\/understanding-mariadb-indexes-a-battle-tested-engineers-guide-47ii\/#%D8%AE%D8%B7_%D9%BE%D8%A7%DB%8C%DB%8C%D9%86\" >\u062e\u0637 \u067e\u0627\u06cc\u06cc\u0646<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"%D9%81%D9%87%D8%B1%D8%B3%D8%AA_%D9%87%D8%A7_%D9%88%D8%A7%D9%82%D8%B9%D8%A7%D9%8B_%DA%86%DB%8C%D8%B3%D8%AA%D8%9F\"><\/span>\n<p>  \u0641\u0647\u0631\u0633\u062a \u0647\u0627 \u0648\u0627\u0642\u0639\u0627\u064b \u0686\u06cc\u0633\u062a\u061f<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0628\u0647 \u06cc\u06a9 \u0641\u0647\u0631\u0633\u062a \u0645\u0627\u0646\u0646\u062f \u06a9\u0627\u062a\u0627\u0644\u0648\u06af \u06a9\u0627\u0631\u062a \u062f\u0631 \u06cc\u06a9 \u06a9\u062a\u0627\u0628\u062e\u0627\u0646\u0647 \u0642\u062f\u06cc\u0645\u06cc \u0641\u06a9\u0631 \u06a9\u0646\u06cc\u062f (\u0627\u06af\u0631 \u0628\u0647 \u0627\u0646\u062f\u0627\u0632\u0647 \u06a9\u0627\u0641\u06cc \u062c\u0648\u0627\u0646 \u0647\u0633\u062a\u06cc\u062f \u06a9\u0647 \u0647\u0631\u06af\u0632 \u0622\u0646 \u0631\u0627 \u0646\u062f\u06cc\u062f\u0647 \u0627\u06cc\u062f \u060c \u06cc\u06a9 \u0633\u06cc\u0633\u062a\u0645 \u0646\u0634\u0627\u0646\u0647 \u06af\u0630\u0627\u0631\u06cc \u0628\u0633\u06cc\u0627\u0631 \u0633\u0627\u0632\u0645\u0627\u0646 \u06cc\u0627\u0641\u062a\u0647 \u0631\u0627 \u062a\u0635\u0648\u0631 \u06a9\u0646\u06cc\u062f). \u0628\u0647 \u062c\u0627\u06cc \u0627\u0633\u06a9\u0646 \u0647\u0631 \u06a9\u062a\u0627\u0628 \u0628\u0631\u0627\u06cc \u06cc\u0627\u0641\u062a\u0646 &#8220;JavaScript: The Good Parts&#8221; \u060c \u06a9\u0627\u062a\u0627\u0644\u0648\u06af \u0631\u0627 \u0628\u0631\u0631\u0633\u06cc \u0645\u06cc \u06a9\u0646\u06cc\u062f \u060c \u0645\u06a9\u0627\u0646 \u062f\u0642\u06cc\u0642 \u0631\u0627 \u062f\u0631\u06cc\u0627\u0641\u062a \u0645\u06cc \u06a9\u0646\u06cc\u062f \u0648 \u0645\u0633\u062a\u0642\u06cc\u0645 \u0628\u0647 \u0633\u0645\u062a \u0622\u0646 \u0645\u06cc \u0631\u0648\u06cc\u062f.<\/p>\n<p>\u062f\u0631 MariaDB \u060c \u06cc\u06a9 \u0641\u0647\u0631\u0633\u062a \u06cc\u06a9 \u0633\u0627\u062e\u062a\u0627\u0631 \u062f\u0627\u062f\u0647 \u062c\u062f\u0627\u06af\u0627\u0646\u0647 \u0627\u0633\u062a \u06a9\u0647 \u0646\u0634\u0627\u0646\u06af\u0631\u0647\u0627 \u0631\u0627 \u0628\u0647 \u0631\u062f\u06cc\u0641 \u0647\u0627\u06cc \u062c\u062f\u0648\u0644 \u0648\u0627\u0642\u0639\u06cc \u060c \u06a9\u0647 \u062a\u0648\u0633\u0637 \u0645\u0642\u0627\u062f\u06cc\u0631 \u0633\u062a\u0648\u0646 \u0641\u0647\u0631\u0633\u062a \u0628\u0646\u062f\u06cc \u0634\u062f\u0647 \u0637\u0628\u0642\u0647 \u0628\u0646\u062f\u06cc \u0645\u06cc \u0634\u0648\u062f \u060c \u062d\u0641\u0638 \u0645\u06cc \u06a9\u0646\u062f. \u0648\u0642\u062a\u06cc \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0645\u06cc \u06a9\u0646\u06cc\u062f <code>WHERE user_id = 12345<\/code>\u060c \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0628\u0647 \u062c\u0627\u06cc \u0627\u0633\u06a9\u0646 \u0645\u06cc\u0644\u06cc\u0648\u0646 \u0647\u0627 \u0631\u06a9\u0648\u0631\u062f \u060c \u0645\u0633\u062a\u0642\u06cc\u0645\u0627\u064b \u0628\u0647 \u0631\u062f\u06cc\u0641 \u0647\u0627\u06cc \u0645\u0631\u0628\u0648\u0637\u0647 \u067e\u0631\u0634 \u06a9\u0646\u062f.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%D8%B7%D8%B9%D9%85_%D9%87%D8%A7%DB%8C_%D9%85%D8%AE%D8%AA%D9%84%D9%81_%D8%A7%DB%8C%D9%86%D8%AF%DA%A9%D8%B3\"><\/span>\n<p>  \u0637\u0639\u0645 \u0647\u0627\u06cc \u0645\u062e\u062a\u0644\u0641 \u0627\u06cc\u0646\u062f\u06a9\u0633<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"%D8%B4%D8%A7%D8%AE%D8%B5_%D9%87%D8%A7%DB%8C_B-Tree_The_Workhorses\"><\/span>\n<p>  \u0634\u0627\u062e\u0635 \u0647\u0627\u06cc B-Tree (The Workhorses)<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0634\u0627\u062e\u0635 \u0647\u0627\u06cc \u062f\u0631\u062e\u062a B \u067e\u06cc\u0634 \u0641\u0631\u0636 \u0648 \u0631\u0627\u06cc\u062c \u062a\u0631\u06cc\u0646 \u0646\u0648\u0639 \u062f\u0631 Mariadb \u0647\u0633\u062a\u0646\u062f. \u0622\u0646\u0647\u0627 \u062f\u0631\u062e\u062a\u0627\u0646 \u0645\u062a\u0639\u0627\u062f\u0644 \u0647\u0633\u062a\u0646\u062f \u06a9\u0647 \u062f\u0627\u062f\u0647 \u0647\u0627 \u0628\u0647 \u062a\u0631\u062a\u06cc\u0628 \u0645\u0631\u062a\u0628 \u0634\u062f\u0647 \u0630\u062e\u06cc\u0631\u0647 \u0645\u06cc \u0634\u0648\u0646\u062f \u0648 \u0633\u0631\u06cc\u0639\u0627\u064b \u0646\u0645\u0627\u06cc\u0634 \u062f\u0627\u062f\u0647 \u0634\u062f.<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"k\">CREATE<\/span> <span class=\"k\">INDEX<\/span> <span class=\"n\">idx_created_at<\/span> <span class=\"k\">ON<\/span> <span class=\"n\">orders<\/span> <span class=\"p\">(<\/span><span class=\"n\">created_at<\/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><strong>\u0648\u0642\u062a\u06cc \u0645\u06cc \u062f\u0631\u062e\u0634\u0646\u062f:<\/strong><\/p>\n<ul>\n<li>\u062c\u0633\u062a\u062c\u0648\u0647\u0627\u06cc \u0628\u0631\u0627\u0628\u0631\u06cc: <code>WHERE id = 123<\/code>\n<\/li>\n<li>\u0646\u0645\u0627\u06cc\u0634 \u062f\u0627\u062f\u0647 \u0634\u062f\u06af\u0627\u0646: <code>WHERE created_at BETWEEN '2023-01-01' AND '2023-12-31'<\/code>\n<\/li>\n<li>\u0633\u0641\u0627\u0631\u0634 \u062a\u0648\u0633\u0637 \u0639\u0645\u0644\u06cc\u0627\u062a<\/li>\n<li>\u06af\u0631\u0648\u0647 \u0628\u0631 \u0627\u0633\u0627\u0633 \u0639\u0645\u0644\u06cc\u0627\u062a<\/li>\n<\/ul>\n<p><strong>GOTCHA \u062f\u0631 \u062f\u0646\u06cc\u0627\u06cc \u0648\u0627\u0642\u0639\u06cc:<\/strong> \u0645\u0646 \u06cc\u06a9 \u0628\u0627\u0631 \u0633\u0627\u0639\u062a \u0647\u0627 \u0635\u0631\u0641 \u0628\u0647\u06cc\u0646\u0647 \u06a9\u0631\u062f\u0646 \u06cc\u06a9 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u06a9\u0647 \u0628\u0647 \u0637\u0648\u0631 \u063a\u06cc\u0631 \u0642\u0627\u0628\u0644 \u062a\u0648\u0636\u06cc\u062d \u0622\u0647\u0633\u062a\u0647 \u0628\u0648\u062f \u060c \u0641\u0642\u0637 \u0628\u0631\u0627\u06cc \u06a9\u0634\u0641 \u06a9\u0633\u06cc \u06a9\u0647 \u06cc\u06a9 \u0634\u0627\u062e\u0635 \u0631\u0627 \u0627\u06cc\u062c\u0627\u062f \u06a9\u0631\u062f\u0647 \u0628\u0648\u062f <code>LOWER(email)<\/code> \u0627\u0645\u0627 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u06cc \u06a9\u0631\u062f <code>email<\/code> \u0645\u0633\u062a\u0642\u06cc\u0645. \u0627\u06cc\u0646 \u0634\u0627\u062e\u0635 \u062f\u0631 \u0622\u0646\u062c\u0627 \u0628\u0648\u062f \u060c \u0641\u0642\u0637 \u0628\u0631\u0627\u06cc \u0622\u0646 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0628\u06cc \u0641\u0627\u06cc\u062f\u0647 \u0628\u0648\u062f.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%D8%B4%D8%A7%D8%AE%D8%B5_%D9%87%D8%A7%DB%8C_%D9%87%D8%B4_%D8%B4%DB%8C%D8%A7%D8%B7%DB%8C%D9%86_%D8%B3%D8%B1%D8%B9%D8%AA\"><\/span>\n<p>  \u0634\u0627\u062e\u0635 \u0647\u0627\u06cc \u0647\u0634 (\u0634\u06cc\u0627\u0637\u06cc\u0646 \u0633\u0631\u0639\u062a)<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0634\u0627\u062e\u0635 \u0647\u0627\u06cc \u0647\u0634 \u0627\u0632 \u06cc\u06a9 \u062a\u0627\u0628\u0639 \u0647\u0634 \u0628\u0631\u0627\u06cc \u062a\u0631\u0633\u06cc\u0645 \u0645\u0642\u0627\u062f\u06cc\u0631 \u0628\u0647 \u0645\u06a9\u0627\u0646 \u0647\u0627\u06cc \u0633\u0637\u0644 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u06cc \u06a9\u0646\u0646\u062f. \u0622\u0646\u0647\u0627 \u0628\u0631\u0627\u06cc \u0645\u0633\u0627\u0628\u0642\u0627\u062a \u062f\u0642\u06cc\u0642 \u0628\u0633\u06cc\u0627\u0631 \u0633\u0631\u06cc\u0639 \u0647\u0633\u062a\u0646\u062f \u0627\u0645\u0627 \u0628\u0631\u0627\u06cc \u0647\u0631 \u0686\u06cc\u0632 \u062f\u06cc\u06af\u0631\u06cc \u0628\u06cc \u0641\u0627\u06cc\u062f\u0647 \u0647\u0633\u062a\u0646\u062f.<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"k\">CREATE<\/span> <span class=\"k\">INDEX<\/span> <span class=\"n\">idx_hash_user_id<\/span> <span class=\"k\">ON<\/span> <span class=\"n\">sessions<\/span> <span class=\"p\">(<\/span><span class=\"n\">user_id<\/span><span class=\"p\">)<\/span> <span class=\"k\">USING<\/span> <span class=\"n\">HASH<\/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><strong>\u0627\u06cc\u062f\u0647 \u0622\u0644 \u0628\u0631\u0627\u06cc:<\/strong><\/p>\n<ul>\n<li>\u0628\u0631\u0627\u0628\u0631\u06cc \u062f\u0642\u06cc\u0642: <code>WHERE user_id = 123<\/code>\n<\/li>\n<li>\u0633\u062a\u0648\u0646\u0647\u0627\u06cc \u0645\u0631\u0628\u0648\u0637 \u0628\u0647 \u0633\u0627\u06cc\u062a \u0628\u0627\u0644\u0627 \u0628\u0627 \u062c\u0633\u062a\u062c\u0648\u0647\u0627\u06cc \u0628\u06cc\u0634\u062a\u0631 \u0628\u0631\u0627\u0628\u0631\u06cc<\/li>\n<\/ul>\n<p><strong>\u0628\u0631\u0627\u06cc:<\/strong><\/p>\n<ul>\n<li>\u0646\u0645\u0627\u06cc\u0634 \u062f\u0627\u062f\u0647 \u0634\u062f\u06af\u0627\u0646 (\u0622\u0646\u0647\u0627 \u0646\u0627\u062f\u06cc\u062f\u0647 \u06af\u0631\u0641\u062a\u0647 \u0645\u06cc \u0634\u0648\u0646\u062f)<\/li>\n<li>\u062a\u0637\u0628\u06cc\u0642 \u0627\u0644\u06af\u0648\u06cc<\/li>\n<li>\u0639\u0645\u0644\u06cc\u0627\u062a \u0645\u0631\u062a\u0628 \u0633\u0627\u0632\u06cc<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"%D8%B4%D8%A7%D8%AE%D8%B5_%D9%87%D8%A7%DB%8C_%DA%A9%D8%A7%D9%85%D9%BE%D9%88%D8%B2%DB%8C%D8%AA_%DA%86%D9%86%D8%AF_%D8%A7%D8%A8%D8%B2%D8%A7%D8%B1\"><\/span>\n<p>  \u0634\u0627\u062e\u0635 \u0647\u0627\u06cc \u06a9\u0627\u0645\u067e\u0648\u0632\u06cc\u062a (\u0686\u0646\u062f \u0627\u0628\u0632\u0627\u0631)<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0627\u06cc\u0646 \u0634\u0627\u062e\u0635 \u0647\u0627\u06cc \u0645\u062e\u062a\u0644\u0641 \u0628\u0627 \u0647\u0645. \u0627\u06cc\u0646 \u0633\u0641\u0627\u0631\u0634 \u0628\u0647 \u0637\u0631\u0632 \u0686\u0634\u0645\u06af\u06cc\u0631\u06cc \u0627\u0647\u0645\u06cc\u062a \u062f\u0627\u0631\u062f &#8211; \u0645\u0627\u0646\u0646\u062f \u06cc\u06a9 \u06a9\u062a\u0627\u0628 \u062a\u0644\u0641\u0646\u06cc \u0627\u0633\u062a \u06a9\u0647 \u0628\u0627 \u0646\u0627\u0645 \u062e\u0627\u0646\u0648\u0627\u062f\u06af\u06cc \u0645\u0631\u062a\u0628 \u0634\u062f\u0647 \u0627\u0633\u062a \u060c \u0633\u067e\u0633 \u0646\u0627\u0645 \u0627\u0648\u0644.<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"k\">CREATE<\/span> <span class=\"k\">INDEX<\/span> <span class=\"n\">idx_user_status_created<\/span> <span class=\"k\">ON<\/span> <span class=\"n\">orders<\/span> <span class=\"p\">(<\/span><span class=\"n\">user_id<\/span><span class=\"p\">,<\/span> <span class=\"n\">status<\/span><span class=\"p\">,<\/span> <span class=\"n\">created_at<\/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>\u0627\u06cc\u0646 \u0634\u0627\u062e\u0635 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0628\u0647 \u0637\u0648\u0631 \u0645\u0624\u062b\u0631 \u06a9\u0646\u062a\u0631\u0644 \u06a9\u0646\u062f:<\/p>\n<ul>\n<li><code>WHERE user_id = 123<\/code><\/li>\n<li><code>WHERE user_id = 123 AND status=\"completed\"<\/code><\/li>\n<li><code>WHERE user_id = 123 AND status=\"completed\" AND created_at &gt; '2023-01-01'<\/code><\/li>\n<\/ul>\n<p>\u0627\u0645\u0627 \u0628\u0631\u0627\u06cc:<\/p>\n<ul>\n<li>\n<code>WHERE status=\"completed\"<\/code>  (\u0641\u0642\u0637 \u0633\u062a\u0648\u0646 \u062f\u0648\u0645)<\/li>\n<li>\n<code>WHERE created_at &gt; '2023-01-01'<\/code>  (\u0641\u0642\u0637 \u0633\u062a\u0648\u0646 \u0633\u0648\u0645)<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"%DA%86%DA%AF%D9%88%D9%86%D9%87_Mariadb_%D8%A7%D8%B2_%D9%81%D9%87%D8%B1%D8%B3%D8%AA_%D9%87%D8%A7%DB%8C_%D8%AF%D8%A7%D8%AE%D9%84%DB%8C_%D8%A7%D8%B3%D8%AA%D9%81%D8%A7%D8%AF%D9%87_%D9%85%DB%8C_%DA%A9%D9%86%D8%AF\"><\/span>\n<p>  \u0686\u06af\u0648\u0646\u0647 Mariadb \u0627\u0632 \u0641\u0647\u0631\u0633\u062a \u0647\u0627\u06cc \u062f\u0627\u062e\u0644\u06cc \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u06cc \u06a9\u0646\u062f<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"%D8%B1%D9%88%D9%86%D8%AF_%D8%AA%D8%B5%D9%85%DB%8C%D9%85_%DA%AF%DB%8C%D8%B1%DB%8C_%D8%A8%D9%87%DB%8C%D9%86%D9%87_%D8%B3%D8%A7%D8%B2_%D9%BE%D8%B1%D8%B3_%D9%88_%D8%AC%D9%88\"><\/span>\n<p>  \u0631\u0648\u0646\u062f \u062a\u0635\u0645\u06cc\u0645 \u06af\u06cc\u0631\u06cc \u0628\u0647\u06cc\u0646\u0647 \u0633\u0627\u0632 \u067e\u0631\u0633 \u0648 \u062c\u0648<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0647\u0646\u06af\u0627\u0645\u06cc \u06a9\u0647 \u0634\u0645\u0627 \u06cc\u06a9 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0631\u0627 \u0627\u062c\u0631\u0627 \u0645\u06cc \u06a9\u0646\u06cc\u062f \u060c \u0628\u0647\u06cc\u0646\u0647 \u0633\u0627\u0632 Mariadb \u0622\u0646\u0686\u0647 \u0631\u0627 \u06a9\u0647 \u062f\u0648\u0633\u062a \u062f\u0627\u0631\u0645 \u0622\u0646 \u0631\u0627 &#8220;\u0627\u0631\u0632\u06cc\u0627\u0628\u06cc \u0634\u0627\u062e\u0635 \u0639\u0627\u0644\u06cc&#8221; \u0628\u0646\u0627\u0645\u0645 \u060c \u0637\u06cc \u0645\u06cc \u06a9\u0646\u062f. \u0646\u06af\u0627\u0647 \u0645\u06cc \u06a9\u0646\u062f:<\/p>\n<ol>\n<li>\n<strong>\u0641\u0647\u0631\u0633\u062a \u0647\u0627\u06cc \u0645\u0648\u062c\u0648\u062f<\/strong> \u062f\u0631 \u062c\u062f\u0627\u0648\u0644 \u067e\u0631\u0633\u06cc\u062f\u0647 \u0634\u062f\u0647<\/li>\n<li>\n<strong>\u06a9\u0627\u0631\u062f\u06cc\u0646\u0627\u0644<\/strong> (\u0645\u0642\u0627\u062f\u06cc\u0631 \u0686\u0642\u062f\u0631 \u0628\u06cc \u0646\u0638\u06cc\u0631 \u0647\u0633\u062a\u0646\u062f)<\/li>\n<li>\n<strong>\u0622\u0645\u0627\u0631<\/strong> \u062f\u0631\u0628\u0627\u0631\u0647 \u062a\u0648\u0632\u06cc\u0639 \u062f\u0627\u062f\u0647 \u0647\u0627<\/li>\n<li>\n<strong>\u0627\u0646\u062a\u062e\u0627\u0628 \u067e\u0631\u0633 \u0648 \u062c\u0648<\/strong> (\u0686\u0646\u062f \u0631\u062f\u06cc\u0641 \u0627\u0646\u062a\u0638\u0627\u0631 \u0628\u0627\u0632\u06af\u0634\u062a \u062f\u0627\u0631\u062f)<\/li>\n<\/ol>\n<p>\u062f\u0631 \u0627\u06cc\u0646\u062c\u0627 \u06cc\u06a9 \u0646\u0633\u062e\u0647 \u0633\u0627\u062f\u0647 \u0627\u0632 \u0622\u0646\u0686\u0647 \u0627\u062a\u0641\u0627\u0642 \u0645\u06cc \u0627\u0641\u062a\u062f \u0622\u0648\u0631\u062f\u0647 \u0634\u062f\u0647 \u0627\u0633\u062a:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"k\">EXPLAIN<\/span> <span class=\"k\">SELECT<\/span> <span class=\"o\">*<\/span> <span class=\"k\">FROM<\/span> <span class=\"n\">users<\/span> <span class=\"k\">WHERE<\/span> <span class=\"n\">age<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">25<\/span> <span class=\"k\">AND<\/span> <span class=\"n\">city<\/span> <span class=\"o\">=<\/span> <span class=\"s1\">'New York'<\/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\u0647\u06cc\u0646\u0647 \u0633\u0627\u0632 \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u0628\u06cc\u0646:<\/p>\n<ul>\n<li>\u0627\u0633\u06a9\u0646 \u062c\u062f\u0648\u0644 \u06a9\u0627\u0645\u0644<\/li>\n<li>\u0641\u0647\u0631\u0633\u062a <code>age<\/code>\n<\/li>\n<li>\u0641\u0647\u0631\u0633\u062a <code>city<\/code>\n<\/li>\n<li>\u0634\u0627\u062e\u0635 \u06a9\u0627\u0645\u067e\u0648\u0632\u06cc\u062a \u062f\u0631 <code>(city, age)<\/code>\n<\/li>\n<li>\u0627\u062f\u063a\u0627\u0645 \u0641\u0647\u0631\u0633\u062a \u0628\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0647\u0631 \u062f\u0648 \u0634\u0627\u062e\u0635 \u062a\u06a9 \u0633\u062a\u0648\u0646\u06cc<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"%D8%A7%D8%B3%DA%A9%D9%86_%D9%81%D9%87%D8%B1%D8%B3%D8%AA_%D8%AF%D8%B1_%D9%85%D9%82%D8%A7%D8%A8%D9%84_%D8%A7%D8%B3%DA%A9%D9%86_%D8%AC%D8%AF%D9%88%D9%84\"><\/span>\n<p>  \u0627\u0633\u06a9\u0646 \u0641\u0647\u0631\u0633\u062a \u062f\u0631 \u0645\u0642\u0627\u0628\u0644 \u0627\u0633\u06a9\u0646 \u062c\u062f\u0648\u0644<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u062f\u0631 <strong>\u0641\u0647\u0631\u0633\u062a \u0641\u0647\u0631\u0633\u062a<\/strong> \u0633\u0627\u062e\u062a\u0627\u0631 \u0634\u0627\u062e\u0635 \u0631\u0627 \u0628\u0631\u0627\u06cc \u06cc\u0627\u0641\u062a\u0646 \u0631\u062f\u06cc\u0641 \u0647\u0627\u06cc \u062a\u0637\u0628\u06cc\u0642 \u0645\u06cc \u062e\u0648\u0627\u0646\u062f \u060c \u0633\u067e\u0633 \u062f\u0627\u062f\u0647 \u0647\u0627\u06cc \u0648\u0627\u0642\u0639\u06cc \u0631\u0627 \u0648\u0627\u06af\u0630\u0627\u0631 \u0645\u06cc \u06a9\u0646\u062f. \u0628\u0648\u0647\u0627 <strong>\u062c\u062f\u0648\u0644 \u0627\u0633\u06a9\u0646<\/strong> \u0647\u0631 \u0631\u062f\u06cc\u0641 \u062c\u062f\u0648\u0644 \u0631\u0627 \u0645\u06cc \u062e\u0648\u0627\u0646\u062f. <\/p>\n<p>\u0646\u0642\u0637\u0647 \u0627\u0648\u062c\u061f \u0645\u0639\u0645\u0648\u0644\u0627\u064b \u062d\u062f\u0648\u062f 10-30 \u066a \u062c\u062f\u0648\u0644. \u0627\u06af\u0631 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0634\u0645\u0627 \u0628\u0647 40 \u066a \u0627\u0632 \u0631\u062f\u06cc\u0641 \u0647\u0627 \u0627\u062d\u062a\u06cc\u0627\u062c \u062f\u0627\u0631\u062f \u060c Mariadb \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u0627\u06cc\u0646 \u0634\u0627\u062e\u0635 \u0631\u0627 \u06a9\u0627\u0645\u0644\u0627\u064b \u067e\u0631\u0634 \u06a9\u0646\u062f \u0632\u06cc\u0631\u0627 \u062e\u0648\u0627\u0646\u062f\u0646 \u06a9\u0644 \u062c\u062f\u0648\u0644 \u0628\u0647 \u0637\u0648\u0631 \u0645\u062a\u0648\u0627\u0644\u06cc \u0633\u0631\u06cc\u0639\u062a\u0631 \u0627\u0632 \u062a\u0646\u062f\u0631\u0633\u062a \u0628\u06cc\u0646 \u0641\u0647\u0631\u0633\u062a \u0648 \u062c\u062f\u0648\u0644 \u0628\u0631\u0627\u06cc \u0645\u06cc\u0644\u06cc\u0648\u0646 \u0647\u0627 \u0631\u062f\u06cc\u0641 \u0627\u0633\u062a.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%D8%A7%D9%84%DA%AF%D9%88%D9%87%D8%A7%DB%8C_%D8%B9%D9%85%D9%84%DA%A9%D8%B1%D8%AF_%D8%B4%D8%A7%D8%AE%D8%B5_%D8%AF%D8%B1_%D8%AF%D9%86%DB%8C%D8%A7%DB%8C_%D9%88%D8%A7%D9%82%D8%B9%DB%8C\"><\/span>\n<p>  \u0627\u0644\u06af\u0648\u0647\u0627\u06cc \u0639\u0645\u0644\u06a9\u0631\u062f \u0634\u0627\u062e\u0635 \u062f\u0631 \u062f\u0646\u06cc\u0627\u06cc \u0648\u0627\u0642\u0639\u06cc<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"%D8%B3%D9%86%D8%AF%D8%B1%D9%85_%E2%80%9C%D9%87%D9%85%D9%87_%DA%86%DB%8C%D8%B2_%D8%A2%D9%87%D8%B3%D8%AA%D9%87_%D8%A7%D8%B3%D8%AA%E2%80%9D\"><\/span>\n<p>  \u0633\u0646\u062f\u0631\u0645 &#8220;\u0647\u0645\u0647 \u0686\u06cc\u0632 \u0622\u0647\u0633\u062a\u0647 \u0627\u0633\u062a&#8221;<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0645\u0646 \u0627\u06cc\u0646 \u0627\u0644\u06af\u0648\u06cc \u0631\u0627 \u062f\u0647 \u0647\u0627 \u0628\u0627\u0631 \u062f\u06cc\u062f\u0647 \u0627\u0645: \u0639\u0645\u0644\u06a9\u0631\u062f \u0628\u0631\u0646\u0627\u0645\u0647 \u0628\u0647 \u062a\u062f\u0631\u06cc\u062c \u0637\u06cc \u0645\u0627\u0647 \u0647\u0627 \u062a\u062e\u0631\u06cc\u0628 \u0645\u06cc \u0634\u0648\u062f. \u0645\u0642\u0635\u0631\u061f \u0634\u0627\u062e\u0635 \u0647\u0627\u06cc \u0627\u0632 \u062f\u0633\u062a \u0631\u0641\u062a\u0647 \u062f\u0631 \u062c\u062f\u0627\u0648\u0644 \u062f\u0631 \u062d\u0627\u0644 \u0631\u0634\u062f \u0647\u0645\u0631\u0627\u0647 \u0628\u0627 \u0646\u0645\u0627\u06cc\u0634 \u062f\u0627\u062f\u0647 \u0647\u0627\u06cc \u0641\u0632\u0627\u06cc\u0646\u062f\u0647 \u067e\u06cc\u0686\u06cc\u062f\u0647.<\/p>\n<p><strong>\u0639\u0644\u0627\u0626\u0645:<\/strong><\/p>\n<ul>\n<li>\u0646\u0645\u0627\u06cc\u0634 \u062f\u0627\u062f\u0647 \u0634\u062f\u06cc \u06a9\u0647 \u0628\u0627 \u0631\u062f\u06cc\u0641 \u0647\u0627\u06cc 10K \u0633\u0631\u06cc\u0639 \u0628\u0648\u062f \u0628\u0627 1 \u0645\u062a\u0631+ \u0631\u062f\u06cc\u0641 \u062e\u0632\u0646\u062f\u0647 \u0627\u0633\u062a<\/li>\n<li>\u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0628\u0627\u0644\u0627\u06cc CPU \u062f\u0631 \u0633\u0627\u0639\u0627\u062a \u06a9\u0627\u0631\u06cc<\/li>\n<li>\u06a9\u0627\u0631\u0628\u0631\u0627\u0646 \u0627\u0632 &#8220;\u0628\u0631\u0646\u0627\u0645\u0647 \u06a9\u0646\u062f \u0628\u0648\u062f\u0646 \u0628\u0631\u0646\u0627\u0645\u0647&#8221; \u0634\u06a9\u0627\u06cc\u062a \u0645\u06cc \u06a9\u0646\u0646\u062f<\/li>\n<\/ul>\n<p><strong>\u0631\u0648\u06cc\u06a9\u0631\u062f \u0631\u0627\u0647 \u062d\u0644:<\/strong><\/p>\n<ol>\n<li>\u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0631\u062f\u0646 <code>SHOW PROCESSLIST<\/code> \u0628\u0631\u0627\u06cc \u06cc\u0627\u0641\u062a\u0646 \u0646\u0645\u0627\u06cc\u0634 \u062f\u0627\u062f\u0647 \u0647\u0627\u06cc \u062f\u0631 \u062d\u0627\u0644 \u0627\u062c\u0631\u0627<\/li>\n<li>\n<code>EXPLAIN<\/code>  \u0622\u0647\u0633\u062a\u0647<\/li>\n<li>\u0628\u0647 \u062f\u0646\u0628\u0627\u0644 \u0627\u0633\u06a9\u0646 \u0645\u06cc\u0632 \u0631\u0648\u06cc \u0645\u06cc\u0632\u0647\u0627\u06cc \u0628\u0632\u0631\u06af \u0628\u0627\u0634\u06cc\u062f<\/li>\n<li>\u0641\u0647\u0631\u0633\u062a \u0647\u0627\u06cc \u0645\u0646\u0627\u0633\u0628 \u0631\u0627 \u0627\u0636\u0627\u0641\u0647 \u06a9\u0646\u06cc\u062f<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"%D9%85%D8%B4%DA%A9%D9%84_%D8%A8%DB%8C%D8%B4_%D8%A7%D8%B2_%D8%AD%D8%AF_%D8%B4%D8%A7%D8%AE%D8%B5\"><\/span>\n<p>  \u0645\u0634\u06a9\u0644 \u0628\u06cc\u0634 \u0627\u0632 \u062d\u062f \u0634\u0627\u062e\u0635<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0634\u0627\u062e\u0635 \u0647\u0627\u06cc \u0628\u06cc\u0634\u062a\u0631 \u0647\u0645\u06cc\u0634\u0647 \u0628\u0647 \u0645\u0639\u0646\u0627\u06cc \u0639\u0645\u0644\u06a9\u0631\u062f \u0628\u0647\u062a\u0631 \u0646\u06cc\u0633\u062a. \u0645\u0646 \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u0647\u0627 \u0631\u0627 \u0628\u0627 15+ \u0634\u0627\u062e\u0635 \u062f\u0631 \u06cc\u06a9 \u062c\u062f\u0648\u0644 \u0648\u0627\u062d\u062f \u06a9\u0647 \u0641\u0642\u0637 3 \u0645\u0648\u0631\u062f \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0634\u062f\u0647 \u0627\u0633\u062a \u060c \u062d\u0633\u0627\u0628\u0631\u0633\u06cc \u06a9\u0631\u062f\u0647 \u0627\u0645.<\/p>\n<p><strong>\u0647\u0632\u06cc\u0646\u0647 \u0647\u0627\u06cc \u067e\u0646\u0647\u0627\u0646:<\/strong><\/p>\n<ul>\n<li>\u0647\u0631 \u062f\u0631\u062c\/\u0628\u0647 \u0631\u0648\u0632 \u0631\u0633\u0627\u0646\u06cc\/\u062d\u0630\u0641 \u0647\u0645\u0647 \u0641\u0647\u0631\u0633\u062a \u0647\u0627 \u0631\u0627 \u062d\u0641\u0638 \u0645\u06cc \u06a9\u0646\u062f<\/li>\n<li>\u0641\u0636\u0627\u06cc \u0630\u062e\u06cc\u0631\u0647 \u0633\u0627\u0632\u06cc \u0628\u06cc\u0634\u062a\u0631<\/li>\n<li>\u0632\u0645\u0627\u0646 \u067e\u0634\u062a\u06cc\u0628\u0627\u0646 \u06af\u06cc\u0631\u06cc \u0637\u0648\u0644\u0627\u0646\u06cc \u062a\u0631<\/li>\n<li>\u062a\u0639\u0645\u06cc\u0631 \u0648 \u0646\u06af\u0647\u062f\u0627\u0631\u06cc \u0634\u0627\u062e\u0635 \u0628\u0627\u0644\u0627\u06cc \u0633\u0631<\/li>\n<\/ul>\n<p><strong>\u0642\u0627\u0646\u0648\u0646 \u0634\u0633\u062a \u0645\u0646:<\/strong> \u0627\u06af\u0631 \u06cc\u06a9 \u0634\u0627\u062e\u0635 \u062a\u0648\u0633\u0637 \u0647\u0631 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u062f\u0631 \u0648\u0631\u0648\u062f \u0628\u0647 \u0633\u06cc\u0633\u062a\u0645 Querd Query \u062f\u0631 \u0637\u06cc \u06cc\u06a9 \u0645\u0627\u0647 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0646\u0645\u06cc \u0634\u0648\u062f \u060c \u062f\u0631 \u0646\u0638\u0631 \u0628\u06af\u06cc\u0631\u06cc\u062f \u06a9\u0647 \u0622\u0646 \u0631\u0627 \u0631\u0647\u0627 \u06a9\u0646\u06cc\u062f.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%D9%86%DA%A9%D8%A7%D8%AA_%D8%A8%D9%87%DB%8C%D9%86%D9%87_%D8%B3%D8%A7%D8%B2%DB%8C_%D8%B4%D8%A7%D8%AE%D8%B5_%D8%B9%D9%85%D9%84%DB%8C\"><\/span>\n<p>  \u0646\u06a9\u0627\u062a \u0628\u0647\u06cc\u0646\u0647 \u0633\u0627\u0632\u06cc \u0634\u0627\u062e\u0635 \u0639\u0645\u0644\u06cc<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"1_%D8%A7%D8%B3%D8%AA%D9%81%D8%A7%D8%AF%D9%87_%D8%B1%D8%A7_%D8%A8%D9%87_%D9%86%D9%81%D8%B9_%D8%AE%D9%88%D8%AF_%D8%AA%D9%88%D8%B6%DB%8C%D8%AD_%D8%AF%D9%87%DB%8C%D8%AF\"><\/span>\n<p>  1. \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0631\u0627 \u0628\u0647 \u0646\u0641\u0639 \u062e\u0648\u062f \u062a\u0648\u0636\u06cc\u062d \u062f\u0647\u06cc\u062f<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"k\">EXPLAIN<\/span> <span class=\"n\">FORMAT<\/span><span class=\"o\">=<\/span><span class=\"n\">JSON<\/span> <span class=\"k\">SELECT<\/span> <span class=\"o\">*<\/span> <span class=\"k\">FROM<\/span> <span class=\"n\">orders<\/span> \n<span class=\"k\">WHERE<\/span> <span class=\"n\">customer_id<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">123<\/span> <span class=\"k\">AND<\/span> <span class=\"n\">status<\/span> <span class=\"o\">=<\/span> <span class=\"s1\">'pending'<\/span>\n<span class=\"k\">ORDER<\/span> <span class=\"k\">BY<\/span> <span class=\"n\">created_at<\/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\u0647 \u062f\u0646\u0628\u0627\u0644:<\/p>\n<ul>\n<li>\n<code>\"type\": \"ALL\"<\/code>  (\u0627\u0633\u06a9\u0646 \u062c\u062f\u0648\u0644 &#8211; \u0645\u0639\u0645\u0648\u0644\u0627\u064b \u0628\u062f)<\/li>\n<li>\n<code>\"Extra\": \"Using filesort\"<\/code>  (\u0645\u0631\u062a\u0628 \u0633\u0627\u0632\u06cc \u0628\u062f\u0648\u0646 \u0641\u0647\u0631\u0633\u062a)<\/li>\n<li>\n<code>\"Extra\": \"Using temporary\"<\/code>  (\u0627\u06cc\u062c\u0627\u062f \u062c\u062f\u0648\u0644 \u062f\u0645\u0627)<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"2_%D8%AA%D8%B1%D9%81%D9%86%D8%AF_%D9%81%D9%87%D8%B1%D8%B3%D8%AA_%D9%BE%D9%88%D8%B4%D8%B4\"><\/span>\n<p>  2. \u062a\u0631\u0641\u0646\u062f \u0641\u0647\u0631\u0633\u062a \u067e\u0648\u0634\u0634<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u06cc\u06a9 \u0641\u0647\u0631\u0633\u062a \u067e\u0648\u0634\u0634 \u0634\u0627\u0645\u0644 \u062a\u0645\u0627\u0645 \u0633\u062a\u0648\u0646 \u0647\u0627\u06cc \u0645\u0648\u0631\u062f \u0646\u06cc\u0627\u0632 \u06cc\u06a9 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0627\u0633\u062a:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"c1\">-- Query only needs id, customer_id, status, total<\/span>\n<span class=\"k\">CREATE<\/span> <span class=\"k\">INDEX<\/span> <span class=\"n\">idx_covering<\/span> <span class=\"k\">ON<\/span> <span class=\"n\">orders<\/span> <span class=\"p\">(<\/span><span class=\"n\">customer_id<\/span><span class=\"p\">,<\/span> <span class=\"n\">status<\/span><span class=\"p\">,<\/span> <span class=\"n\">id<\/span><span class=\"p\">,<\/span> <span class=\"n\">total<\/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>\u0627\u06cc\u0646 \u0628\u0647 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0627\u062c\u0627\u0632\u0647 \u0645\u06cc \u062f\u0647\u062f \u062a\u0627 \u0628\u062f\u0648\u0646 \u062f\u0633\u062a \u0632\u062f\u0646 \u0628\u0647 \u062f\u0627\u062f\u0647 \u0647\u0627\u06cc \u062c\u062f\u0648\u0644 \u060c \u0628\u0647 \u0637\u0648\u0631 \u06a9\u0627\u0645\u0644 \u0627\u0632 \u0641\u0647\u0631\u0633\u062a \u0627\u062c\u0631\u0627 \u0634\u0648\u062f-\u0622\u0646\u0686\u0647 \u0645\u0627 \u0622\u0646 \u0631\u0627 &#8220;\u0627\u0633\u06a9\u0646 \u0641\u0642\u0637 \u0634\u0627\u062e\u0635&#8221; \u0645\u06cc \u0646\u0627\u0645\u06cc\u0645.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"3_%D8%B4%D8%A7%D8%AE%D8%B5_%D9%87%D8%A7%DB%8C_%D9%BE%DB%8C%D8%B4%D9%88%D9%86%D8%AF_%D8%A8%D8%B1%D8%A7%DB%8C_%D8%B3%D8%AA%D9%88%D9%86%D9%87%D8%A7%DB%8C_%D8%B1%D8%B4%D8%AA%D9%87_%D8%A7%DB%8C\"><\/span>\n<p>  3. \u0634\u0627\u062e\u0635 \u0647\u0627\u06cc \u067e\u06cc\u0634\u0648\u0646\u062f \u0628\u0631\u0627\u06cc \u0633\u062a\u0648\u0646\u0647\u0627\u06cc \u0631\u0634\u062a\u0647 \u0627\u06cc<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0628\u0631\u0627\u06cc \u0633\u062a\u0648\u0646 \u0647\u0627\u06cc \u0631\u0634\u062a\u0647 \u0627\u06cc \u0637\u0648\u0644\u0627\u0646\u06cc \u060c \u0634\u0645\u0627 \u0627\u063a\u0644\u0628 \u0646\u06cc\u0627\u0632\u06cc \u0628\u0647 \u0641\u0647\u0631\u0633\u062a \u0628\u0646\u062f\u06cc \u06a9\u0644 \u0645\u0642\u062f\u0627\u0631 \u0646\u062f\u0627\u0631\u06cc\u062f:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"c1\">-- Index only the first 10 characters<\/span>\n<span class=\"k\">CREATE<\/span> <span class=\"k\">INDEX<\/span> <span class=\"n\">idx_email_prefix<\/span> <span class=\"k\">ON<\/span> <span class=\"n\">users<\/span> <span class=\"p\">(<\/span><span class=\"n\">email<\/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>\u0627\u06cc\u0646 \u0628\u0647 \u062e\u0648\u0628\u06cc \u0628\u0631\u0627\u06cc \u062f\u0627\u0645\u0646\u0647 \u0647\u0627\u06cc \u0627\u06cc\u0645\u06cc\u0644 \u060c URL \u0647\u0627 \u06cc\u0627 \u0647\u0631 \u0631\u0634\u062a\u0647 \u0627\u06cc \u06a9\u0647 \u067e\u06cc\u0634\u0648\u0646\u062f \u0627\u0632 \u0627\u0646\u062a\u062e\u0627\u0628 \u062e\u0648\u0628\u06cc \u0628\u0631\u062e\u0648\u0631\u062f\u0627\u0631 \u0628\u0627\u0634\u062f \u060c \u06a9\u0627\u0631 \u0645\u06cc \u06a9\u0646\u062f.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%D8%A7%D8%B4%D8%AA%D8%A8%D8%A7%D9%87%D8%A7%D8%AA_%D9%81%D9%87%D8%B1%D8%B3%D8%AA_%D8%A8%D9%86%D8%AF%DB%8C_%D9%85%D8%B4%D8%AA%D8%B1%DA%A9_%D9%88_%D9%86%D8%AD%D9%88%D9%87_%D8%AC%D9%84%D9%88%DA%AF%DB%8C%D8%B1%DB%8C_%D8%A7%D8%B2_%D8%A2%D9%86%D9%87%D8%A7\"><\/span>\n<p>  \u0627\u0634\u062a\u0628\u0627\u0647\u0627\u062a \u0641\u0647\u0631\u0633\u062a \u0628\u0646\u062f\u06cc \u0645\u0634\u062a\u0631\u06a9 (\u0648 \u0646\u062d\u0648\u0647 \u062c\u0644\u0648\u06af\u06cc\u0631\u06cc \u0627\u0632 \u0622\u0646\u0647\u0627)<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"1_%D8%B3%D8%AA%D9%88%D9%86_%D9%BE%DB%8C%DA%86%DB%8C%D8%AF%D9%87_%D8%B4%D8%AF%D9%87\"><\/span>\n<p>  1. \u0633\u062a\u0648\u0646 \u067e\u06cc\u0686\u06cc\u062f\u0647 \u0634\u062f\u0647<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"c1\">-- Bad: Index on created_at won't be used<\/span>\n<span class=\"k\">WHERE<\/span> <span class=\"nb\">YEAR<\/span><span class=\"p\">(<\/span><span class=\"n\">created_at<\/span><span class=\"p\">)<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">2023<\/span>\n\n<span class=\"c1\">-- Good: Rewrite to use the index<\/span>\n<span class=\"k\">WHERE<\/span> <span class=\"n\">created_at<\/span> <span class=\"o\">&gt;=<\/span> <span class=\"s1\">'2023-01-01'<\/span> <span class=\"k\">AND<\/span> <span class=\"n\">created_at<\/span> <span class=\"o\">&lt;<\/span> <span class=\"s1\">'2024-01-01'<\/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<h3><span class=\"ez-toc-section\" id=\"2_%D9%BE%DB%8C%D8%B4%D8%B1%D9%88_%D8%AF%D8%B1_%DA%A9%D8%A7%D8%B1%D8%AA%D9%87%D8%A7%DB%8C_%D9%88%D8%AD%D8%B4%DB%8C_%D9%85%D8%A7%D9%86%D9%86%D8%AF\"><\/span>\n<p>  2. \u067e\u06cc\u0634\u0631\u0648 \u062f\u0631 \u06a9\u0627\u0631\u062a\u0647\u0627\u06cc \u0648\u062d\u0634\u06cc \u0645\u0627\u0646\u0646\u062f<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"c1\">-- Index won't help<\/span>\n<span class=\"k\">WHERE<\/span> <span class=\"n\">email<\/span> <span class=\"k\">LIKE<\/span> <span class=\"s1\">'%@gmail.com'<\/span>\n\n<span class=\"c1\">-- Index can help<\/span>\n<span class=\"k\">WHERE<\/span> <span class=\"n\">email<\/span> <span class=\"k\">LIKE<\/span> <span class=\"s1\">'john%'<\/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<h3><span class=\"ez-toc-section\" id=\"3_%D8%A7%D9%86%D9%88%D8%A7%D8%B9_%D8%AF%D8%A7%D8%AF%D9%87_%D9%87%D8%A7%DB%8C_%D9%86%D8%A7%D8%B3%D8%A7%D8%B2%DA%AF%D8%A7%D8%B1\"><\/span>\n<p>  3. \u0627\u0646\u0648\u0627\u0639 \u062f\u0627\u062f\u0647 \u0647\u0627\u06cc \u0646\u0627\u0633\u0627\u0632\u06af\u0627\u0631<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"c1\">-- If user_id is INT, this won't use the index<\/span>\n<span class=\"k\">WHERE<\/span> <span class=\"n\">user_id<\/span> <span class=\"o\">=<\/span> <span class=\"s1\">'123'<\/span>\n\n<span class=\"c1\">-- This will<\/span>\n<span class=\"k\">WHERE<\/span> <span class=\"n\">user_id<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">123<\/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<h2><span class=\"ez-toc-section\" id=\"%D8%B3%D9%84%D8%A7%D9%85%D8%AA_%D8%B4%D8%A7%D8%AE%D8%B5_%D9%86%D8%B8%D8%A7%D8%B1%D8%AA\"><\/span>\n<p>  \u0633\u0644\u0627\u0645\u062a \u0634\u0627\u062e\u0635 \u0646\u0638\u0627\u0631\u062a<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Meriadb \u0645\u062f\u0631\u0646 \u0627\u0628\u0632\u0627\u0631\u0647\u0627\u06cc \u0639\u0627\u0644\u06cc \u0628\u0631\u0627\u06cc \u062a\u062c\u0632\u06cc\u0647 \u0648 \u062a\u062d\u0644\u06cc\u0644 \u0634\u0627\u062e\u0635 \u0641\u0631\u0627\u0647\u0645 \u0645\u06cc \u06a9\u0646\u062f:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"c1\">-- Find unused indexes<\/span>\n<span class=\"k\">SELECT<\/span> <span class=\"o\">*<\/span> <span class=\"k\">FROM<\/span> <span class=\"n\">information_schema<\/span><span class=\"p\">.<\/span><span class=\"n\">INDEX_STATISTICS<\/span> \n<span class=\"k\">WHERE<\/span> <span class=\"k\">CARDINALITY<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">0<\/span><span class=\"p\">;<\/span>\n\n<span class=\"c1\">-- Check index cardinality<\/span>\n<span class=\"k\">SHOW<\/span> <span class=\"k\">INDEX<\/span> <span class=\"k\">FROM<\/span> <span class=\"n\">your_table<\/span><span class=\"p\">;<\/span>\n\n<span class=\"c1\">-- Analyze index usage<\/span>\n<span class=\"k\">SELECT<\/span> <span class=\"o\">*<\/span> <span class=\"k\">FROM<\/span> <span class=\"n\">performance_schema<\/span><span class=\"p\">.<\/span><span class=\"n\">table_io_waits_summary_by_index_usage<\/span>\n<span class=\"k\">WHERE<\/span> <span class=\"n\">OBJECT_SCHEMA<\/span> <span class=\"o\">=<\/span> <span class=\"s1\">'your_database'<\/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<h2><span class=\"ez-toc-section\" id=\"%D8%AE%D8%B7_%D9%BE%D8%A7%DB%8C%DB%8C%D9%86\"><\/span>\n<p>  \u062e\u0637 \u067e\u0627\u06cc\u06cc\u0646<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0627\u06cc\u0646\u062f\u06a9\u0633 \u0647\u0627 \u0627\u0628\u0632\u0627\u0631\u0647\u0627\u06cc \u0642\u062f\u0631\u062a\u0645\u0646\u062f\u06cc \u0647\u0633\u062a\u0646\u062f \u060c \u0627\u0645\u0627 \u0645\u0627\u0646\u0646\u062f \u0647\u0631 \u0627\u0628\u0632\u0627\u0631\u06cc \u060c \u0622\u0646\u0647\u0627 \u0628\u0627\u06cc\u062f \u0639\u0627\u0642\u0644\u0627\u0646\u0647 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0634\u0648\u0646\u062f. \u062a\u0648\u0635\u06cc\u0647 \u0645\u0646 \u0628\u0639\u062f \u0627\u0632 \u0633\u0627\u0644\u0647\u0627 \u0645\u062f\u06cc\u0631\u06cc\u062a \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u062a\u0648\u0644\u06cc\u062f:<\/p>\n<ol>\n<li>\n<strong>\u0633\u0627\u062f\u0647 \u0634\u0631\u0648\u0639 \u06a9\u0646\u06cc\u062f<\/strong> &#8211; \u0627\u0636\u0627\u0641\u0647 \u06a9\u0631\u062f\u0646 \u0634\u0627\u062e\u0635 \u0647\u0627 \u0628\u0631 \u0627\u0633\u0627\u0633 \u0627\u0644\u06af\u0648\u0647\u0627\u06cc \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0648\u0627\u0642\u0639\u06cc \u060c \u0646\u0647 \u0641\u0631\u0636\u06cc\u0647 \u0647\u0627\u06cc \u0641\u0631\u0636\u06cc<\/li>\n<li>\n<strong>\u0646\u0638\u0627\u0631\u062a \u0641\u0639\u0627\u0644<\/strong> &#8211; \u0627\u0632 \u0633\u06cc\u0627\u0647\u0647\u0647\u0627\u06cc \u0645\u0631\u0628\u0648\u0637 \u0628\u0647 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0648 \u0637\u0631\u062d \u0639\u0645\u0644\u06a9\u0631\u062f \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f<\/li>\n<li>\n<strong>\u06a9\u0627\u0645\u0644\u0627\u064b \u0622\u0632\u0645\u0648\u0646<\/strong> &#8211; \u062a\u063a\u06cc\u06cc\u0631\u0627\u062a \u0634\u0627\u062e\u0635 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0627\u062b\u0631\u0627\u062a \u063a\u06cc\u0631 \u0645\u0646\u062a\u0638\u0631\u0647 \u0627\u06cc \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u062f<\/li>\n<li>\n<strong>\u0628\u0647 \u0637\u0648\u0631 \u0645\u0631\u062a\u0628 \u062e\u0627\u0646\u0647 \u062a\u0645\u06cc\u0632<\/strong> &#8211; \u0641\u0647\u0631\u0633\u062a \u0647\u0627\u06cc \u0628\u0644\u0627\u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0631\u0627 \u0628\u0647 \u0635\u0648\u0631\u062a \u062f\u0648\u0631\u0647 \u0627\u06cc \u062d\u0630\u0641 \u06a9\u0646\u06cc\u062f<\/li>\n<\/ol>\n<p>\u0628\u0647 \u06cc\u0627\u062f \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u06cc\u062f \u060c \u0628\u0647\u062a\u0631\u06cc\u0646 \u0627\u0633\u062a\u0631\u0627\u062a\u0698\u06cc \u0634\u0627\u062e\u0635 \u0645\u0648\u0636\u0648\u0639\u06cc \u0627\u0633\u062a \u06a9\u0647 \u0628\u0627 \u0628\u0631\u0646\u0627\u0645\u0647 \u0634\u0645\u0627 \u062a\u06a9\u0627\u0645\u0644 \u0645\u06cc \u06cc\u0627\u0628\u062f. \u0622\u0646\u0686\u0647 \u0628\u0631\u0627\u06cc \u0631\u062f\u06cc\u0641 \u0647\u0627\u06cc 100K \u06a9\u0627\u0631 \u0645\u06cc \u06a9\u0646\u062f \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u0628\u0631\u0627\u06cc 100 \u0645\u062a\u0631 \u0631\u062f\u06cc\u0641 \u06a9\u0627\u0631 \u0646\u06a9\u0646\u062f \u060c \u0648 \u0628\u0627 \u067e\u06cc\u0686\u06cc\u062f\u0647 \u062a\u0631 \u0634\u062f\u0646 \u0633\u0624\u0627\u0644\u0627\u062a \u0634\u0645\u0627 \u060c \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u0646\u06cc\u0627\u0632 \u0628\u0647 \u062a\u062c\u062f\u06cc\u062f \u0646\u0638\u0631 \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u062f.<\/p>\n<p>\u0647\u062f\u0641 \u0627\u06cc\u0646 \u0646\u06cc\u0633\u062a \u06a9\u0647 \u0628\u06cc\u0634\u062a\u0631\u06cc\u0646 \u0634\u0627\u062e\u0635 \u0647\u0627 \u0631\u0627 \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u06cc\u062f &#8211; \u0627\u06cc\u0646 \u0627\u0633\u062a \u06a9\u0647 \u0634\u0627\u062e\u0635 \u0647\u0627\u06cc \u0645\u0646\u0627\u0633\u0628 \u0628\u0631\u0627\u06cc \u062d\u062c\u0645 \u06a9\u0627\u0631 \u062e\u0627\u0635 \u062e\u0648\u062f \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u06cc\u062f. \u0648 \u06af\u0627\u0647\u06cc \u0627\u0648\u0642\u0627\u062a \u060c \u067e\u0627\u0633\u062e \u062f\u0631\u0633\u062a \u0628\u0647 \u0647\u06cc\u0686 \u0648\u062c\u0647 \u0634\u0627\u062e\u0635 \u0646\u06cc\u0633\u062a \u060c \u0641\u0642\u0637 \u0633\u062e\u062a \u0627\u0641\u0632\u0627\u0631 \u0628\u0647\u062a\u0631 \u06cc\u0627 \u0628\u0627\u0632\u0646\u0648\u06cc\u0633\u06cc \u067e\u0631\u0633 \u0648 \u062c\u0648.<\/p>\n<p>\u0646\u0645\u0627\u06cc\u0647 \u0633\u0627\u0632\u06cc \u0645\u0628\u0627\u0631\u06a9 \u060c \u0648 \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u0633\u0624\u0627\u0644\u0627\u062a \u0634\u0645\u0627 \u0647\u0645\u06cc\u0634\u0647 \u062f\u0631 \u0645\u06cc\u0644\u06cc \u062b\u0627\u0646\u06cc\u0647 \u0628\u0627\u0632\u06af\u0631\u062f\u062f!<\/p>\n<hr\/>\n<p><em>\u0622\u06cc\u0627 \u0628\u0627 \u0686\u0627\u0644\u0634 \u0647\u0627\u06cc \u062c\u0627\u0644\u0628 \u062a\u0648\u062c\u0647 \u062f\u0631 MariaDB \u0631\u0648\u0628\u0631\u0648 \u0634\u062f\u0647 \u0627\u06cc\u062f\u061f \u062f\u0627\u0633\u062a\u0627\u0646\u0647\u0627\u06cc \u062c\u0646\u06af \u062e\u0648\u062f \u0631\u0627 \u062f\u0631 \u0646\u0638\u0631\u0627\u062a \u0632\u06cc\u0631 \u0628\u0647 \u0627\u0634\u062a\u0631\u0627\u06a9 \u0628\u06af\u0630\u0627\u0631\u06cc\u062f.<\/em><\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u0628\u0639\u062f \u0627\u0632 \u06af\u0630\u0631\u0627\u0646\u062f\u0646 \u0628\u062e\u0634 \u0628\u0647\u062a\u0631 \u06cc\u06a9 \u062f\u0647\u0647 \u0627\u0634\u06a9\u0627\u0644 \u0632\u062f\u0627\u06cc\u06cc \u062f\u0631 \u067e\u0631\u0633 \u0648 \u062c\u0648\u0647\u0627\u06cc \u0622\u0647\u0633\u062a\u0647 \u062f\u0631 \u0633\u0627\u0639\u062a 3 \u0635\u0628\u062d \u0648 \u062a\u0645\u0627\u0634\u0627\u06cc \u062a\u0648\u0633\u0639\u0647 \u062f\u0647\u0646\u062f\u06af\u0627\u0646 \u0633\u0631 \u062e\u0648\u062f \u0631\u0627 \u0628\u0631 \u0631\u0648\u06cc \u0628\u0631\u0646\u0627\u0645\u0647 \u0647\u0627\u06cc \u0627\u0639\u062f\u0627\u0645 \u062e\u0631\u0627\u0634\u06cc\u062f\u0647 \u0627\u0645 \u060c \u0645\u0646 \u0622\u0645\u0648\u062e\u062a\u0647 \u0627\u0645 \u06a9\u0647 \u0627\u06cc\u0646\u062f\u06a9\u0633 \u0647\u0627 \u0645\u0627\u0646\u0646\u062f \u0622\u0646 \u062f\u0648\u0633\u062a \u0642\u0627\u0628\u0644 \u0627\u0639\u062a\u0645\u0627\u062f \u0647\u0633\u062a\u0646\u062f \u06a9\u0647 \u0647\u0645\u06cc\u0634\u0647 \u0645\u06cc \u062f\u0627\u0646\u062f \u0647\u0645\u0647 \u0686\u06cc\u0632 \u06a9\u062c\u0627\u0633\u062a &#8211; \u0645\u06af\u0631 \u0627\u06cc\u0646\u06a9\u0647 &hellip;<\/p>\n","protected":false},"author":2,"featured_media":109191,"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-109190","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\/109190","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=109190"}],"version-history":[{"count":0,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts\/109190\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/media\/109191"}],"wp:attachment":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/media?parent=109190"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/categories?post=109190"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/tags?post=109190"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}