{"id":78700,"date":"2024-10-16T12:12:16","date_gmt":"2024-10-16T04:12:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/78700\/"},"modified":"2024-10-16T12:12:16","modified_gmt":"2024-10-16T04:12:16","slug":"mysql%e6%8c%87%e4%bb%a4-index%ef%bc%88%e7%b4%a2%e5%bc%95%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/78700\/","title":{"rendered":"MySQL\u6307\u4ee4: INDEX\uff08\u7d22\u5f15\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-index%ef%bc%88%e7%b4%a2%e5%bc%95%ef%bc%89-FWmXuoehdR\">MySQL\u6307\u4ee4: INDEX\uff08\u7d22\u5f15\uff09<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u7d22\u5f15\u662f\u4e00\u7a2e\u91cd\u8981\u7684\u6578\u64da\u7d50\u69cb\uff0c\u7528\u65bc\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002MySQL\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u958b\u6e90\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u7d22\u5f15\u985e\u578b\u548c\u6307\u4ee4\uff0c\u5e6b\u52a9\u7528\u6236\u512a\u5316\u6578\u64da\u6aa2\u7d22\u7684\u901f\u5ea6\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eMySQL\u4e2d\u7684INDEX\u6307\u4ee4\u53ca\u5176\u61c9\u7528\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e7%b4%a2%e5%bc%95%ef%bc%9f-FWmXuoehdR\">\u4ec0\u9ebc\u662f\u7d22\u5f15\uff1f<\/h2>\n<p>\u7d22\u5f15\u662f\u4e00\u7a2e\u6578\u64da\u7d50\u69cb\uff0c\u80fd\u5920\u52a0\u901f\u8cc7\u6599\u5eab\u67e5\u8a62\u7684\u904e\u7a0b\u3002\u5b83\u985e\u4f3c\u65bc\u66f8\u7c4d\u7684\u76ee\u9304\uff0c\u5e6b\u52a9\u7528\u6236\u5feb\u901f\u627e\u5230\u6240\u9700\u7684\u4fe1\u606f\u3002\u7576\u8cc7\u6599\u8868\u4e2d\u7684\u6578\u64da\u91cf\u589e\u5927\u6642\uff0c\u67e5\u8a62\u7684\u6548\u7387\u53ef\u80fd\u6703\u4e0b\u964d\uff0c\u9019\u6642\u5019\u7d22\u5f15\u5c31\u986f\u5f97\u5c24\u70ba\u91cd\u8981\u3002<\/p>\n<h2 id=\"index%e7%9a%84%e9%a1%9e%e5%9e%8b-FWmXuoehdR\">INDEX\u7684\u985e\u578b<\/h2>\n<p>MySQL\u652f\u6301\u591a\u7a2e\u7d22\u5f15\u985e\u578b\uff0c\u4e3b\u8981\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>B-Tree\u7d22\u5f15\uff1a<\/strong>\u9019\u662fMySQL\u4e2d\u6700\u5e38\u7528\u7684\u7d22\u5f15\u985e\u578b\uff0c\u9069\u7528\u65bc\u5927\u591a\u6578\u67e5\u8a62\u3002<\/li>\n<li><strong>\u54c8\u5e0c\u7d22\u5f15\uff1a<\/strong>\u4e3b\u8981\u7528\u65bc\u7b49\u503c\u67e5\u8a62\uff0c\u901f\u5ea6\u975e\u5e38\u5feb\uff0c\u4f46\u4e0d\u652f\u6301\u7bc4\u570d\u67e5\u8a62\u3002<\/li>\n<li><strong>\u5168\u6587\u7d22\u5f15\uff1a<\/strong>\u9069\u5408\u7528\u65bc\u6587\u672c\u641c\u7d22\uff0c\u80fd\u5920\u5feb\u901f\u67e5\u627e\u5305\u542b\u7279\u5b9a\u55ae\u8a5e\u7684\u8a18\u9304\u3002<\/li>\n<li><strong>\u7a7a\u9593\u7d22\u5f15\uff1a<\/strong>\u5c08\u9580\u7528\u65bc\u5730\u7406\u6578\u64da\u7684\u67e5\u8a62\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%89%b5%e5%bb%ba%e7%b4%a2%e5%bc%95-FWmXuoehdR\">\u5982\u4f55\u5275\u5efa\u7d22\u5f15<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528CREATE INDEX\u6307\u4ee4\u4f86\u5275\u5efa\u7d22\u5f15\u3002\u4ee5\u4e0b\u662f\u5275\u5efa\u7d22\u5f15\u7684\u57fa\u672c\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>CREATE INDEX index_name ON table_name (column_name);<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba\u201cusers\u201d\u7684\u8868\uff0c\u4e26\u5e0c\u671b\u5728\u201cemail\u201d\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u6307\u4ee4\uff1a<\/p>\n<pre><code>CREATE INDEX idx_email ON users (email);<\/code><\/pre>\n<h2 id=\"%e7%b4%a2%e5%bc%95%e7%9a%84%e5%84%aa%e5%8b%a2-FWmXuoehdR\">\u7d22\u5f15\u7684\u512a\u52e2<\/h2>\n<p>\u4f7f\u7528\u7d22\u5f15\u7684\u4e3b\u8981\u512a\u52e2\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>\u63d0\u9ad8\u67e5\u8a62\u901f\u5ea6\uff1a<\/strong>\u7d22\u5f15\u80fd\u5920\u986f\u8457\u6e1b\u5c11\u67e5\u8a62\u6240\u9700\u7684\u6642\u9593\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002<\/li>\n<li><strong>\u52a0\u901f\u6392\u5e8f\u548c\u7be9\u9078\uff1a<\/strong>\u7d22\u5f15\u53ef\u4ee5\u52a0\u901fORDER BY\u548cWHERE\u5b50\u53e5\u7684\u57f7\u884c\u3002<\/li>\n<li><strong>\u652f\u6301\u552f\u4e00\u6027\u7d04\u675f\uff1a<\/strong>\u7d22\u5f15\u53ef\u4ee5\u7528\u4f86\u5f37\u5236\u552f\u4e00\u6027\uff0c\u9632\u6b62\u91cd\u8907\u6578\u64da\u7684\u63d2\u5165\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b4%a2%e5%bc%95%e7%9a%84%e7%bc%ba%e9%bb%9e-FWmXuoehdR\">\u7d22\u5f15\u7684\u7f3a\u9ede<\/h2>\n<p>\u5118\u7ba1\u7d22\u5f15\u6709\u8a31\u591a\u512a\u52e2\uff0c\u4f46\u4e5f\u5b58\u5728\u4e00\u4e9b\u7f3a\u9ede\uff1a<\/p>\n<ul>\n<li><strong>\u589e\u52a0\u5b58\u5132\u7a7a\u9593\uff1a<\/strong>\u7d22\u5f15\u9700\u8981\u984d\u5916\u7684\u5b58\u5132\u7a7a\u9593\uff0c\u7279\u5225\u662f\u5728\u5927\u578b\u8868\u4e2d\u3002<\/li>\n<li><strong>\u5f71\u97ff\u5beb\u5165\u6027\u80fd\uff1a<\/strong>\u6bcf\u7576\u5c0d\u8868\u9032\u884c\u63d2\u5165\u3001\u66f4\u65b0\u6216\u522a\u9664\u64cd\u4f5c\u6642\uff0c\u7d22\u5f15\u4e5f\u9700\u8981\u66f4\u65b0\uff0c\u9019\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e7%ae%a1%e7%90%86%e7%b4%a2%e5%bc%95-FWmXuoehdR\">\u5982\u4f55\u7ba1\u7406\u7d22\u5f15<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528SHOW INDEX\u6307\u4ee4\u4f86\u67e5\u770b\u8868\u4e2d\u7684\u7d22\u5f15\u4fe1\u606f\uff1a<\/p>\n<pre><code>SHOW INDEX FROM table_name;<\/code><\/pre>\n<p>\u5982\u679c\u9700\u8981\u522a\u9664\u7d22\u5f15\uff0c\u53ef\u4ee5\u4f7f\u7528DROP INDEX\u6307\u4ee4\uff1a<\/p>\n<pre><code>DROP INDEX index_name ON table_name;<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-FWmXuoehdR\">\u7d50\u8ad6<\/h2>\n<p>\u7d22\u5f15\u5728MySQL\u4e2d\u626e\u6f14\u8457\u81f3\u95dc\u91cd\u8981\u7684\u89d2\u8272\uff0c\u80fd\u5920\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002\u4e86\u89e3\u5982\u4f55\u6b63\u78ba\u4f7f\u7528\u548c\u7ba1\u7406\u7d22\u5f15\uff0c\u5c0d\u65bc\u512a\u5316\u8cc7\u6599\u5eab\u6027\u80fd\u81f3\u95dc\u91cd\u8981\u3002\u7121\u8ad6\u662f\u958b\u767c\u8005\u9084\u662f\u8cc7\u6599\u5eab\u7ba1\u7406\u54e1\uff0c\u90fd\u61c9\u8a72\u719f\u6089\u7d22\u5f15\u7684\u4f7f\u7528\uff0c\u4ee5\u4fbf\u5728\u9762\u5c0d\u5927\u91cf\u6578\u64da\u6642\uff0c\u80fd\u5920\u6709\u6548\u5730\u9032\u884c\u67e5\u8a62\u548c\u7ba1\u7406\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u95dc\u65bc<code>VPS<\/code>\u3001<code>\u9999\u6e2fVPS<\/code>\u53ca\u5176\u4ed6<code>\u4f3a\u670d\u5668<\/code>\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9 <a href=\"https:\/\/server.hk\">Server.HK<\/a>\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u4e2d\u7684INDEX\uff08\u7d22\u5f15\uff09\u6307\u4ee4\uff0c\u63d0\u5347\u67e5\u8be2\u6548\u7387\uff0c\u4f18\u5316\u6570\u636e\u5e93\u6027\u80fd\uff0c\u786e\u4fdd\u6570\u636e\u68c0\u7d22\u5feb\u901f\u51c6\u786e\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-78700","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78700","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=78700"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78700\/revisions"}],"predecessor-version":[{"id":78701,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78700\/revisions\/78701"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=78700"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=78700"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=78700"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}