{"id":76736,"date":"2024-10-16T09:24:20","date_gmt":"2024-10-16T01:24:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/76736\/"},"modified":"2024-10-16T09:24:20","modified_gmt":"2024-10-16T01:24:20","slug":"mysql%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%b4%a2%e5%bc%95%e7%9a%84%e5%89%b5%e5%bb%ba%e8%88%87%e5%88%aa%e9%99%a4","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/76736\/","title":{"rendered":"MySQL\u6578\u64da\u5eab\u4e2d\u7d22\u5f15\u7684\u5275\u5efa\u8207\u522a\u9664"},"content":{"rendered":"<h1 id=\"mysql%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%b4%a2%e5%bc%95%e7%9a%84%e5%89%b5%e5%bb%ba%e8%88%87%e5%88%aa%e9%99%a4-FqEcEwIebb\">MySQL\u6578\u64da\u5eab\u4e2d\u7d22\u5f15\u7684\u5275\u5efa\u8207\u522a\u9664<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u7d22\u5f15\u662f\u4e00\u500b\u81f3\u95dc\u91cd\u8981\u7684\u6982\u5ff5\u3002\u5b83\u80fd\u5920\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eMySQL\u6578\u64da\u5eab\u4e2d\u7d22\u5f15\u7684\u5275\u5efa\u8207\u522a\u9664\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u5982\u4f55\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u5eab\u6027\u80fd\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e7%b4%a2%e5%bc%95%ef%bc%9f-FqEcEwIebb\">\u4ec0\u9ebc\u662f\u7d22\u5f15\uff1f<\/h2>\n<p>\u7d22\u5f15\u662f\u4e00\u7a2e\u6578\u64da\u7d50\u69cb\uff0c\u65e8\u5728\u52a0\u901f\u6578\u64da\u6aa2\u7d22\u64cd\u4f5c\u3002\u5b83\u985e\u4f3c\u65bc\u66f8\u7c4d\u7684\u76ee\u9304\uff0c\u80fd\u5920\u5e6b\u52a9\u6578\u64da\u5eab\u5feb\u901f\u5b9a\u4f4d\u5230\u6240\u9700\u7684\u6578\u64da\u884c\u3002MySQL\u652f\u6301\u591a\u7a2e\u7d22\u5f15\u985e\u578b\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>B-Tree\u7d22\u5f15\uff1a<\/strong>\u6700\u5e38\u7528\u7684\u7d22\u5f15\u985e\u578b\uff0c\u9069\u7528\u65bc\u7bc4\u570d\u67e5\u8a62\u3002<\/li>\n<li><strong>\u54c8\u5e0c\u7d22\u5f15\uff1a<\/strong>\u9069\u5408\u7cbe\u78ba\u67e5\u8a62\uff0c\u4f46\u4e0d\u652f\u6301\u7bc4\u570d\u67e5\u8a62\u3002<\/li>\n<li><strong>\u5168\u6587\u7d22\u5f15\uff1a<\/strong>\u5c08\u9580\u7528\u65bc\u6587\u672c\u641c\u7d22\u3002<\/li>\n<li><strong>\u7a7a\u9593\u7d22\u5f15\uff1a<\/strong>\u7528\u65bc\u5730\u7406\u6578\u64da\u7684\u67e5\u8a62\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%89%b5%e5%bb%ba%e7%b4%a2%e5%bc%95-FqEcEwIebb\">\u5275\u5efa\u7d22\u5f15<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u5275\u5efa\u7d22\u5f15\u7684\u8a9e\u6cd5\u76f8\u5c0d\u7c21\u55ae\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 (column1, column2, ...);<\/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\u547d\u4ee4\uff1a<\/p>\n<pre><code>CREATE INDEX idx_email ON users (email);<\/code><\/pre>\n<p>\u6b64\u5916\uff0cMySQL\u9084\u652f\u6301\u5728\u5275\u5efa\u8868\u6642\u540c\u6642\u5275\u5efa\u7d22\u5f15\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>CREATE TABLE users (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    email VARCHAR(255),\n    INDEX idx_email (email)\n);<\/code><\/pre>\n<h3 id=\"%e7%b4%a2%e5%bc%95%e7%9a%84%e9%a1%9e%e5%9e%8b-FqEcEwIebb\">\u7d22\u5f15\u7684\u985e\u578b<\/h3>\n<p>\u5728\u5275\u5efa\u7d22\u5f15\u6642\uff0c\u53ef\u4ee5\u9078\u64c7\u4e0d\u540c\u7684\u7d22\u5f15\u985e\u578b\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u5275\u5efa\u552f\u4e00\u7d22\u5f15\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>CREATE UNIQUE INDEX idx_unique_email ON users (email);<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u201cemail\u201d\u5217\u4e2d\u7684\u6bcf\u500b\u503c\u90fd\u662f\u552f\u4e00\u7684\uff0c\u5f9e\u800c\u907f\u514d\u91cd\u8907\u6578\u64da\u7684\u63d2\u5165\u3002<\/p>\n<h2 id=\"%e5%88%aa%e9%99%a4%e7%b4%a2%e5%bc%95-FqEcEwIebb\">\u522a\u9664\u7d22\u5f15<\/h2>\n<p>\u7576\u7d22\u5f15\u4e0d\u518d\u9700\u8981\u6216\u9700\u8981\u91cd\u65b0\u8a2d\u8a08\u6642\uff0c\u53ef\u4ee5\u5c07\u5176\u522a\u9664\u3002\u522a\u9664\u7d22\u5f15\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>DROP INDEX index_name ON table_name;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u522a\u9664\u4e4b\u524d\u5275\u5efa\u7684\u201cidx_email\u201d\u7d22\u5f15\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<pre><code>DROP INDEX idx_email ON users;<\/code><\/pre>\n<h3 id=\"%e7%b4%a2%e5%bc%95%e7%9a%84%e5%84%aa%e7%bc%ba%e9%bb%9e-FqEcEwIebb\">\u7d22\u5f15\u7684\u512a\u7f3a\u9ede<\/h3>\n<p>\u96d6\u7136\u7d22\u5f15\u80fd\u5920\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u4f46\u4e5f\u6709\u5176\u7f3a\u9ede\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u9700\u8981\u8003\u616e\u7684\u56e0\u7d20\uff1a<\/p>\n<ul>\n<li><strong>\u512a\u9ede\uff1a<\/strong>\u52a0\u901f\u67e5\u8a62\uff0c\u7279\u5225\u662f\u5728\u5927\u6578\u64da\u96c6\u4e0a\u3002<\/li>\n<li><strong>\u7f3a\u9ede\uff1a<\/strong>\u589e\u52a0\u6578\u64da\u63d2\u5165\u3001\u66f4\u65b0\u548c\u522a\u9664\u7684\u6642\u9593\uff0c\u56e0\u70ba\u7d22\u5f15\u9700\u8981\u4fdd\u6301\u540c\u6b65\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-FqEcEwIebb\">\u6700\u4f73\u5be6\u8e10<\/h2>\n<p>\u5728\u4f7f\u7528\u7d22\u5f15\u6642\uff0c\u9075\u5faa\u4e00\u4e9b\u6700\u4f73\u5be6\u8e10\u53ef\u4ee5\u5e6b\u52a9\u63d0\u9ad8\u6578\u64da\u5eab\u6027\u80fd\uff1a<\/p>\n<ul>\n<li>\u50c5\u5728\u7d93\u5e38\u67e5\u8a62\u7684\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\u3002<\/li>\n<li>\u907f\u514d\u5728\u4f4e\u57fa\u6578\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u4f8b\u5982\u6027\u5225\u6216\u5e03\u723e\u503c\u3002<\/li>\n<li>\u5b9a\u671f\u6aa2\u67e5\u548c\u512a\u5316\u7d22\u5f15\uff0c\u4ee5\u78ba\u4fdd\u5176\u6709\u6548\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-FqEcEwIebb\">\u7e3d\u7d50<\/h2>\n<p>\u5728MySQL\u6578\u64da\u5eab\u4e2d\uff0c\u7d22\u5f15\u7684\u5275\u5efa\u8207\u522a\u9664\u662f\u6578\u64da\u5eab\u7ba1\u7406\u7684\u91cd\u8981\u7d44\u6210\u90e8\u5206\u3002\u901a\u904e\u5408\u7406\u5730\u4f7f\u7528\u7d22\u5f15\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u5f9e\u800c\u63d0\u5347\u6574\u9ad4\u7cfb\u7d71\u7684\u6548\u7387\u3002\u4e86\u89e3\u5982\u4f55\u5275\u5efa\u548c\u522a\u9664\u7d22\u5f15\uff0c\u4e26\u9075\u5faa\u6700\u4f73\u5be6\u8e10\uff0c\u5c07\u6709\u52a9\u65bc\u7dad\u8b77\u4e00\u500b\u9ad8\u6548\u7684\u6578\u64da\u5eab\u74b0\u5883\u3002\u5982\u679c\u60a8\u5c0d\u65bcVPS\u6216\u5176\u4ed6\u76f8\u95dc\u670d\u52d9\u611f\u8208\u8da3\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4e86\u89e3\u66f4\u591a\u4fe1\u606f\uff0c\u63a2\u7d22\u6211\u5011\u7684<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u6578\u64da\u5eab\u4e2d\u7d22\u5f15\u7684\u5275\u5efa\u8207\u522a\u9664\u65b9\u6cd5\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\uff0c\u512a\u5316\u6578\u64da\u7ba1\u7406\uff0c\u78ba\u4fdd\u6027\u80fd\u6700\u4f73\u5316\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-76736","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76736","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=76736"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76736\/revisions"}],"predecessor-version":[{"id":76737,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76736\/revisions\/76737"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=76736"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=76736"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=76736"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}