{"id":195489,"date":"2024-11-13T15:25:21","date_gmt":"2024-11-13T07:25:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/195489\/"},"modified":"2024-11-13T15:25:22","modified_gmt":"2024-11-13T07:25:22","slug":"%e5%8e%9f%e4%be%86-mysql-%e7%b4%a2%e5%bc%95%e8%a6%81%e9%80%99%e9%ba%bc%e8%a8%ad%e8%a8%88%e6%89%8d%e8%83%bd%e8%b5%b7%e9%a3%9b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/195489\/","title":{"rendered":"\u539f\u4f86 MySQL \u7d22\u5f15\u8981\u9019\u9ebc\u8a2d\u8a08\u624d\u80fd\u8d77\u98db"},"content":{"rendered":"<h1 id=\"%e5%8e%9f%e4%be%86-mysql-%e7%b4%a2%e5%bc%95%e8%a6%81%e9%80%99%e9%ba%bc%e8%a8%ad%e8%a8%88%e6%89%8d%e8%83%bd%e8%b5%b7%e9%a3%9b-WbNiivCcTY\">\u539f\u4f86 MySQL \u7d22\u5f15\u8981\u9019\u9ebc\u8a2d\u8a08\u624d\u80fd\u8d77\u98db<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\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\u3002MySQL \u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u958b\u6e90\u6578\u64da\u5eab\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u7d22\u5f15\u985e\u578b\u548c\u8a2d\u8a08\u7b56\u7565\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u6709\u6548\u8a2d\u8a08 MySQL \u7d22\u5f15\uff0c\u4ee5\u9054\u5230\u6700\u4f73\u6027\u80fd\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-mysql-%e7%b4%a2%e5%bc%95%ef%bc%9f-WbNiivCcTY\">\u4ec0\u9ebc\u662f MySQL \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\u5e6b\u52a9\u6578\u64da\u5eab\u5feb\u901f\u5b9a\u4f4d\u6240\u9700\u7684\u6578\u64da\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\u548c\u6392\u5e8f\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>\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\u70ba\u5730\u7406\u6578\u64da\u8a2d\u8a08\uff0c\u652f\u6301\u7a7a\u9593\u67e5\u8a62\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b4%a2%e5%bc%95%e8%a8%ad%e8%a8%88%e7%9a%84%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-WbNiivCcTY\">\u7d22\u5f15\u8a2d\u8a08\u7684\u6700\u4f73\u5be6\u8e10<\/h2>\n<h3 id=\"1-%e7%a2%ba%e5%ae%9a%e7%b4%a2%e5%bc%95%e7%9a%84%e5%bf%85%e8%a6%81%e6%80%a7-WbNiivCcTY\">1. \u78ba\u5b9a\u7d22\u5f15\u7684\u5fc5\u8981\u6027<\/h3>\n<p>\u5728\u8a2d\u8a08\u7d22\u5f15\u4e4b\u524d\uff0c\u9996\u5148\u8981\u8a55\u4f30\u5176\u5fc5\u8981\u6027\u3002\u904e\u591a\u7684\u7d22\u5f15\u6703\u5c0e\u81f4\u5beb\u5165\u6027\u80fd\u4e0b\u964d\uff0c\u56e0\u70ba\u6bcf\u6b21\u63d2\u5165\u3001\u66f4\u65b0\u6216\u522a\u9664\u64cd\u4f5c\u90fd\u9700\u8981\u66f4\u65b0\u7d22\u5f15\u3002\u56e0\u6b64\uff0c\u61c9\u8a72\u6839\u64da\u67e5\u8a62\u7684\u983b\u7387\u548c\u985e\u578b\u4f86\u6c7a\u5b9a\u662f\u5426\u9700\u8981\u7d22\u5f15\u3002<\/p>\n<h3 id=\"2-%e9%81%b8%e6%93%87%e5%90%88%e9%81%a9%e7%9a%84%e5%88%97%e9%80%b2%e8%a1%8c%e7%b4%a2%e5%bc%95-WbNiivCcTY\">2. \u9078\u64c7\u5408\u9069\u7684\u5217\u9032\u884c\u7d22\u5f15<\/h3>\n<p>\u9078\u64c7\u7d22\u5f15\u5217\u6642\uff0c\u61c9\u8003\u616e\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u7d93\u5e38\u7528\u65bc\u67e5\u8a62\u689d\u4ef6\u7684\u5217\uff08WHERE \u5b50\u53e5\uff09<\/li>\n<li>\u7d93\u5e38\u7528\u65bc\u6392\u5e8f\u7684\u5217\uff08ORDER BY \u5b50\u53e5\uff09<\/li>\n<li>\u7d93\u5e38\u7528\u65bc\u806f\u63a5\u7684\u5217\uff08JOIN \u5b50\u53e5\uff09<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u5047\u8a2d\u6709\u4e00\u500b\u7528\u6236\u8868\uff0c\u7d93\u5e38\u6839\u64da\u7528\u6236\u540d\u67e5\u8a62\uff0c\u5247\u53ef\u4ee5\u5728\u7528\u6236\u540d\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\uff1a<\/p>\n<pre><code>CREATE INDEX idx_username ON users(username);<\/code><\/pre>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8%e8%a4%87%e5%90%88%e7%b4%a2%e5%bc%95-WbNiivCcTY\">3. \u4f7f\u7528\u8907\u5408\u7d22\u5f15<\/h3>\n<p>\u7576\u67e5\u8a62\u6d89\u53ca\u591a\u500b\u5217\u6642\uff0c\u4f7f\u7528\u8907\u5408\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6027\u80fd\u3002\u8907\u5408\u7d22\u5f15\u662f\u6307\u5728\u591a\u500b\u5217\u4e0a\u5275\u5efa\u7684\u7d22\u5f15\u3002\u4f8b\u5982\uff0c\u5982\u679c\u7d93\u5e38\u6839\u64da\u7528\u6236\u540d\u548c\u96fb\u5b50\u90f5\u4ef6\u67e5\u8a62\uff0c\u53ef\u4ee5\u5275\u5efa\u5982\u4e0b\u8907\u5408\u7d22\u5f15\uff1a<\/p>\n<pre><code>CREATE INDEX idx_username_email ON users(username, email);<\/code><\/pre>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u8907\u5408\u7d22\u5f15\u7684\u5217\u9806\u5e8f\u6703\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\uff0c\u901a\u5e38\u5c07\u9078\u64c7\u6027\u9ad8\u7684\u5217\u653e\u5728\u524d\u9762\u3002<\/p>\n<h3 id=\"4-%e5%ae%9a%e6%9c%9f%e6%aa%a2%e6%9f%a5%e5%92%8c%e7%b6%ad%e8%ad%b7%e7%b4%a2%e5%bc%95-WbNiivCcTY\">4. \u5b9a\u671f\u6aa2\u67e5\u548c\u7dad\u8b77\u7d22\u5f15<\/h3>\n<p>\u96a8\u8457\u6578\u64da\u7684\u589e\u9577\u548c\u8b8a\u5316\uff0c\u7d22\u5f15\u7684\u6709\u6548\u6027\u53ef\u80fd\u6703\u4e0b\u964d\u3002\u56e0\u6b64\uff0c\u5b9a\u671f\u6aa2\u67e5\u7d22\u5f15\u7684\u4f7f\u7528\u60c5\u6cc1\u662f\u5fc5\u8981\u7684\u3002\u53ef\u4ee5\u4f7f\u7528 MySQL \u7684 <code>SHOW INDEX FROM table_name;<\/code> \u547d\u4ee4\u4f86\u67e5\u770b\u7d22\u5f15\u7684\u4f7f\u7528\u60c5\u6cc1\uff0c\u4e26\u6839\u64da\u9700\u8981\u9032\u884c\u8abf\u6574\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-WbNiivCcTY\">\u7d50\u8ad6<\/h2>\n<p>\u8a2d\u8a08\u6709\u6548\u7684 MySQL \u7d22\u5f15\u662f\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\u7684\u95dc\u9375\u3002\u901a\u904e\u5408\u7406\u9078\u64c7\u7d22\u5f15\u5217\u3001\u4f7f\u7528\u8907\u5408\u7d22\u5f15\u4ee5\u53ca\u5b9a\u671f\u7dad\u8b77\u7d22\u5f15\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002\u4e86\u89e3\u7d22\u5f15\u7684\u5de5\u4f5c\u539f\u7406\u548c\u6700\u4f73\u5be6\u8e10\uff0c\u5c07\u6709\u52a9\u65bc\u958b\u767c\u8005\u5728\u9762\u5c0d\u5927\u6578\u64da\u6642\uff0c\u80fd\u5920\u66f4\u597d\u5730\u7ba1\u7406\u548c\u512a\u5316\u6578\u64da\u5eab\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u904b\u884c\u60a8\u7684 MySQL \u6578\u64da\u5eab\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u5ba2\u6236\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u985e\u578b\u7684 <a href=\"https:\/\/server.hk\">\u670d\u52a1\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u8a2d\u8a08 MySQL \u7d22\u5f15\u4ee5\u63d0\u5347\u67e5\u8a62\u6548\u80fd\uff0c\u8b93\u4f60\u7684\u6578\u64da\u5eab\u6027\u80fd\u98db\u8e8d\uff0c\u5be6\u73fe\u66f4\u5feb\u7684\u6578\u64da\u6aa2\u7d22\u548c\u8655\u7406\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-195489","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/195489","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=195489"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/195489\/revisions"}],"predecessor-version":[{"id":195490,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/195489\/revisions\/195490"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=195489"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=195489"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=195489"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}