{"id":174741,"date":"2024-11-07T23:22:25","date_gmt":"2024-11-07T15:22:25","guid":{"rendered":"https:\/\/server.hk\/cnblog\/174741\/"},"modified":"2024-11-07T23:22:26","modified_gmt":"2024-11-07T15:22:26","slug":"%e5%a6%82%e4%bd%95%e7%90%86%e8%a7%a3%e4%b8%a6%e6%ad%a3%e7%a2%ba%e4%bd%bf%e7%94%a8mysql%e7%b4%a2%e5%bc%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/174741\/","title":{"rendered":"\u5982\u4f55\u7406\u89e3\u4e26\u6b63\u78ba\u4f7f\u7528MySQL\u7d22\u5f15"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e7%90%86%e8%a7%a3%e4%b8%a6%e6%ad%a3%e7%a2%ba%e4%bd%bf%e7%94%a8mysql%e7%b4%a2%e5%bc%95-nJBwWgiAeQ\">\u5982\u4f55\u7406\u89e3\u4e26\u6b63\u78ba\u4f7f\u7528MySQL\u7d22\u5f15<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u7d22\u5f15\u662f\u4e00\u7a2e\u91cd\u8981\u7684\u6578\u64da\u7d50\u69cb\uff0c\u80fd\u5920\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002MySQL\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u958b\u6e90\u6578\u64da\u5eab\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u7d22\u5f15\u985e\u578b\u548c\u4f7f\u7528\u65b9\u6cd5\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eMySQL\u7d22\u5f15\u7684\u57fa\u672c\u6982\u5ff5\u3001\u985e\u578b\u53ca\u5176\u6b63\u78ba\u4f7f\u7528\u65b9\u6cd5\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afmysql%e7%b4%a2%e5%bc%95%ef%bc%9f-nJBwWgiAeQ\">\u4ec0\u9ebc\u662fMySQL\u7d22\u5f15\uff1f<\/h2>\n<p>\u7d22\u5f15\u662f\u4e00\u7a2e\u6578\u64da\u7d50\u69cb\uff0c\u65e8\u5728\u52a0\u901f\u6578\u64da\u6aa2\u7d22\u7684\u901f\u5ea6\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\u3002\u7576\u67e5\u8a62\u4e00\u500b\u8868\u6642\uff0c\u6578\u64da\u5eab\u53ef\u4ee5\u5229\u7528\u7d22\u5f15\u4f86\u6e1b\u5c11\u9700\u8981\u6383\u63cf\u7684\u884c\u6578\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/p>\n<h2 id=\"mysql%e7%b4%a2%e5%bc%95%e7%9a%84%e9%a1%9e%e5%9e%8b-nJBwWgiAeQ\">MySQL\u7d22\u5f15\u7684\u985e\u578b<\/h2>\n<p>MySQL\u652f\u6301\u591a\u7a2e\u7d22\u5f15\u985e\u578b\uff0c\u6bcf\u7a2e\u7d22\u5f15\u90fd\u6709\u5176\u7279\u5b9a\u7684\u7528\u9014\u548c\u512a\u7f3a\u9ede\uff1a<\/p>\n<ul>\n<li><strong>\u4e3b\u9375\u7d22\u5f15\uff08Primary Key Index\uff09<\/strong>\uff1a\u6bcf\u500b\u8868\u53ea\u80fd\u6709\u4e00\u500b\u4e3b\u9375\u7d22\u5f15\uff0c\u4e26\u4e14\u4e3b\u9375\u7684\u503c\u5fc5\u9808\u552f\u4e00\u4e14\u4e0d\u80fd\u70baNULL\u3002\u4e3b\u9375\u7d22\u5f15\u81ea\u52d5\u5275\u5efa\u4e00\u500b\u552f\u4e00\u7684B-tree\u7d22\u5f15\u3002<\/li>\n<li><strong>\u552f\u4e00\u7d22\u5f15\uff08Unique Index\uff09<\/strong>\uff1a\u8207\u4e3b\u9375\u7d22\u5f15\u985e\u4f3c\uff0c\u4f46\u5141\u8a31NULL\u503c\u3002\u552f\u4e00\u7d22\u5f15\u78ba\u4fdd\u7d22\u5f15\u5217\u4e2d\u7684\u6240\u6709\u503c\u90fd\u662f\u552f\u4e00\u7684\u3002<\/li>\n<li><strong>\u666e\u901a\u7d22\u5f15\uff08Index\uff09<\/strong>\uff1a\u6700\u57fa\u672c\u7684\u7d22\u5f15\u985e\u578b\uff0c\u6c92\u6709\u552f\u4e00\u6027\u9650\u5236\u3002\u666e\u901a\u7d22\u5f15\u53ef\u4ee5\u52a0\u901f\u67e5\u8a62\uff0c\u4f46\u4e0d\u4fdd\u8b49\u503c\u7684\u552f\u4e00\u6027\u3002<\/li>\n<li><strong>\u5168\u6587\u7d22\u5f15\uff08Fulltext Index\uff09<\/strong>\uff1a\u5c08\u9580\u7528\u65bc\u52a0\u901f\u5c0d\u6587\u672c\u6578\u64da\u7684\u641c\u7d22\uff0c\u9069\u5408\u7528\u65bc\u5927\u6587\u672c\u5b57\u6bb5\u7684\u67e5\u8a62\u3002<\/li>\n<li><strong>\u8907\u5408\u7d22\u5f15\uff08Composite Index\uff09<\/strong>\uff1a\u7531\u591a\u500b\u5217\u7d44\u6210\u7684\u7d22\u5f15\uff0c\u53ef\u4ee5\u63d0\u9ad8\u591a\u5217\u67e5\u8a62\u7684\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%89%b5%e5%bb%ba%e5%92%8c%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95-nJBwWgiAeQ\">\u5982\u4f55\u5275\u5efa\u548c\u4f7f\u7528\u7d22\u5f15<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528CREATE INDEX\u8a9e\u53e5\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 (column1, column2, ...);<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5047\u8a2d\u6709\u4e00\u500b\u540d\u70ba\u201cusers\u201d\u7684\u8868\uff0c\u5305\u542b\u201cusername\u201d\u548c\u201cemail\u201d\u5169\u500b\u5217\uff0c\u60a8\u53ef\u4ee5\u9019\u6a23\u5275\u5efa\u4e00\u500b\u666e\u901a\u7d22\u5f15\uff1a<\/p>\n<pre><code>CREATE INDEX idx_username ON users (username);<\/code><\/pre>\n<p>\u5728\u67e5\u8a62\u6642\uff0cMySQL\u6703\u81ea\u52d5\u9078\u64c7\u4f7f\u7528\u7d22\u5f15\u4f86\u52a0\u901f\u67e5\u8a62\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE username = 'john_doe';<\/code><\/pre>\n<h2 id=\"%e7%b4%a2%e5%bc%95%e7%9a%84%e5%84%aa%e7%bc%ba%e9%bb%9e-nJBwWgiAeQ\">\u7d22\u5f15\u7684\u512a\u7f3a\u9ede<\/h2>\n<p>\u96d6\u7136\u7d22\u5f15\u80fd\u5920\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u4f46\u4e5f\u6709\u5176\u7f3a\u9ede\uff1a<\/p>\n<ul>\n<li><strong>\u512a\u9ede\uff1a<\/strong>\u7d22\u5f15\u80fd\u5920\u52a0\u901f\u67e5\u8a62\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\uff0c\u80fd\u5920\u986f\u8457\u6e1b\u5c11\u67e5\u8a62\u6642\u9593\u3002<\/li>\n<li><strong>\u7f3a\u9ede\uff1a<\/strong>\u7d22\u5f15\u6703\u4f54\u7528\u984d\u5916\u7684\u5b58\u5132\u7a7a\u9593\uff0c\u4e26\u4e14\u5728\u63d2\u5165\u3001\u66f4\u65b0\u6216\u522a\u9664\u6578\u64da\u6642\uff0c\u7d22\u5f15\u4e5f\u9700\u8981\u9032\u884c\u76f8\u61c9\u7684\u66f4\u65b0\uff0c\u9019\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-nJBwWgiAeQ\">\u6700\u4f73\u5be6\u8e10<\/h2>\n<p>\u5728\u4f7f\u7528MySQL\u7d22\u5f15\u6642\uff0c\u9075\u5faa\u4e00\u4e9b\u6700\u4f73\u5be6\u8e10\u53ef\u4ee5\u5e6b\u52a9\u60a8\u66f4\u6709\u6548\u5730\u7ba1\u7406\u7d22\u5f15\uff1a<\/p>\n<ul>\n<li>\u50c5\u5728\u9700\u8981\u7684\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u907f\u514d\u904e\u591a\u7684\u7d22\u5f15\u5f71\u97ff\u6027\u80fd\u3002<\/li>\n<li>\u5b9a\u671f\u6aa2\u67e5\u548c\u512a\u5316\u7d22\u5f15\uff0c\u522a\u9664\u4e0d\u518d\u4f7f\u7528\u7684\u7d22\u5f15\u3002<\/li>\n<li>\u4f7f\u7528EXPLAIN\u8a9e\u53e5\u4f86\u5206\u6790\u67e5\u8a62\u8a08\u5283\uff0c\u78ba\u4fdd\u7d22\u5f15\u88ab\u6b63\u78ba\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-nJBwWgiAeQ\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u7d22\u5f15\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6578\u64da\u6aa2\u7d22\u7684\u6548\u7387\u3002\u7406\u89e3\u4e0d\u540c\u985e\u578b\u7684\u7d22\u5f15\u53ca\u5176\u4f7f\u7528\u65b9\u6cd5\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u512a\u5316\u6578\u64da\u5eab\u6027\u80fd\u3002\u5728\u9078\u64c7\u548c\u7ba1\u7406\u7d22\u5f15\u6642\uff0c\u61c9\u8003\u616e\u5230\u5176\u512a\u7f3a\u9ede\uff0c\u4e26\u9075\u5faa\u6700\u4f73\u5be6\u8e10\uff0c\u4ee5\u78ba\u4fdd\u6578\u64da\u5eab\u7684\u9ad8\u6548\u904b\u884c\u3002\u5982\u679c\u60a8\u9700\u8981\u9032\u4e00\u6b65\u7684\u652f\u6301\u6216\u5c0b\u627e\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u7d22\u5f15\u7684\u539f\u7406\u8207\u6700\u4f73\u5be6\u8e10\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\uff0c\u512a\u5316\u6578\u64da\u5eab\u6027\u80fd\uff0c\u78ba\u4fdd\u6578\u64da\u64cd\u4f5c\u7684\u5feb\u901f\u8207\u6e96\u78ba\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-174741","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/174741","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=174741"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/174741\/revisions"}],"predecessor-version":[{"id":174742,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/174741\/revisions\/174742"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=174741"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=174741"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=174741"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}