{"id":76662,"date":"2024-10-16T08:46:16","date_gmt":"2024-10-16T00:46:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/76662\/"},"modified":"2024-10-16T08:46:16","modified_gmt":"2024-10-16T00:46:16","slug":"mysql%e6%95%b8%e6%93%9a%e5%ba%ab%e5%84%aa%e5%8c%96%e4%b8%ad%e8%a6%81%e7%94%a8%e5%88%b0%e5%93%aa%e4%ba%9b%e8%aa%9e%e5%8f%a5%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/76662\/","title":{"rendered":"MySQL\u6578\u64da\u5eab\u512a\u5316\u4e2d\u8981\u7528\u5230\u54ea\u4e9b\u8a9e\u53e5\uff1f"},"content":{"rendered":"<h1 id=\"mysql%e6%95%b8%e6%93%9a%e5%ba%ab%e5%84%aa%e5%8c%96%e4%b8%ad%e8%a6%81%e7%94%a8%e5%88%b0%e5%93%aa%e4%ba%9b%e8%aa%9e%e5%8f%a5%ef%bc%9f-dVBIDLBPxp\">MySQL\u6578\u64da\u5eab\u512a\u5316\u4e2d\u8981\u7528\u5230\u54ea\u4e9b\u8a9e\u53e5\uff1f<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u6027\u80fd\u5c0d\u65bc\u61c9\u7528\u7a0b\u5e8f\u7684\u6574\u9ad4\u6548\u7387\u81f3\u95dc\u91cd\u8981\u3002MySQL\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u958b\u6e90\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u512a\u5316\u6578\u64da\u5eab\u6027\u80fd\u7684\u8a9e\u53e5\u548c\u6280\u8853\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5728MySQL\u6578\u64da\u5eab\u512a\u5316\u904e\u7a0b\u4e2d\u5e38\u7528\u7684\u8a9e\u53e5\u53ca\u5176\u61c9\u7528\u3002<\/p>\n<h2 id=\"1-%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95-dVBIDLBPxp\">1. \u4f7f\u7528\u7d22\u5f15<\/h2>\n<p>\u7d22\u5f15\u662f\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u7684\u95dc\u9375\u3002\u901a\u904e\u5728\u8868\u7684\u67d0\u4e9b\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u986f\u8457\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\u3002\u4ee5\u4e0b\u662f\u5275\u5efa\u7d22\u5f15\u7684\u57fa\u672c\u8a9e\u53e5\uff1a<\/p>\n<pre><code>CREATE INDEX index_name ON table_name (column_name);<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u5728\u201cusers\u201d\u8868\u7684\u201cemail\u201d\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>CREATE INDEX idx_email ON users (email);<\/code><\/pre>\n<h3 id=\"1-1-%e6%9f%a5%e7%9c%8b%e7%b4%a2%e5%bc%95-dVBIDLBPxp\">1.1. \u67e5\u770b\u7d22\u5f15<\/h3>\n<p>\u8981\u67e5\u770b\u8868\u4e2d\u73fe\u6709\u7684\u7d22\u5f15\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SHOW INDEX FROM table_name;<\/code><\/pre>\n<h2 id=\"2-%e6%9f%a5%e8%a9%a2%e5%84%aa%e5%8c%96-dVBIDLBPxp\">2. \u67e5\u8a62\u512a\u5316<\/h2>\n<p>\u5728\u9032\u884c\u67e5\u8a62\u6642\uff0c\u4f7f\u7528\u9069\u7576\u7684\u8a9e\u53e5\u53ef\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684\u67e5\u8a62\u512a\u5316\u6280\u5de7\uff1a<\/p>\n<ul>\n<li><strong>\u907f\u514d\u4f7f\u7528SELECT *\uff1a<\/strong>\u9078\u64c7\u7279\u5b9a\u7684\u5217\u53ef\u4ee5\u6e1b\u5c11\u6578\u64da\u50b3\u8f38\u91cf\u3002<\/li>\n<li><strong>\u4f7f\u7528LIMIT\uff1a<\/strong>\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528LIMIT\u53ef\u4ee5\u9650\u5236\u8fd4\u56de\u7684\u884c\u6578\uff0c\u5f9e\u800c\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT name, email FROM users WHERE age &gt; 30 LIMIT 10;<\/code><\/pre>\n<h2 id=\"3-%e4%bd%bf%e7%94%a8explain%e5%88%86%e6%9e%90%e6%9f%a5%e8%a9%a2-dVBIDLBPxp\">3. \u4f7f\u7528EXPLAIN\u5206\u6790\u67e5\u8a62<\/h2>\n<p>\u4f7f\u7528EXPLAIN\u8a9e\u53e5\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u4e86\u89e3\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\uff0c\u5f9e\u800c\u627e\u51fa\u6f5b\u5728\u7684\u6027\u80fd\u74f6\u9838\u3002\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>EXPLAIN SELECT * FROM table_name WHERE condition;<\/code><\/pre>\n<p>\u9019\u5c07\u986f\u793aMySQL\u5982\u4f55\u57f7\u884c\u8a72\u67e5\u8a62\uff0c\u5305\u62ec\u4f7f\u7528\u7684\u7d22\u5f15\u548c\u884c\u6578\u7b49\u4fe1\u606f\u3002<\/p>\n<h2 id=\"4-%e5%84%aa%e5%8c%96%e8%a1%a8%e7%b5%90%e6%a7%8b-dVBIDLBPxp\">4. \u512a\u5316\u8868\u7d50\u69cb<\/h2>\n<p>\u8868\u7684\u7d50\u69cb\u8a2d\u8a08\u5c0d\u6027\u80fd\u6709\u8457\u91cd\u8981\u5f71\u97ff\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u512a\u5316\u8868\u7d50\u69cb\u7684\u5efa\u8b70\uff1a<\/p>\n<ul>\n<li><strong>\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\uff1a<\/strong>\u4f7f\u7528\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u53ef\u4ee5\u6e1b\u5c11\u5b58\u5132\u7a7a\u9593\u548c\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<li><strong>\u6b63\u898f\u5316\u8207\u53cd\u6b63\u898f\u5316\uff1a<\/strong>\u6839\u64da\u9700\u6c42\u9078\u64c7\u6b63\u898f\u5316\u6216\u53cd\u6b63\u898f\u5316\uff0c\u4ee5\u5e73\u8861\u6578\u64da\u5197\u9918\u548c\u67e5\u8a62\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"5-%e4%bd%bf%e7%94%a8%e7%b7%a9%e5%ad%98-dVBIDLBPxp\">5. \u4f7f\u7528\u7de9\u5b58<\/h2>\n<p>MySQL\u63d0\u4f9b\u4e86\u591a\u7a2e\u7de9\u5b58\u6a5f\u5236\uff0c\u5982\u67e5\u8a62\u7de9\u5b58\u548cInnoDB\u7de9\u5b58\u3002\u901a\u904e\u5408\u7406\u914d\u7f6e\u7de9\u5b58\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u4ee5\u4e0b\u662f\u67e5\u770b\u67e5\u8a62\u7de9\u5b58\u72c0\u614b\u7684\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SHOW STATUS LIKE 'Qcache%';<\/code><\/pre>\n<h2 id=\"6-%e5%ae%9a%e6%9c%9f%e7%b6%ad%e8%ad%b7%e6%95%b8%e6%93%9a%e5%ba%ab-dVBIDLBPxp\">6. \u5b9a\u671f\u7dad\u8b77\u6578\u64da\u5eab<\/h2>\n<p>\u5b9a\u671f\u9032\u884c\u6578\u64da\u5eab\u7dad\u8b77\uff0c\u5982\u512a\u5316\u8868\u548c\u6e05\u7406\u4e0d\u5fc5\u8981\u7684\u6578\u64da\uff0c\u53ef\u4ee5\u4fdd\u6301\u6578\u64da\u5eab\u7684\u9ad8\u6548\u904b\u884c\u3002\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\u53ef\u4ee5\u512a\u5316\u8868\uff1a<\/p>\n<pre><code>OPTIMIZE TABLE table_name;<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-dVBIDLBPxp\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u6578\u64da\u5eab\u7684\u512a\u5316\u662f\u4e00\u500b\u6301\u7e8c\u7684\u904e\u7a0b\uff0c\u6d89\u53ca\u591a\u7a2e\u8a9e\u53e5\u548c\u6280\u8853\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528\u7d22\u5f15\u3001\u512a\u5316\u67e5\u8a62\u3001\u5206\u6790\u57f7\u884c\u8a08\u5283\u3001\u512a\u5316\u8868\u7d50\u69cb\u3001\u4f7f\u7528\u7de9\u5b58\u4ee5\u53ca\u5b9a\u671f\u7dad\u8b77\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6027\u80fd\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u4e86\u89e3\u66f4\u591a\u95dc\u65bc <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u548c <a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a> \u7684\u4fe1\u606f\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22MySQL\u6578\u64da\u5eab\u512a\u5316\u7684\u95dc\u9375\u8a9e\u53e5\uff0c\u63d0\u5347\u6027\u80fd\u8207\u6548\u7387\uff0c\u78ba\u4fdd\u6578\u64da\u8655\u7406\u66f4\u5feb\u901f\u3001\u7a69\u5b9a\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-76662","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76662","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=76662"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76662\/revisions"}],"predecessor-version":[{"id":76663,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76662\/revisions\/76663"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=76662"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=76662"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=76662"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}