{"id":77624,"date":"2024-10-16T10:56:20","date_gmt":"2024-10-16T02:56:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/77624\/"},"modified":"2024-10-16T10:56:21","modified_gmt":"2024-10-16T02:56:21","slug":"mysql%e5%9c%a8%e5%a4%a7%e6%95%b8%e6%93%9a%e3%80%81%e9%ab%98%e4%b8%a6%e7%99%bc%e5%a0%b4%e6%99%af%e4%b8%8b%e7%9a%84sql%e8%aa%9e%e5%8f%a5%e5%84%aa%e5%8c%96%e5%92%8c%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/77624\/","title":{"rendered":"MySQL\u5728\u5927\u6578\u64da\u3001\u9ad8\u4e26\u767c\u5834\u666f\u4e0b\u7684SQL\u8a9e\u53e5\u512a\u5316\u548c&#8221;\u6700\u4f73\u5be6\u8e10&#8221;"},"content":{"rendered":"<h1 id=\"mysql%e5%9c%a8%e5%a4%a7%e6%95%b8%e6%93%9a%e3%80%81%e9%ab%98%e4%b8%a6%e7%99%bc%e5%a0%b4%e6%99%af%e4%b8%8b%e7%9a%84sql%e8%aa%9e%e5%8f%a5%e5%84%aa%e5%8c%96%e5%92%8c%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-UUePmxqaEf\">MySQL\u5728\u5927\u6578\u64da\u3001\u9ad8\u4e26\u767c\u5834\u666f\u4e0b\u7684SQL\u8a9e\u53e5\u512a\u5316\u548c\u6700\u4f73\u5be6\u8e10<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0cMySQL\u4f5c\u70ba\u4e00\u7a2e\u6d41\u884c\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u696d\u52d9\u5834\u666f\u3002\u96a8\u8457\u5927\u6578\u64da\u548c\u9ad8\u4e26\u767c\u9700\u6c42\u7684\u589e\u52a0\uff0c\u5982\u4f55\u512a\u5316MySQL\u7684SQL\u8a9e\u53e5\u6210\u70ba\u4e86\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u9762\u81e8\u7684\u91cd\u8981\u6311\u6230\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5728\u9019\u4e9b\u5834\u666f\u4e0b\u7684SQL\u8a9e\u53e5\u512a\u5316\u6280\u5de7\u548c\u6700\u4f73\u5be6\u8e10\u3002<\/p>\n<h2 id=\"%e7%90%86%e8%a7%a3sql%e8%aa%9e%e5%8f%a5%e7%9a%84%e5%9f%b7%e8%a1%8c%e8%a8%88%e5%8a%83-UUePmxqaEf\">\u7406\u89e3SQL\u8a9e\u53e5\u7684\u57f7\u884c\u8a08\u5283<\/h2>\n<p>\u5728\u9032\u884cSQL\u512a\u5316\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u4e86\u89e3SQL\u8a9e\u53e5\u7684\u57f7\u884c\u8a08\u5283\u3002\u57f7\u884c\u8a08\u5283\u662f\u6578\u64da\u5eab\u7cfb\u7d71\u7528\u4f86\u57f7\u884cSQL\u67e5\u8a62\u7684\u6b65\u9a5f\u3002\u4f7f\u7528MySQL\u7684EXPLAIN\u547d\u4ee4\u53ef\u4ee5\u67e5\u770b\u57f7\u884c\u8a08\u5283\uff0c\u5e6b\u52a9\u6211\u5011\u8b58\u5225\u6f5b\u5728\u7684\u6027\u80fd\u74f6\u9838\u3002<\/p>\n<pre><code>EXPLAIN SELECT * FROM users WHERE age &gt; 30;<\/code><\/pre>\n<p>\u901a\u904e\u5206\u6790\u57f7\u884c\u8a08\u5283\uff0c\u6211\u5011\u53ef\u4ee5\u4e86\u89e3\u67e5\u8a62\u7684\u57f7\u884c\u65b9\u5f0f\uff0c\u5305\u62ec\u4f7f\u7528\u7684\u7d22\u5f15\u3001\u884c\u6578\u4f30\u7b97\u7b49\u4fe1\u606f\uff0c\u5f9e\u800c\u9032\u884c\u91dd\u5c0d\u6027\u7684\u512a\u5316\u3002<\/p>\n<h2 id=\"%e7%b4%a2%e5%bc%95%e7%9a%84%e4%bd%bf%e7%94%a8-UUePmxqaEf\">\u7d22\u5f15\u7684\u4f7f\u7528<\/h2>\n<p>\u7d22\u5f15\u662f\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u7684\u95dc\u9375\u3002\u9069\u7576\u7684\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u6e1b\u5c11\u67e5\u8a62\u7684\u57f7\u884c\u6642\u9593\u3002\u5728\u9ad8\u4e26\u767c\u5834\u666f\u4e0b\uff0c\u9078\u64c7\u5408\u9069\u7684\u7d22\u5f15\u985e\u578b\uff08\u5982B-tree\u7d22\u5f15\u3001\u54c8\u5e0c\u7d22\u5f15\u7b49\uff09\u5c24\u70ba\u91cd\u8981\u3002<\/p>\n<ul>\n<li><strong>\u9078\u64c7\u6027\u9ad8\u7684\u5217\uff1a<\/strong>\u5c0d\u65bc\u9078\u64c7\u6027\u9ad8\u7684\u5217\uff08\u5373\u4e0d\u540c\u503c\u7684\u6578\u91cf\u76f8\u5c0d\u65bc\u7e3d\u884c\u6578\u7684\u6bd4\u4f8b\u9ad8\uff09\uff0c\u61c9\u8003\u616e\u5efa\u7acb\u7d22\u5f15\u3002<\/li>\n<li><strong>\u8907\u5408\u7d22\u5f15\uff1a<\/strong>\u5c0d\u65bc\u7d93\u5e38\u4e00\u8d77\u67e5\u8a62\u7684\u591a\u500b\u5217\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528\u8907\u5408\u7d22\u5f15\u3002<\/li>\n<li><strong>\u907f\u514d\u904e\u591a\u7d22\u5f15\uff1a<\/strong>\u96d6\u7136\u7d22\u5f15\u53ef\u4ee5\u52a0\u901f\u67e5\u8a62\uff0c\u4f46\u904e\u591a\u7684\u7d22\u5f15\u6703\u5f71\u97ff\u5beb\u5165\u6027\u80fd\uff0c\u56e0\u6b64\u9700\u8981\u5e73\u8861\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e8%aa%9e%e5%8f%a5%e7%9a%84%e5%84%aa%e5%8c%96-UUePmxqaEf\">\u67e5\u8a62\u8a9e\u53e5\u7684\u512a\u5316<\/h2>\n<p>\u5728\u9ad8\u4e26\u767c\u5834\u666f\u4e0b\uff0c\u512a\u5316\u67e5\u8a62\u8a9e\u53e5\u672c\u8eab\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u512a\u5316\u6280\u5de7\uff1a<\/p>\n<ul>\n<li><strong>\u9078\u64c7\u5fc5\u8981\u7684\u5217\uff1a<\/strong>\u907f\u514d\u4f7f\u7528SELECT *\uff0c\u53ea\u9078\u64c7\u9700\u8981\u7684\u5217\uff0c\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u6578\u64da\u50b3\u8f38\u91cf\u3002<\/li>\n<li><strong>\u4f7f\u7528JOIN\u800c\u975e\u5b50\u67e5\u8a62\uff1a<\/strong>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528JOIN\u53ef\u4ee5\u6bd4\u5b50\u67e5\u8a62\u66f4\u9ad8\u6548\u3002<\/li>\n<li><strong>\u907f\u514d\u4f7f\u7528\u51fd\u6578\u5728WHERE\u5b50\u53e5\u4e2d\uff1a<\/strong>\u5728WHERE\u5b50\u53e5\u4e2d\u4f7f\u7528\u51fd\u6578\u6703\u5c0e\u81f4\u7d22\u5f15\u5931\u6548\uff0c\u61c9\u76e1\u91cf\u907f\u514d\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e9%85%8d%e7%bd%ae%e7%9a%84%e8%aa%bf%e6%95%b4-UUePmxqaEf\">\u6578\u64da\u5eab\u914d\u7f6e\u7684\u8abf\u6574<\/h2>\n<p>\u9664\u4e86SQL\u8a9e\u53e5\u7684\u512a\u5316\uff0c\u6578\u64da\u5eab\u7684\u914d\u7f6e\u4e5f\u6703\u5f71\u97ff\u6027\u80fd\u3002\u5728\u9ad8\u4e26\u767c\u5834\u666f\u4e0b\uff0c\u9069\u7576\u8abf\u6574MySQL\u7684\u914d\u7f6e\u53c3\u6578\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6027\u80fd\u3002\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li><strong>innodb_buffer_pool_size\uff1a<\/strong>\u9019\u500b\u53c3\u6578\u6c7a\u5b9a\u4e86InnoDB\u5b58\u5132\u5f15\u64ce\u7528\u65bc\u7de9\u5b58\u6578\u64da\u548c\u7d22\u5f15\u7684\u5167\u5b58\u5927\u5c0f\uff0c\u61c9\u6839\u64da\u53ef\u7528\u5167\u5b58\u9032\u884c\u8abf\u6574\u3002<\/li>\n<li><strong>max_connections\uff1a<\/strong>\u9019\u500b\u53c3\u6578\u6c7a\u5b9a\u4e86\u540c\u6642\u9023\u63a5\u5230\u6578\u64da\u5eab\u7684\u6700\u5927\u5ba2\u6236\u7aef\u6578\u91cf\uff0c\u61c9\u6839\u64da\u5be6\u969b\u9700\u6c42\u9032\u884c\u8a2d\u7f6e\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%9b%a3%e6%8e%a7%e5%92%8c%e8%aa%bf%e8%a9%a6-UUePmxqaEf\">\u76e3\u63a7\u548c\u8abf\u8a66<\/h2>\n<p>\u6301\u7e8c\u76e3\u63a7\u6578\u64da\u5eab\u6027\u80fd\u662f\u78ba\u4fdd\u9ad8\u6548\u904b\u884c\u7684\u95dc\u9375\u3002\u4f7f\u7528MySQL\u7684\u6162\u67e5\u8a62\u65e5\u8a8c\u529f\u80fd\uff0c\u53ef\u4ee5\u8a18\u9304\u57f7\u884c\u6642\u9593\u8d85\u904e\u6307\u5b9a\u6642\u9593\u7684\u67e5\u8a62\uff0c\u5e6b\u52a9\u8b58\u5225\u6027\u80fd\u74f6\u9838\u3002<\/p>\n<pre><code>SET GLOBAL slow_query_log = 'ON';<\/code><\/pre>\n<p>\u901a\u904e\u5206\u6790\u6162\u67e5\u8a62\u65e5\u8a8c\uff0c\u53ef\u4ee5\u91dd\u5c0d\u6027\u5730\u512a\u5316\u6027\u80fd\u8f03\u5dee\u7684\u67e5\u8a62\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-UUePmxqaEf\">\u7e3d\u7d50<\/h2>\n<p>\u5728\u5927\u6578\u64da\u548c\u9ad8\u4e26\u767c\u5834\u666f\u4e0b\uff0cMySQL\u7684SQL\u8a9e\u53e5\u512a\u5316\u662f\u4e00\u500b\u591a\u65b9\u9762\u7684\u904e\u7a0b\uff0c\u6d89\u53ca\u57f7\u884c\u8a08\u5283\u5206\u6790\u3001\u7d22\u5f15\u4f7f\u7528\u3001\u67e5\u8a62\u8a9e\u53e5\u512a\u5316\u3001\u6578\u64da\u5eab\u914d\u7f6e\u8abf\u6574\u4ee5\u53ca\u6301\u7e8c\u76e3\u63a7\u3002\u901a\u904e\u9075\u5faa\u9019\u4e9b\u6700\u4f73\u5be6\u8e10\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8MySQL\u7684\u6027\u80fd\uff0c\u6eff\u8db3\u696d\u52d9\u9700\u6c42\u3002\u82e5\u60a8\u9700\u8981\u9032\u4e00\u6b65\u4e86\u89e3\u5982\u4f55\u5728\u9999\u6e2f\u7684\u74b0\u5883\u4e2d\u512a\u5316\u60a8\u7684\u6578\u64da\u5eab\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u670d\u52d9\uff0c\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22MySQL\u5728\u5927\u6578\u64da\u548c\u9ad8\u4e26\u767c\u74b0\u5883\u4e2d\u7684SQL\u8a9e\u53e5\u512a\u5316\u6280\u5de7\u8207\u6700\u4f73\u5be6\u8e10\uff0c\u63d0\u5347\u6027\u80fd\u8207\u6548\u7387\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-77624","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/77624","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=77624"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/77624\/revisions"}],"predecessor-version":[{"id":77625,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/77624\/revisions\/77625"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=77624"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=77624"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=77624"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}