{"id":30673,"date":"2026-05-01T10:00:00","date_gmt":"2026-05-01T02:00:00","guid":{"rendered":"https:\/\/cn.hostease.com\/blog\/?p=30673"},"modified":"2026-05-16T23:27:29","modified_gmt":"2026-05-16T15:27:29","slug":"mysql-slow-query-index-optimization","status":"publish","type":"post","link":"https:\/\/cn.hostease.com\/blog\/server\/mysql-slow-query-index-optimization\/","title":{"rendered":"MySQL \u6162\u67e5\u8be2\u65e5\u5fd7\u5206\u6790\u4e0e\u7d22\u5f15\u4f18\u5316\u5b9e\u6218\u6307\u5357"},"content":{"rendered":"<p><img decoding=\"async\" alt=\"MySQL \u6162\u67e5\u8be2\u65e5\u5fd7\u5206\u6790\u4e0e\u7d22\u5f15\u4f18\u5316\u5168\u666f\" src=\"https:\/\/cn.hostease.com\/blog\/wp-content\/uploads\/2026\/05\/mysql-optimization-practical-cover.webp\" \/><\/p>\n<p>\u672c\u6587\u6559\u4f60\u5982\u4f55\u5728\u4e24\u5c0f\u65f6\u5185\u628a MySQL 8.0 \u4e0a\u4e00\u7ec4\u79d2\u7ea7\u6162\u67e5\u8be2\uff0c\u901a\u8fc7\u6162\u67e5\u8be2\u65e5\u5fd7\u3001EXPLAIN\uff08MySQL \u7684\u6267\u884c\u8ba1\u5212\u67e5\u770b\u5de5\u5177\uff0c\u7528\u6765\u5c55\u793a\u4e00\u6761\u67e5\u8be2\u5982\u4f55\u9009\u62e9\u7d22\u5f15\u4e0e\u8fde\u63a5\u65b9\u5f0f\uff09\u3001\u590d\u5408\u7d22\u5f15\u4e09\u4ef6\u5957\u538b\u5230\u6beb\u79d2\u7ea7\uff0c\u7ed9\u51fa\u4e00\u4efd\u53ef\u5728\u751f\u4ea7\u73af\u5883\u76f4\u63a5\u590d\u7528\u7684\u8bca\u65ad\u4e0e\u4f18\u5316\u6d41\u7a0b\u3002\u8bfb\u5b8c\u672c\u6587\u4f60\u4f1a\u5f97\u5230\u4e09\u4ef6\u53ef\u76f4\u63a5\u843d\u5730\u7684\u4ea7\u51fa\uff1a\u7b2c\u4e00\uff0c\u6162\u67e5\u8be2\u65e5\u5fd7\u7684\u5f00\u542f\u53c2\u6570\u8868\u4e0e\u6309\u884c\u89e3\u8bfb\u6a21\u677f\uff0c\u907f\u514d\u65e5\u5fd7\u5199\u7206\u78c1\u76d8\uff1b\u7b2c\u4e8c\uff0cpt-query-digest \u62a5\u544a\u5b57\u6bb5\u7684\u5b9e\u6218\u89e3\u8bfb\u601d\u8def\uff0c\u5b9a\u4f4d top 5 \u9ad8\u8017\u65f6\u6a21\u5f0f\uff1b\u7b2c\u4e09\uff0c\u4e00\u7ec4\u8986\u76d6\u8303\u56f4\u67e5\u8be2\u3001\u6392\u5e8f\u3001\u5206\u7ec4\u3001\u8986\u76d6\u7d22\u5f15\u7684\u5b9e\u6218\u8c03\u4f18\u6848\u4f8b\uff0c\u8ba9\u56e2\u961f\u5efa\u7acb\u53ef\u590d\u5236\u7684\u7d22\u5f15\u8bbe\u8ba1\u76f4\u89c9\uff0c\u544a\u522b&#8221;\u62cd\u8111\u888b\u52a0\u7d22\u5f15&#8221;\u3002<\/p>\n<h2>\u4e00\u3001\u4e3a\u4ec0\u4e48\u5148\u770b\u6162\u67e5\u8be2\u65e5\u5fd7\u518d\u52a8\u624b\u4f18\u5316<\/h2>\n<p>\u5982\u4f55\u5728\u4e0d\u6253\u6270\u4e1a\u52a1\u9ad8\u5cf0\u3001\u4e0d\u5168\u8868\u626b\u63cf\u7684\u524d\u63d0\u4e0b\uff0c\u51c6\u786e\u627e\u5230\u62d6\u6162\u7cfb\u7edf\u7684\u90a3\u5341\u51e0\u6761 SQL\uff0c\u662f\u6027\u80fd\u8c03\u4f18\u7684\u7b2c\u4e00\u9053\u5173\u3002\u76f2\u76ee\u52a0\u7d22\u5f15\u4f1a\u5e26\u6765\u4e09\u4e2a\u53cd\u4f5c\u7528\uff1a\u5199\u5165\u653e\u5927\u3001\u7a7a\u95f4\u81a8\u80c0\u3001\u4f18\u5316\u5668\u8bef\u5224\u3002\u89e3\u51b3\u95ee\u9898\u7684\u6b63\u786e\u987a\u5e8f\u5e94\u8be5\u662f\u5148\u91c7\u96c6\u8bc1\u636e\u518d\u4e0b\u7ed3\u8bba\uff0c\u6162\u67e5\u8be2\u65e5\u5fd7\u5c31\u662f\u6700\u76f4\u63a5\u7684\u8bc1\u636e\u6765\u6e90\u3002MySQL \u6162\u67e5\u8be2\u65e5\u5fd7\u4f1a\u8bb0\u5f55\u6240\u6709\u6267\u884c\u65f6\u95f4\u8d85\u8fc7 long_query_time \u9608\u503c\u7684\u8bed\u53e5\uff0c\u914d\u5408 log_queries_not_using_indexes \u53c2\u6570\u8fd8\u80fd\u628a\u6ca1\u8d70\u7d22\u5f15\u7684\u5168\u8868\u626b\u63cf\u4e00\u5e76\u635e\u51fa\u3002<\/p>\n<p>\u628a\u8fd9\u4ef6\u4e8b\u505a\u624e\u5b9e\u9700\u8981\u4e24\u4e2a\u524d\u63d0\uff1a\u4e00\u662f\u6570\u636e\u5e93\u5b9e\u4f8b\u6240\u5728\u7684\u670d\u52a1\u5668\u78c1\u76d8 I\/O \u80fd\u8ddf\u4e0a\u65e5\u5fd7\u5199\u5165\uff0c\u4e8c\u662f\u6709\u8db3\u591f\u7684\u76d8\u5bb9\u91cf\u8ba9\u65e5\u5fd7\u81f3\u5c11\u4fdd\u7559 24 \u5c0f\u65f6\u3002\u5982\u679c\u4f60\u6b63\u5728\u4e3a\u65b0\u4e1a\u52a1\u6311\u9009\u6570\u636e\u5e93\u4e3b\u673a\uff0c\u53ef\u4ee5\u5148\u8bc4\u4f30\u5e95\u5c42\u8d44\u6e90\uff0c\u53c2\u8003<a href=\"https:\/\/cn.hostease.com\/blog\/guides\/cloud-server-buying-guide\/\">\u4e91\u670d\u52a1\u5668\u9009\u8d2d\u6307\u5357<\/a>\u91cc\u7684 IOPS \u4e0e\u78c1\u76d8\u8bfb\u5199\u90e8\u5206\u3002\u4e91\u670d\u52a1\u5668\uff08\u5373\u901a\u8fc7\u865a\u62df\u5316\u6280\u672f\u4ece<a href=\"https:\/\/cn.hostease.com\/dedicated-server\/\">\u7269\u7406\u670d\u52a1\u5668<\/a>\u96c6\u7fa4\u4e2d\u5207\u5206\u51fa\u6765\u7684\u5f39\u6027\u8ba1\u7b97\u8d44\u6e90\uff09\u5728\u505a OLTP \u573a\u666f\u65f6\u5bf9\u968f\u673a I\/O \u7684\u4f9d\u8d56\u5f88\u9ad8\uff0cSATA SSD \u4e0e NVMe SSD \u4e4b\u95f4\u7684\u5dee\u8ddd\u4f1a\u5728\u538b\u6d4b\u9636\u6bb5\u88ab\u653e\u5927\u6570\u5341\u500d\uff0c\u5f71\u54cd\u6574\u4f53\u4f18\u5316\u7a7a\u95f4\u3002<\/p>\n<h2>\u4e8c\u3001\u5f00\u542f\u6162\u67e5\u8be2\u65e5\u5fd7\u5e76\u91c7\u96c6\u7b2c\u4e00\u4efd\u62a5\u544a<\/h2>\n<p>\u5728 my.cnf \u7684 mysqld \u6bb5\u52a0\u5165\u4e0b\u9762\u8fd9\u4e9b\u53c2\u6570\u540e\uff0c\u91cd\u542f\u6216 reload \u5373\u53ef\u5f00\u59cb\u91c7\u96c6\u3002\u6838\u5fc3\u914d\u7f6e\u8981\u70b9\uff1a<\/p>\n<ul>\n<li>slow_query_log = 1\uff1a\u603b\u5f00\u5173<\/li>\n<li>slow_query_log_file = \/var\/log\/mysql\/slow.log\uff1a\u65e5\u5fd7\u8def\u5f84<\/li>\n<li>long_query_time = 1\uff1a\u9608\u503c 1 \u79d2\uff0c\u5199\u591a\u4e1a\u52a1\u5efa\u8bae\u5148\u7528 1 \u79d2\u518d\u8c03\u5230 0.5 \u79d2<\/li>\n<li>log_queries_not_using_indexes = 1\uff1a\u8bb0\u5f55\u672a\u8d70\u7d22\u5f15\u7684\u67e5\u8be2<\/li>\n<li>log_slow_admin_statements = 1\uff1a\u628a ALTER \u4e0e ANALYZE \u4e5f\u7eb3\u5165<\/li>\n<li>log_slow_extra = 1\uff1aMySQL 8.0 \u65b0\u589e\u7684\u989d\u5916\u8017\u65f6\u7ef4\u5ea6<\/li>\n<\/ul>\n<p>\u91c7\u96c6 4 \u5230 24 \u5c0f\u65f6\u540e\uff0c\u7528 mysqldumpslow -s t -t 20 slow.log \u62ff\u5230\u6309\u8017\u65f6\u6392\u5e8f\u7684\u524d 20 \u6761\uff1b\u8fdb\u4e00\u6b65\u7528 pt-query-digest slow.log \u751f\u6210\u8be6\u7ec6\u62a5\u544a\uff0c\u770b Response time\u3001Calls\u3001R\/Call\u3001Rows examined \u56db\u4e2a\u6838\u5fc3\u5217\u3002\u5982\u679c\u6570\u636e\u5e93\u90e8\u7f72\u5728 <a href=\"https:\/\/cn.hostease.com\/vps\/\">VPS<\/a>\uff08Virtual Private Server\uff0c<a href=\"https:\/\/cn.hostease.com\/vps\/\">\u865a\u62df\u4e13\u7528\u670d\u52a1\u5668<\/a>\uff0c\u901a\u8fc7\u865a\u62df\u5316\u5212\u5206\u7684\u72ec\u7acb\u5b9e\u4f8b\uff09\u4e0a\uff0c\u5efa\u8bae\u628a\u65e5\u5fd7\u5207\u7247\u5f52\u6863\u5230\u5bf9\u8c61\u5b58\u50a8\uff0c\u907f\u514d\u672c\u5730\u76d8\u5360\u6ee1\u3002\u9700\u8981\u8fdc\u7a0b\u62c9\u53d6\u65e5\u5fd7\u7684\u6d41\u7a0b\u53ef\u4ee5\u53c2\u8003<a href=\"https:\/\/cn.hostease.com\/blog\/tutorials\/us-vps-deployment-tutorial-guide\/\">\u7f8e\u56fd VPS \u90e8\u7f72\u6559\u7a0b<\/a>\u91cc\u7684 SSH \u4e0e\u6587\u4ef6\u540c\u6b65\u90e8\u5206\u3002\u4e3b\u6d41\u4e91\u5382\u5546\u7684 VPS \u5b9e\u4f8b\uff08\u5728\u78c1\u76d8\u6027\u80fd\u4e0e\u5e26\u5bbd\uff0c\u4e5f\u5c31\u662f\u7f51\u7edc\u51fa\u53e3\u7684\u6570\u636e\u4f20\u8f93\u901f\u7387\uff0c\u5355\u4f4d Mbps \u4e0a\uff09\u90fd\u80fd\u7a33\u5b9a\u627f\u8f7d\u8fd9\u7c7b\u65e5\u5fd7\u91c7\u96c6\u538b\u529b\u3002<\/p>\n<h2>\u4e09\u3001\u7528 EXPLAIN \u62c6\u89e3\u6267\u884c\u8ba1\u5212\u4e0e\u7d22\u5f15\u8bbe\u8ba1<\/h2>\n<p>\u62ff\u5230 top N \u6162 SQL \u540e\uff0c\u4e0b\u4e00\u6b65\u7528 EXPLAIN \u770b\u6267\u884c\u8ba1\u5212\u3002\u91cd\u70b9\u5173\u6ce8\u516d\u4e2a\u5b57\u6bb5\uff1a<\/p>\n<ul>\n<li>type\uff1aconst\u3001ref\u3001range\u3001index\u3001ALL \u7531\u4f18\u5230\u52a3\uff0c\u770b\u5230 ALL \u51e0\u4e4e\u4e00\u5b9a\u6709\u95ee\u9898<\/li>\n<li>key\uff1a\u5b9e\u9645\u4f7f\u7528\u7684\u7d22\u5f15\uff0cNULL \u8868\u793a\u6ca1\u8d70\u4efb\u4f55\u7d22\u5f15<\/li>\n<li>rows\uff1a\u4f30\u7b97\u626b\u63cf\u7684\u884c\u6570\uff0c\u8d8a\u63a5\u8fd1\u6700\u7ec8\u8fd4\u56de\u884c\u6570\u8d8a\u597d<\/li>\n<li>Extra\uff1aUsing index \u662f\u8986\u76d6\u7d22\u5f15\u6700\u4f73\uff0cUsing filesort \u4e0e Using temporary \u90fd\u8981\u8b66\u60d5<\/li>\n<li>key_len\uff1a\u590d\u5408\u7d22\u5f15\u5b9e\u9645\u4f7f\u7528\u4e86\u51e0\u4e2a\u5b57\u6bb5<\/li>\n<li>ref\uff1a\u8fde\u63a5\u6761\u4ef6\u4f7f\u7528\u7684\u5217\u6216\u5e38\u91cf<\/li>\n<\/ul>\n<p>\u9488\u5bf9 WHERE a = ? AND b &gt; ? ORDER BY c \u8fd9\u7c7b\u7ec4\u5408\uff0c\u590d\u5408\u7d22\u5f15\u7684\u5b57\u6bb5\u987a\u5e8f\u5e94\u8be5\u6309\u7b49\u503c\u5728\u524d\u3001\u8303\u56f4\u5728\u4e2d\u3001\u6392\u5e8f\u5728\u540e\u7684\u539f\u5219\u8bbe\u8ba1\u3002\u5982\u679c\u6392\u5e8f\u5b57\u6bb5\u548c\u8303\u56f4\u5b57\u6bb5\u51b2\u7a81\uff0c\u5f80\u5f80\u8981\u5728\u4e24\u4e2a\u6267\u884c\u8ba1\u5212\u91cc\u505a\u53d6\u820d\u3002\u8986\u76d6\u7d22\u5f15\uff08\u5373\u67e5\u8be2\u6240\u9700\u5b57\u6bb5\u5168\u90e8\u5305\u542b\u5728\u7d22\u5f15\u5185\uff0c\u65e0\u9700\u56de\u8868\uff09\u662f\u4f18\u5316\u9ad8\u9891\u67e5\u8be2\u7684\u6740\u624b\u950f\uff0c\u80fd\u628a\u56de\u8868\uff08\u6bcf\u547d\u4e2d\u4e00\u884c\u7d22\u5f15\u5c31\u8981\u53bb\u4e3b\u952e\u8868\u53d6\u6570\u636e\u7684\u8fc7\u7a0b\uff09\u4ece\u4e8c\u6b21 I\/O \u538b\u7f29\u5230\u96f6\u6b21\u3002<\/p>\n<h2>\u56db\u3001\u56db\u7c7b\u5178\u578b\u573a\u666f\u7684\u4f18\u5316\u5957\u8def\u4e0e\u4e0b\u4e00\u6b65\u5efa\u8bae<\/h2>\n<p>\u6309\u4e1a\u52a1\u51fa\u73b0\u9891\u7387\uff0c\u628a\u6162\u67e5\u8be2\u5f52\u5230\u56db\u7c7b\u5e38\u89c1\u573a\u666f\uff1a<\/p>\n<ul>\n<li>\u8303\u56f4\u67e5\u8be2\u62d6\u6162\uff1a\u5728\u8303\u56f4\u5b57\u6bb5\u540e\u9762\u8ffd\u52a0\u6392\u5e8f\u5b57\u6bb5\u505a\u8054\u5408\u7d22\u5f15<\/li>\n<li>\u5206\u9875\u6df1\u7ffb\u62d6\u6162\uff1a\u7528\u4e3b\u952e cursor \u66ff\u4ee3 LIMIT offset<\/li>\n<li>IN \u5927\u96c6\u5408\u62d6\u6162\uff1a\u628a IN \u5217\u8868\u6362\u6210\u4e34\u65f6\u8868 join\uff0c\u6216\u5bf9\u5b50\u67e5\u8be2\u5b57\u6bb5\u52a0\u7d22\u5f15<\/li>\n<li>\u6a21\u7cca\u5339\u914d\u62d6\u6162\uff1aLIKE \u524d\u7f00\u786e\u5b9a\u7684\u53ef\u52a0 BTREE \u7d22\u5f15\uff0c\u5168\u6a21\u7cca\u6539\u8d70\u5168\u6587\u7d22\u5f15\u6216\u5916\u90e8\u68c0\u7d22<\/li>\n<\/ul>\n<p>\u6bcf\u4e00\u7c7b\u573a\u666f\u5728 EXPLAIN \u4e0a\u90fd\u6709\u5178\u578b\u7279\u5f81\uff0c\u56e2\u961f\u53ef\u4ee5\u628a\u8fd9\u4efd\u5bf9\u7167\u8868\u6c89\u6dc0\u6210\u5185\u90e8 wiki\uff0c\u65b0\u4eba\u9047\u5230\u6162 SQL \u76f4\u63a5\u5bf9\u53f7\u5165\u5ea7\u3002\u5b8c\u6210\u4f18\u5316\u540e\uff0c\u5efa\u8bae\u628a long_query_time \u8c03\u5230 0.3 \u79d2\u505a\u4e8c\u6b21\u626b\u63cf\uff0c\u518d\u7528 pt-query-digest \u505a\u524d\u540e\u5bf9\u6bd4\uff0c\u786e\u8ba4 top SQL \u7684\u8017\u65f6\u5206\u5e03\u771f\u7684\u4e0b\u964d\u3002\u5982\u679c\u4f60\u7684 WordPress \u7ad9\u70b9\u4e5f\u9762\u4e34\u6570\u636e\u5e93\u74f6\u9888\uff0c\u5efa\u8bae\u7ed3\u5408<a href=\"https:\/\/cn.hostease.com\/blog\/guides\/wordpress-hk-hosting-guide\/\">WordPress \u9999\u6e2f\u4e3b\u673a\u8d2d\u4e70\u6307\u5357<\/a>\u91cc\u7684\u4e3b\u673a\u9009\u578b\u4e0e<a href=\"https:\/\/cn.hostease.com\/blog\/wordpress\/wordpress-w3-total-cache-tuning\/\">WordPress \u6027\u80fd\u8c03\u4f18\u5b9e\u6218<\/a>\u7684\u5bf9\u8c61\u7f13\u5b58\u7b56\u7565\u4e00\u8d77\u505a\uff0c\u7f13\u5b58\u5c42\u80fd\u62e6\u622a 60% \u4ee5\u4e0a\u7684\u91cd\u590d\u67e5\u8be2\u3002\u603b\u7ed3\u6765\u8bf4\uff0c\u6162\u67e5\u8be2\u65e5\u5fd7\u662f\u6392\u67e5 MySQL \u6027\u80fd\u95ee\u9898\u6700\u6709\u6548\u7684\u5165\u53e3\uff0c\u5efa\u8bae\u4f60\u4eca\u5929\u5c31\u5f00\u542f\u65e5\u5fd7\u3001\u91c7\u96c6 4 \u5c0f\u65f6\u3001\u8dd1\u4e00\u6b21 pt-query-digest\uff0c\u628a\u56e2\u961f\u7684\u4f18\u5316\u8282\u594f\u4ece\u88ab\u52a8\u6551\u706b\u5207\u6362\u5230\u4e3b\u52a8\u5de1\u68c0\uff0c\u518d\u628a\u53ef\u590d\u7528\u7684\u7d22\u5f15\u8bbe\u8ba1\u539f\u5219\u6c89\u6dc0\u8fdb\u4ee3\u7801\u8bc4\u5ba1\u6e05\u5355\u3002\u540e\u7eed\u53ef\u4ee5\u628a\u8fd9\u5957\u6d41\u7a0b\u63a5\u5165 Prometheus \u4e0e Grafana\uff0c\u505a\u5230 long_query_time 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