{"id":370,"date":"2026-02-04T10:54:10","date_gmt":"2026-02-04T02:54:10","guid":{"rendered":"http:\/\/47.100.165.17\/wordpress\/?p=370"},"modified":"2026-02-04T10:54:10","modified_gmt":"2026-02-04T02:54:10","slug":"%e3%80%90mysql%e3%80%91%e6%85%a2%e6%9f%a5%e8%af%a2%e6%97%a5%e5%bf%97-slow-log-%ef%bc%9a%e5%ae%9a%e4%bd%8d%e4%bd%8e%e6%95%88-sql","status":"publish","type":"post","link":"https:\/\/yunyanglib.cn\/?p=370","title":{"rendered":"\u3010MySQL\u3011\u6162\u67e5\u8be2\u65e5\u5fd7 Slow Log \uff1a\u5b9a\u4f4d\u4f4e\u6548 SQL"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\" id=\"u610236e1\">\u5728 MySQL \u6570\u636e\u5e93\u8fd0\u7ef4\u4e2d\uff0cSQL \u8bed\u53e5\u7684\u6267\u884c\u6548\u7387\u76f4\u63a5\u5f71\u54cd\u7cfb\u7edf\u54cd\u5e94\u901f\u5ea6\u3002\u5f53\u7f51\u7ad9\u51fa\u73b0\u5361\u987f\u3001\u63a5\u53e3\u8d85\u65f6\u7b49\u95ee\u9898\u65f6\uff0c<strong>\u6162\u67e5\u8be2\u65e5\u5fd7\uff08Slow Log\uff09<\/strong> \u5f80\u5f80\u662f\u5b9a\u4f4d\u4f4e\u6548 SQL \u7684 \u201c\u7b2c\u4e00\u624b\u8bc1\u636e\u201d\u3002\u5b83\u80fd\u8bb0\u5f55\u6240\u6709\u6267\u884c\u65f6\u95f4\u8d85\u8fc7\u9608\u503c\u7684 SQL \u8bed\u53e5\uff0c\u5e2e\u52a9\u6211\u4eec\u7cbe\u51c6\u9501\u5b9a\u6027\u80fd\u74f6\u9888 \u2014\u2014 \u65e0\u8bba\u662f\u5168\u8868\u626b\u63cf\u3001\u7d22\u5f15\u7f3a\u5931\uff0c\u8fd8\u662f JOIN \u903b\u8f91\u4e0d\u5408\u7406\uff0c\u90fd\u80fd\u901a\u8fc7\u6162\u67e5\u8be2\u65e5\u5fd7\u4e00\u63a2\u7a76\u7adf\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"lgnRi\">\u4e00\u3001\u6162\u67e5\u8be2\u65e5\u5fd7\u57fa\u7840\u914d\u7f6e<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"GLGKh\">1. \u67e5\u770b\u5f53\u524d\u6162\u67e5\u8be2\u72b6\u6001<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u9996\u5148\u901a\u8fc7 MySQL \u547d\u4ee4\u884c\u67e5\u770b\u9ed8\u8ba4\u914d\u7f6e\uff0c\u786e\u8ba4\u6162\u67e5\u8be2\u65e5\u5fd7\u662f\u5426\u542f\u7528\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>-- \u67e5\u770b\u6162\u67e5\u8be2\u65e5\u5fd7\u542f\u7528\u72b6\u6001\uff08ON\/OFF\uff09\nshow variables like 'slow_query_log';\n-- \u67e5\u770b\u6162\u67e5\u8be2\u9608\u503c\uff08\u5355\u4f4d\uff1a\u79d2\uff0c\u9ed8\u8ba410\u79d2\uff09\nshow variables like 'long_query_time';\n-- \u67e5\u770b\u6162\u67e5\u8be2\u65e5\u5fd7\u5b58\u50a8\u8def\u5f84\nshow variables like 'slow_query_log_file';<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1005\" height=\"501\" src=\"http:\/\/47.100.165.17\/wordpress\/wp-content\/uploads\/2026\/02\/image-43.png\" alt=\"\" class=\"wp-image-379\" srcset=\"https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-43.png 1005w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-43-300x150.png 300w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-43-768x383.png 768w\" sizes=\"(max-width: 1005px) 100vw, 1005px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">2. \u4e34\u65f6\u542f\u7528\u6162\u67e5\u8be2\u65e5\u5fd7\uff08\u91cd\u542f\u5931\u6548\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u9002\u5408\u4e34\u65f6\u6392\u67e5\u95ee\u9898\uff0c\u65e0\u9700\u91cd\u542f MySQL \u670d\u52a1\uff1a<\/p>\n\n\n\n<pre id=\"ctkIP\" class=\"wp-block-code\"><code>-- \u542f\u7528\u6162\u67e5\u8be2\u65e5\u5fd7\nset global slow_query_log = 'ON';\n\n-- \u8bbe\u7f6e\u65e5\u5fd7\u5b58\u50a8\u8def\u5f84\nset global slow_query_log_file = '\/data\/mysql\/log\/mysql-slow.log';\n\n-- \u8bbe\u7f6e\u9608\u503c\u4e3a 1 \u79d2\uff08\u6267\u884c\u65f6\u95f4\u22651\u79d2\u7684SQL\u4f1a\u88ab\u8bb0\u5f55\uff09\nset global long_query_time = 1;\n\n-- \u8bb0\u5f55\u672a\u4f7f\u7528\u7d22\u5f15\u7684SQL\uff08\u53ef\u9009\uff0c\u8c28\u614e\u542f\u7528\uff0c\u53ef\u80fd\u4ea7\u751f\u5927\u91cf\u65e5\u5fd7\uff09\nset global log_queries_not_using_indexes = 'ON';<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6ce8\u610f\uff1a<code>long_query_time<\/code> \u751f\u6548\u540e\uff0c\u4ec5\u65b0\u8fde\u63a5\u7684 SQL \u4f1a\u91c7\u7528\u65b0\u9608\u503c\uff0c\u73b0\u6709\u8fde\u63a5\u9700\u91cd\u65b0\u8fde\u63a5\u624d\u751f\u6548\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"AWERj\">3. \u6c38\u4e45\u542f\u7528\u6162\u67e5\u8be2\u65e5\u5fd7\uff08\u63a8\u8350\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u4fee\u6539 MySQL \u914d\u7f6e\u6587\u4ef6\uff08<code>my.cnf <\/code>\u6216 <code>my.ini<\/code>\uff09\uff0c\u91cd\u542f\u540e\u751f\u6548\uff1a<\/p>\n\n\n\n<pre id=\"Zs58R\" class=\"wp-block-code\"><code># 1. \u7f16\u8f91\u914d\u7f6e\u6587\u4ef6\nvim \/data\/mysql\/conf\/my.cnf\n\n# 2. \u6dfb\u52a0\u914d\u7f6e\n&#91;mysqld]\n# \u542f\u7528\u6162\u67e5\u8be2\u65e5\u5fd7\nslow_query_log = 1\n# \u65e5\u5fd7\u6587\u4ef6\u8def\u5f84\uff08\u5efa\u8bae\u653e\u5728\u975e\u7cfb\u7edf\u76d8\uff0c\u907f\u514d\u5360\u7528\u7cfb\u7edf\u7a7a\u95f4\uff09\nslow_query_log_file = \/data\/mysql\/log\/mysql-slow.log\n# \u6162\u67e5\u8be2\u9608\u503c\uff08\u5efa\u8bae\u751f\u4ea7\u73af\u5883\u8bbe\u4e3a 1-3 \u79d2\uff09\nlong_query_time = 1\n# \u8bb0\u5f55\u672a\u4f7f\u7528\u7d22\u5f15\u7684SQL\uff08\u6309\u9700\u542f\u7528\uff09\nlog_queries_not_using_indexes = 1\n# \u8bb0\u5f55\u7ba1\u7406\u8bed\u53e5\uff08\u5982 ALTER TABLE\uff0c\u53ef\u9009\uff09\nlog_slow_admin_statements = 1\n\n# 3. \u91cd\u542f MySQL \u670d\u52a1\n\/etc\/init.d\/mysql.server restart<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"uRTh2\">7.2 Slow Log \u8fdb\u9636\u914d\u7f6e<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"u05943b08\">\u9664\u57fa\u7840\u9608\u503c\u5916\uff0c\u8fd8\u53ef\u914d\u7f6e\u4ee5\u4e0b\u53c2\u6570\u589e\u5f3a\u6162\u67e5\u8be2\u8bb0\u5f55\u80fd\u529b\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u8bb0\u5f55\u7ba1\u7406\u8bed\u53e5\uff08\u5982 ALTER\u3001DROP\uff09<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<pre id=\"Aq4hs\" class=\"wp-block-code\"><code># \u52a8\u6001\u5f00\u542f\uff08\u6c38\u4e45\u5f00\u542f\u9700\u6dfb\u52a0\u5230\u914d\u7f6e\u6587\u4ef6\uff09\nset global log_slow_admin_statements = on;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"u3dc8f4ba\">\u4f5c\u7528\uff1a\u7ba1\u7406\u8bed\u53e5\u6267\u884c\u65f6\u95f4\u53ef\u80fd\u8f83\u957f\uff08\u5982 <code>ALTER TABLE<\/code> \u52a0\u7d22\u5f15\uff09\uff0c\u8bb0\u5f55\u540e\u4fbf\u4e8e\u6392\u67e5\u8fd0\u7ef4\u64cd\u4f5c\u5bfc\u81f4\u7684\u6027\u80fd\u95ee\u9898\u3002<\/p>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u8bb0\u5f55\u672a\u4f7f\u7528\u7d22\u5f15\u7684\u67e5\u8be2<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<pre id=\"DKjYN\" class=\"wp-block-code\"><code>set global log_queries_not_using_indexes = on;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"u4b43124e\">\u4f5c\u7528\uff1a\u5373\u4f7f\u67e5\u8be2\u6267\u884c\u65f6\u95f4\u672a\u8d85\u8fc7\u9608\u503c\uff0c\u82e5\u672a\u4f7f\u7528\u7d22\u5f15\uff08\u53ef\u80fd\u5bfc\u81f4\u5168\u8868\u626b\u63cf\uff09\uff0c\u4e5f\u4f1a\u8bb0\u5f55\u5230 Slow Log\uff0c\u63d0\u524d\u53d1\u73b0\u4f4e\u6548 SQL\u3002<\/p>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u8bbe\u7f6e\u68c0\u67e5\u884c\u6570\u9608\u503c<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<pre id=\"GQhNE\" class=\"wp-block-code\"><code># \u67e5\u770b\u5f53\u524d\u914d\u7f6e\nshow global variables like \"min_examined_row_limit\";\n\n# \u8bbe\u7f6e\u4e3a 0\uff08\u8bb0\u5f55\u6240\u6709\u7b26\u5408\u6761\u4ef6\u7684\u6162\u67e5\u8be2\uff0c\u4e0d\u9650\u5236\u68c0\u67e5\u884c\u6570\uff09\nset global min_examined_row_limit = 0;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"ud0127a4a\">\u4f5c\u7528\uff1a\u907f\u514d\u56e0\u300c\u68c0\u67e5\u884c\u6570\u5c11\u300d\u800c\u5ffd\u7565\u6162\u67e5\u8be2\uff08\u5982\u5168\u8868\u626b\u63cf 100 \u884c\u4f46\u8017\u65f6 2 \u79d2\u7684 SQL\uff09\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"917\" height=\"495\" src=\"http:\/\/47.100.165.17\/wordpress\/wp-content\/uploads\/2026\/02\/image-44.png\" alt=\"\" class=\"wp-image-380\" srcset=\"https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-44.png 917w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-44-300x162.png 300w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-44-768x415.png 768w\" sizes=\"(max-width: 917px) 100vw, 917px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"veKuK\">\u4e8c\u3001\u6162\u67e5\u8be2\u65e5\u5fd7\u5206\u6790\u65b9\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"gXy6e\">1. \u76f4\u63a5\u67e5\u770b\u65e5\u5fd7\u6587\u4ef6<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u6162\u67e5\u8be2\u65e5\u5fd7\u4e3a\u6587\u672c\u683c\u5f0f\uff0c\u53ef\u901a\u8fc7 <code>cat<\/code>\u3001<code>tail<\/code> \u7b49\u547d\u4ee4\u76f4\u63a5\u67e5\u770b\uff1a<\/p>\n\n\n\n<pre id=\"lWgCh\" class=\"wp-block-code\"><code># \u67e5\u770b\u6700\u65b010\u6761\u6162\u67e5\u8be2\ntail -n 10 \/data\/mysql\/log\/mysql-slow.log\n# \u641c\u7d22\u5305\u542b\u7279\u5b9a\u5b57\u6bb5\u7684\u6162\u67e5\u8be2\ngrep 'insert' \/data\/mysql\/log\/mysql-slow.log<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"326\" src=\"http:\/\/47.100.165.17\/wordpress\/wp-content\/uploads\/2026\/02\/image-45-1024x326.png\" alt=\"\" class=\"wp-image-382\" srcset=\"https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-45-1024x326.png 1024w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-45-300x96.png 300w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-45-768x245.png 768w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-45.png 1033w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"udbdb52be\">\u65e5\u5fd7\u683c\u5f0f\u89e3\u6790\uff08\u5173\u952e\u5b57\u6bb5\uff09\uff1a<\/p>\n\n\n\n<pre id=\"X0PXK\" class=\"wp-block-code\"><code># Time: 2026-02-04T02:37:11.367549Z    # \u6267\u884c\u65f6\u95f4\n# User@Host: root&#91;root] @ localhost &#91;]  Id:    11   # \u6267\u884c\u7528\u6237\u4e0e\u4e3b\u673a\n# Query_time: 2.011508  Lock_time: 0.000000 Rows_sent: 1  Rows_examined: 1  # \u8017\u65f6\u3001\u9501\u65f6\u95f4\u3001\u8fd4\u56de\u884c\u6570\u3001\u68c0\u67e5\u884c\u6570\nSET timestamp=1770172629;  # \u65f6\u95f4\u6233\nselect sleep(2);  # \u5177\u4f53 SQL<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>Query_time<\/code>\uff1aSQL \u6267\u884c\u65f6\u95f4\uff08\u79d2\uff09 <\/li>\n\n\n\n<li><code>Lock_time<\/code>\uff1a\u9501\u7b49\u5f85\u65f6\u95f4\uff08\u79d2\uff09 <\/li>\n\n\n\n<li><code>Rows_sent<\/code>\uff1a\u8fd4\u56de\u7ed3\u679c\u884c\u6570 <\/li>\n\n\n\n<li><code>Rows_examined<\/code>\uff1a\u626b\u63cf\u7684\u884c\u6570\uff08\u6570\u503c\u8d8a\u5927\u8d8a\u53ef\u80fd\u5b58\u5728\u4f18\u5316\u7a7a\u95f4\uff09<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"o7YeM\">2. \u4f7f\u7528 mysqldumpslow \u5de5\u5177\u5206\u6790<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"ud373ae2a\">MySQL \u81ea\u5e26\u7684\u65e5\u5fd7\u5206\u6790\u5de5\u5177\uff0c\u53ef\u7edf\u8ba1\u6162\u67e5\u8be2\u7684\u9891\u7387\u3001\u5e73\u5747\u6267\u884c\u65f6\u95f4\u7b49\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u57fa\u7840\u5206\u6790\uff08\u6309\u9ed8\u8ba4\u89c4\u5219\u6392\u5e8f\uff09<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<pre id=\"vo2hQ\" class=\"wp-block-code\"><code># \u5206\u6790\u6162\u67e5\u8be2\u65e5\u5fd7\nmysqldumpslow \/data\/mysql\/log\/mysql-slow.log<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"337\" src=\"http:\/\/47.100.165.17\/wordpress\/wp-content\/uploads\/2026\/02\/image-46-1024x337.png\" alt=\"\" class=\"wp-image-383\" srcset=\"https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-46-1024x337.png 1024w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-46-300x99.png 300w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-46-768x253.png 768w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-46.png 1098w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u6309\u8017\u65f6\u6392\u5e8f\uff08\u663e\u793aTOP10\uff09<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<pre id=\"ceO6a\" class=\"wp-block-code\"><code># \u7edf\u8ba1\u5e73\u5747\u6267\u884c\u65f6\u95f4\u6700\u957f\u7684\u524d10\u6761\u6162\u67e5\u8be2\nmysqldumpslow -s t -t 10 \/data\/mysql\/log\/mysql-slow.log<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"396\" src=\"http:\/\/47.100.165.17\/wordpress\/wp-content\/uploads\/2026\/02\/image-47-1024x396.png\" alt=\"\" class=\"wp-image-384\" srcset=\"https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-47-1024x396.png 1024w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-47-300x116.png 300w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-47-768x297.png 768w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-47.png 1090w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u6309\u6267\u884c\u6b21\u6570\u6392\u5e8f\uff08\u663e\u793aTOP10\uff09<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<pre id=\"xZR98\" class=\"wp-block-code\"><code># \u7edf\u8ba1\u6267\u884c\u6b21\u6570\u6700\u591a\u7684\u524d10\u6761\u6162\u67e5\u8be2\nmysqldumpslow -s c -t 10 \/data\/mysql\/log\/mysql-slow.log<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"374\" src=\"http:\/\/47.100.165.17\/wordpress\/wp-content\/uploads\/2026\/02\/image-48-1024x374.png\" alt=\"\" class=\"wp-image-385\" srcset=\"https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-48-1024x374.png 1024w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-48-300x109.png 300w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-48-768x280.png 768w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-48.png 1102w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\">\n<li><strong>\u8fc7\u6ee4\u7279\u5b9a\u6570\u636e\u5e93\u7684\u6162\u67e5\u8be2<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<pre id=\"Z5T67\" class=\"wp-block-code\"><code># -d maria\uff1a\u4ec5\u5206\u6790 maria \u5e93\u7684\u6162\u67e5\u8be2\nmysqldumpslow -d maria \/data\/mysql\/log\/mysql-slow.log<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"727\" src=\"http:\/\/47.100.165.17\/wordpress\/wp-content\/uploads\/2026\/02\/image-49-1024x727.png\" alt=\"\" class=\"wp-image-387\" srcset=\"https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-49-1024x727.png 1024w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-49-300x213.png 300w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-49-768x545.png 768w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-49.png 1082w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">     5. <strong>\u7b5b\u9009\u5305\u542b JOIN \u7684\u6162\u67e5\u8be2<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># \u7b5b\u9009\u5305\u542b JOIN \u7684\u6162\u67e5\u8be2\nmysqldumpslow -g 'JOIN' \/data\/mysql\/log\/mysql-slow.log<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"977\" height=\"180\" src=\"http:\/\/47.100.165.17\/wordpress\/wp-content\/uploads\/2026\/02\/image-50.png\" alt=\"\" class=\"wp-image-388\" srcset=\"https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-50.png 977w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-50-300x55.png 300w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-50-768x141.png 768w\" sizes=\"(max-width: 977px) 100vw, 977px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u53c2\u6570\u8bf4\u660e\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>-s<\/code>\uff1a\u6392\u5e8f\u65b9\u5f0f\uff08c = \u6267\u884c\u6b21\u6570\uff0ct = \u6267\u884c\u65f6\u95f4\uff0cl = \u9501\u5b9a\u65f6\u95f4\uff0cr = \u8fd4\u56de\u884c\u6570\uff09<\/li>\n\n\n\n<li><code>-t<\/code>\uff1a\u663e\u793a\u6761\u6570<\/li>\n\n\n\n<li><code>-g<\/code>\uff1a\u6b63\u5219\u5339\u914d\u7b5b\u9009<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. \u7b2c\u4e09\u65b9\u5de5\u5177\u63a8\u8350\uff08\u8fdb\u9636\uff09<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>pt-query-digest<\/strong>\uff08Percona Toolkit\uff09\uff1a\u529f\u80fd\u5f3a\u5927\uff0c\u652f\u6301\u6309 SQL \u6a21\u677f\u5206\u7ec4\u3001\u7edf\u8ba1\u767e\u5206\u6bd4\uff0c\u751f\u6210\u8be6\u7ec6\u5206\u6790\u62a5\u544a<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>pt-query-digest \/data\/mysql\/log\/mysql-slow.log > slow_analysis.report<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>MySQL Workbench<\/strong>\uff1a\u53ef\u89c6\u5316\u5de5\u5177\uff0c\u53ef\u901a\u8fc7 \u201cPerformance\u201d \u6a21\u5757\u5bfc\u5165\u6162\u67e5\u8be2\u65e5\u5fd7\uff0c\u751f\u6210\u56fe\u8868\u5316\u5206\u6790\u7ed3\u679c<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"kEyTO\">\u4e09\u3001 \u6162\u67e5\u8be2\u989d\u5916\u4fe1\u606f\u8f93\u51fa\uff08MySQL 8.0.14+\uff09<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"u4d4c81f7\">MySQL 8.0.14 \u65b0\u589e <code>log_slow_extra<\/code> \u53c2\u6570\uff0c\u5f00\u542f\u540e\u53ef\u8bb0\u5f55\u66f4\u591a\u6162\u67e5\u8be2\u7ec6\u8282\uff08\u5982\u5168\u8868\u626b\u63cf\u6807\u8bb0\u3001\u4e34\u65f6\u8868\u4f7f\u7528\u60c5\u51b5\uff09\uff1a<\/p>\n\n\n\n<pre id=\"cSEkl\" class=\"wp-block-code\"><code># \u5f00\u542f\u989d\u5916\u4fe1\u606f\u8f93\u51fa\nset global log_slow_extra = on;\n\n# \u751f\u6210\u6162\u67e5\u8be2\nselect sleep(2);\n\n# \u67e5\u770b\u65e5\u5fd7\uff08\u65b0\u589e\u4fe1\u606f\u5982 \"Rows_affected: 0\"\u3001\"Full_scan: Yes\"\uff09\ntail \/data\/mysql\/log\/mysql-slow.log<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"980\" height=\"553\" src=\"http:\/\/47.100.165.17\/wordpress\/wp-content\/uploads\/2026\/02\/image-51.png\" alt=\"\" class=\"wp-image-389\" srcset=\"https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-51.png 980w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-51-300x169.png 300w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-51-768x433.png 768w\" sizes=\"(max-width: 980px) 100vw, 980px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"151\" src=\"http:\/\/47.100.165.17\/wordpress\/wp-content\/uploads\/2026\/02\/image-52-1024x151.png\" alt=\"\" class=\"wp-image-390\" srcset=\"https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-52-1024x151.png 1024w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-52-300x44.png 300w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-52-768x113.png 768w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-52-1536x227.png 1536w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-52.png 1892w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u6162\u67e5\u8be2\u4f18\u5316\u5b9e\u64cd\u6848\u4f8b<\/h2>\n\n\n\n<h4 class=\"wp-block-heading\">\u6848\u4f8b 1\uff1a\u672a\u4f7f\u7528\u7d22\u5f15\u5bfc\u81f4\u5168\u8868\u626b\u63cf<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u6162\u67e5\u8be2\u65e5\u5fd7\u4e2d\u53d1\u73b0\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Query_time: 4.5  Rows_examined: 50000  Rows_sent: 10\nSELECT * FROM order_info WHERE create_time >= '2024-01-01';<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4f18\u5316\u65b9\u6848<\/strong>\uff1a\u4e3a <code>create_time<\/code> \u5b57\u6bb5\u6dfb\u52a0\u7d22\u5f15<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ALTER TABLE order_info ADD INDEX idx_create_time (create_time);<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f18\u5316\u540e\u6548\u679c\uff1a<code>Query_time<\/code> \u964d\u81f3 0.01 \u79d2\uff0c<code>Rows_examined<\/code> \u53d8\u4e3a 10\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u6848\u4f8b 2\uff1aJOIN \u8bed\u53e5\u7f3a\u5c11\u5173\u8054\u7d22\u5f15<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u6162\u67e5\u8be2\u65e5\u5fd7\u4e2d\u53d1\u73b0\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Query_time: 6.8  Rows_examined: 100000\nSELECT u.name, o.order_no FROM user u JOIN order o ON u.id = o.user_id WHERE o.status = 1;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4f18\u5316\u65b9\u6848<\/strong>\uff1a\u4e3a\u5173\u8054\u5b57\u6bb5 <code>o.user_id<\/code> \u6dfb\u52a0\u7d22\u5f15<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ALTER TABLE order ADD INDEX idx_user_id (user_id);<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u6848\u4f8b 3\uff1aSELECT * \u5bfc\u81f4\u65e0\u7528\u5b57\u6bb5\u626b\u63cf<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u6162\u67e5\u8be2\u65e5\u5fd7\u4e2d\u53d1\u73b0\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Query_time: 3.1  Rows_examined: 8000\nSELECT * FROM product WHERE category_id = 10;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4f18\u5316\u65b9\u6848<\/strong>\uff1a\u53ea\u67e5\u8be2\u9700\u8981\u7684\u5b57\u6bb5\uff0c\u907f\u514d\u5168\u5b57\u6bb5\u626b\u63cf<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT id, name, price FROM product WHERE category_id = 10;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e94\u3001\u6162\u67e5\u8be2\u65e5\u5fd7\u4f7f\u7528\u6ce8\u610f\u4e8b\u9879<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u63a7\u5236\u65e5\u5fd7\u5927\u5c0f<\/strong>\uff1a\n<ul class=\"wp-block-list\">\n<li>\u907f\u514d\u5c06 <code>long_query_time<\/code> \u8bbe\u7f6e\u8fc7\u5c0f\uff08\u5982 \uff09\uff0c\u5426\u5219\u4f1a\u4ea7\u751f\u5927\u91cf\u65e5\u5fd7\uff0c\u5360\u7528\u78c1\u76d8\u7a7a\u95f4\u5e76\u5f71\u54cd\u6027\u80fd<\/li>\n\n\n\n<li>\u5b9a\u671f\u8f6e\u8f6c\u65e5\u5fd7\uff08\u53ef\u901a\u8fc7 <code>logrotate<\/code> \u5de5\u5177\u6216 MySQL \u81ea\u5e26\u7684 <code>FLUSH LOGS<\/code> \u547d\u4ee4\uff09<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u751f\u4ea7\u73af\u5883\u8c28\u614e\u542f\u7528 \u201c\u672a\u4f7f\u7528\u7d22\u5f15\u65e5\u5fd7\u201d<\/strong>\uff1a\n<ul class=\"wp-block-list\">\n<li><code>log_queries_not_using_indexes = 1<\/code> \u4f1a\u8bb0\u5f55\u6240\u6709\u672a\u4f7f\u7528\u7d22\u5f15\u7684 SQL\uff0c\u5373\u4f7f\u6267\u884c\u65f6\u95f4\u5f88\u77ed\uff0c\u53ef\u80fd\u5bfc\u81f4\u65e5\u5fd7\u81a8\u80c0<\/li>\n\n\n\n<li>\u5efa\u8bae\u4ec5\u5728\u6392\u67e5\u7279\u5b9a\u95ee\u9898\u65f6\u4e34\u65f6\u542f\u7528<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u7ed3\u5408 EXPLAIN \u5206\u6790 SQL<\/strong>\uff1a\u5bf9\u4e8e\u6162\u67e5\u8be2\u65e5\u5fd7\u4e2d\u7684 SQL\uff0c\u4f7f\u7528 <code>EXPLAIN<\/code> \u67e5\u770b\u6267\u884c\u8ba1\u5212\uff0c\u660e\u786e\u4f18\u5316\u65b9\u5411\uff1a<\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>EXPLAIN SELECT * FROM user_info WHERE age > 30;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">      \u91cd\u70b9\u5173\u6ce8 <code>type<\/code>\uff08\u8bbf\u95ee\u7c7b\u578b\uff0c\u5982 ALL = \u5168\u8868\u626b\u63cf\u3001ref = \u7d22\u5f15\u67e5\u627e\uff09\u3001<code>key<\/code>\uff08\u4f7f\u7528\u7684\u7d22\u5f15\uff09\u3001<code>rows<\/code>\uff08\u9884\u8ba1\u626b\u63cf\u884c\u6570\uff09\u5b57\u6bb5\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u603b\u7ed3<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u6162\u67e5\u8be2\u65e5\u5fd7\u662f MySQL \u6027\u80fd\u4f18\u5316\u7684 \u201c\u5229\u5668\u201d\uff0c\u901a\u8fc7\u5408\u7406\u914d\u7f6e\u548c\u9ad8\u6548\u5206\u6790\uff0c\u80fd\u5feb\u901f\u5b9a\u4f4d\u4f4e\u6548 SQL \u5e76\u8fdb\u884c\u4f18\u5316\u3002\u6838\u5fc3\u6b65\u9aa4\u53ef\u6982\u62ec\u4e3a\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u542f\u7528\u6162\u67e5\u8be2\u65e5\u5fd7\uff0c\u8bbe\u7f6e\u5408\u7406\u9608\u503c<\/li>\n\n\n\n<li>\u5229\u7528\u5de5\u5177\u5206\u6790\u65e5\u5fd7\uff0c\u9501\u5b9a\u9ad8\u9891 \/ \u8017\u65f6 SQL<\/li>\n\n\n\n<li>\u901a\u8fc7\u6dfb\u52a0\u7d22\u5f15\u3001\u4f18\u5316 SQL \u8bed\u53e5\u7b49\u65b9\u5f0f\u89e3\u51b3\u74f6\u9888<\/li>\n\n\n\n<li>\u6301\u7eed\u76d1\u63a7\u65e5\u5fd7\uff0c\u9884\u9632\u6027\u80fd\u95ee\u9898\u590d\u53d1<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u638c\u63e1\u6162\u67e5\u8be2\u65e5\u5fd7\u7684\u4f7f\u7528\uff0c\u80fd\u8ba9\u6570\u636e\u5e93\u8fd0\u7ef4\u4ece \u201c\u88ab\u52a8\u6392\u67e5\u201d \u8f6c\u5411 \u201c\u4e3b\u52a8\u4f18\u5316\u201d\uff0c\u4e3a\u7cfb\u7edf\u7a33\u5b9a\u6027\u4fdd\u9a7e\u62a4\u822a\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 MySQL \u6570\u636e\u5e93\u8fd0\u7ef4\u4e2d\uff0cSQL \u8bed\u53e5\u7684\u6267\u884c\u6548\u7387\u76f4\u63a5\u5f71\u54cd\u7cfb\u7edf\u54cd\u5e94\u901f\u5ea6\u3002\u5f53\u7f51\u7ad9\u51fa\u73b0\u5361\u987f\u3001\u63a5\u53e3\u8d85\u65f6\u7b49\u95ee\u9898\u65f6\uff0c\u6162<\/p>\n<div class=\"more-link\">\n\t\t\t\t <a href=\"https:\/\/yunyanglib.cn\/?p=370\" class=\"link-btn theme-btn\"><span>Read More <\/span> <i class=\"fa fa-caret-right\"><\/i><\/a>\n\t\t\t<\/div>\n","protected":false},"author":1,"featured_media":392,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[16],"class_list":["post-370","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mysql","tag-mysql"],"_links":{"self":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/370","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=370"}],"version-history":[{"count":11,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/370\/revisions"}],"predecessor-version":[{"id":391,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/370\/revisions\/391"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/media\/392"}],"wp:attachment":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=370"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=370"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=370"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}