{"id":97702,"date":"2026-08-30T02:00:37","date_gmt":"2026-08-29T18:00:37","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/97702.html"},"modified":"2026-08-30T02:00:37","modified_gmt":"2026-08-29T18:00:37","slug":"%e8%af%a6%e8%a7%a3mysql-%e6%85%a2%e6%9f%a5%e8%af%a2%e6%97%a5%e5%bf%97-%e9%99%84%e8%af%a6%e7%bb%86%e6%a1%88%e4%be%8b","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/97702.html","title":{"rendered":"\u8be6\u89e3MySQL \u6162\u67e5\u8be2\u65e5\u5fd7( \u9644\u8be6\u7ec6\u6848\u4f8b )"},"content":{"rendered":"

\u6982\u5ff5<\/h2>\n

\u6162\u67e5\u8be2\u65e5\u5fd7（slow query log）\u662f MySQL \u8bb0\u5f55\u6267\u884c\u65f6\u95f4\u8d85\u8fc7\u6307\u5b9a\u9608\u503cSQL \u7684\u65e5\u5fd7，\u7528\u6765\u5b9a\u4f4d\u6162 SQL\u3001\u6027\u80fd\u74f6\u9888，\u662f SQL \u4f18\u5316\u6700\u57fa\u7840\u7684\u5de5\u5177\u3002<\/p>\n

\u4e00\u3001\u6162 SQL<\/h2>\n

\u6162 SQL \u4e0d\u662f\u8bed\u6cd5\u9519\u8bef\u7684 SQL，\u662f\u6267\u884c\u6548\u7387\u4f4e\u4e0b，\u6d88\u8017\u5927\u91cf\u6570\u636e\u5e93\u8d44\u6e90（CPU\u3001IO\u3001\u9501），\u6267\u884c\u8017\u65f6\u8f83\u957f\u7684 SQL \u8bed\u53e5\u3002 \u7b80\u5355\u8bf4：\u8dd1\u7684\u6162\u3001\u8017\u8d44\u6e90，\u62d6\u57ae MySQL \u7684 SQL，\u5c31\u53eb\u6162 SQL\u3002<\/p>\n

\u6162\u67e5\u8be2\u65e5\u5fd7\u53ea\u662f\u7528\u6765\u6355\u83b7\u6162 SQL \u7684\u5de5\u5177；\u6162 SQL \u662f\u5bf9\u8c61，\u6162\u67e5\u8be2\u65e5\u5fd7\u662f\u8bb0\u5f55\u5de5\u5177，\u4e8c\u8005\u4e0d\u8981\u6df7\u6dc6\u3002<\/p>\n

\u5224\u5b9a\u6807\u51c6<\/h3>\n

\u6709\u4e24\u4e2a\u6838\u5fc3\u5224\u65ad\u7ef4\u5ea6，\u4e0d\u80fd\u53ea\u770b\u6267\u884c\u65f6\u95f4<\/p>\n

  • \u6267\u884c\u8017\u65f6：\u8d85\u8fc7 long_query_time \u9608\u503c（\u6bd4\u5982 1s），\u6162\u67e5\u8be2\u65e5\u5fd7\u4f1a\u6355\u83b7\u3002<\/li>\n
  • \u626b\u63cf\u884c\u6570 (Rows_examined)：\u626b\u63cf\u5927\u91cf\u6570\u636e，\u54ea\u6015\u8fd4\u56de\u5f88\u5c11\u7ed3\u679c\u3001\u8017\u65f6\u5f88\u77ed，\u4f9d\u7136\u5c5e\u4e8e\u6f5c\u5728\u6162 SQL\u3002<\/li>\n

    \u4e3e\u4f8b：\u4e00\u6761 SQL \u6267\u884c 0.4 \u79d2，\u6ca1\u8fbe\u5230 1s \u9608\u503c\u4e0d\u4f1a\u8fdb\u6162\u65e5\u5fd7，\u4f46\u626b\u63cf 20 \u4e07\u884c\u3002\u6570\u636e\u91cf\u589e\u957f\u540e，\u672a\u6765\u4f1a\u53d8\u6210\u4e25\u91cd\u6162 SQL，\u8fd9\u5c31\u662f\u9690\u5f62\u6162 SQL，\u6700\u5bb9\u6613\u88ab\u5ffd\u7565\u3002<\/p>\n

    \u6162 SQL \u5e38\u89c1\u6210\u56e0<\/h3>\n

    1. \u7d22\u5f15\u95ee\u9898（\u5360 80% \u4ee5\u4e0a\u573a\u666f）<\/h4>\n
      \n
    • \u6ca1\u5efa\u7d22\u5f15，\u53d1\u751f\u5168\u8868\u626b\u63cf<\/li>\n
    • \u7d22\u5f15\u5931\u6548：\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362\u3001like %xxx\u3001or \u6761\u4ef6\u3001\u5bf9\u7d22\u5f15\u5217\u505a\u51fd\u6570\u8fd0\u7b97\u3001not in \u7b49<\/li>\n
    • \u7d22\u5f15\u9009\u62e9\u9519\u8bef：\u4f18\u5316\u5668\u9009\u9519\u7d22\u5f15<\/li>\n
    • \u7d22\u5f15\u533a\u5206\u5ea6\u5dee，\u4f4e\u9009\u62e9\u6027\u7d22\u5f15<\/li>\n<\/ul>\n

      2. SQL \u5199\u6cd5\u95ee\u9898<\/h4>\n
        \n
      • select * \u67e5\u8be2\u5927\u91cf\u4e0d\u9700\u8981\u5b57\u6bb5，\u56de\u8868\u5f00\u9500\u5927，\u7f51\u7edc\u4f20\u8f93\u91cf\u5927<\/li>\n
      • \u5927\u8868 join，\u5173\u8054\u5b57\u6bb5\u65e0\u7d22\u5f15<\/li>\n
      • \u4e0d\u5408\u7406\u5b50\u67e5\u8be2，\u884d\u751f\u8868\u6ca1\u6709\u7d22\u5f15<\/li>\n
      • limit \u5927\u504f\u79fb：limit 100000,10，\u626b\u63cf\u524d\u9762\u5341\u4e07\u884c<\/li>\n
      • in \u91cc\u9762\u653e\u6210\u5343\u4e0a\u4e07\u7684\u503c<\/li>\n
      • order by \/group by \u6ca1\u6709\u5408\u9002\u7d22\u5f15，\u89e6\u53d1\u6587\u4ef6\u6392\u5e8f\u3001\u4e34\u65f6\u8868<\/li>\n<\/ul>\n

        3. \u4e1a\u52a1 & \u6570\u636e\u5c42\u9762<\/h4>\n
          \n
        • \u5355\u8868\u6570\u636e\u91cf\u8fc7\u5927，\u5343\u4e07\u7ea7\u522b\u4ee5\u4e0a，\u6ca1\u6709\u5206\u5e93\u5206\u8868<\/li>\n
        • \u4e8b\u52a1\u8fc7\u5927：\u4e00\u4e2a\u4e8b\u52a1\u91cc\u9762\u6267\u884c\u5927\u91cf DML，\u9501\u6301\u6709\u65f6\u95f4\u957f，\u5bfc\u81f4\u5927\u91cf SQL \u963b\u585e\u7b49\u5f85\u9501<\/li>\n
        • \u6279\u91cf\u4e00\u6b21\u6027\u64cd\u4f5c\u6d77\u91cf\u6570\u636e<\/li>\n<\/ul>\n

          4. \u6570\u636e\u5e93\u73af\u5883\u56e0\u7d20<\/h4>\n
            \n
          • IO \u538b\u529b\u9ad8\u3001CPU \u6253\u6ee1，\u518d\u597d\u7684 SQL \u4e5f\u8dd1\u6162<\/li>\n
          • \u9501\u7b49\u5f85：\u4e0d\u662f SQL \u672c\u8eab\u6162，\u662f\u7b49\u884c\u9501 \/ \u8868\u9501，Lock_time\u5f88\u9ad8<\/li>\n
          • buffer pool \u592a\u5c0f，\u5927\u91cf\u6570\u636e\u8bfb\u78c1\u76d8\u800c\u4e0d\u662f\u5185\u5b58<\/li>\n<\/ul>\n

            \u6162 SQL \u5e26\u6765\u7684\u5371\u5bb3<\/h3>\n
          • CPU\/IO \u98d9\u5347，\u6570\u636e\u5e93\u6574\u4f53\u54cd\u5e94\u53d8\u6162<\/li>\n
          • \u9501\u7b49\u5f85\u5806\u79ef，\u8fde\u63a5\u6570\u6253\u6ee1，\u5e94\u7528\u62a5\u9519<\/li>\n
          • \u8fde\u9501\u96ea\u5d29：\u4e00\u6761\u6162 SQL \u5360\u6ee1\u8d44\u6e90，\u6b63\u5e38\u4e1a\u52a1 SQL \u4e5f\u88ab\u62d6\u6162<\/li>\n
          • \u4e3b\u4ece\u5ef6\u8fdf：\u5927 DML \u6162 SQL \u9020\u6210\u4ece\u5e93\u590d\u5236\u5ef6\u8fdf<\/li>\n

            \u5982\u4f55\u53d1\u73b0\u6162 SQL<\/h3>\n
          • \u6162\u67e5\u8be2\u65e5\u5fd7 slow_query_log：\u4e8b\u540e\u8bb0\u5f55\u5df2\u7ecf\u6267\u884c\u5b8c\u7684\u6162 SQL<\/li>\n
          • show processlist \/ show full processlist：\u6293\u6b63\u5728\u8fd0\u884c\u7684\u6162 SQL<\/li>\n
          • performance_schema：\u7ebf\u4e0a\u6301\u7eed\u76d1\u63a7 SQL \u6267\u884c\u6307\u6807<\/li>\n
          • APM \u5de5\u5177（SkyWalking \u7b49）：\u5e94\u7528\u4fa7\u4e0a\u62a5\u6162 SQL<\/li>\n
          • explain：\u62ff\u5230 SQL \u5206\u6790\u6267\u884c\u8ba1\u5212，\u770b type\u3001key\u3001rows\u3001Extra<\/li>\n

            \u5e38\u89c1\u8bef\u533a<\/h3>\n

            \u274c\u6162 SQL \u5c31\u662f\u6267\u884c\u65f6\u95f4\u5f88\u957f\u7684 SQL<\/p>\n

            \u9519，\u5b58\u5728\u5927\u91cf\u9690\u5f62\u6162 SQL：\u8017\u65f6\u77ed，\u4f46\u626b\u63cf\u884c\u6570\u5de8\u5927\u3002<\/p>\n

            \u274c\u6ca1\u51fa\u73b0\u5728\u6162\u67e5\u8be2\u65e5\u5fd7，\u5c31\u4e0d\u662f\u6162 SQL<\/p>\n

            \u9608\u503c\u8bbe\u7f6e\u8fc7\u9ad8，\u9690\u5f62\u6162 SQL \u4e0d\u4f1a\u843d\u65e5\u5fd7\u3002<\/p>\n

            \u274c\u00a0explain \u770b\u5230 type \u4e0d\u662f ALL \u5c31\u6ca1\u95ee\u9898<\/p>\n

            range \u4e5f\u53ef\u80fd\u626b\u63cf\u51e0\u5341\u4e07\u884c，\u4f9d\u7136\u662f\u6162 SQL\u3002<\/p>\n

            \u274c\u6d4b\u8bd5\u73af\u5883\u8dd1\u5f88\u5feb，\u7ebf\u4e0a\u5c31\u662f\u6162<\/p>\n

            \u6d4b\u8bd5\u5e93\u6570\u636e\u91cf\u5c0f，\u770b\u4e0d\u51fa\u5168\u8868\u626b\u63cf\u95ee\u9898；\u7ebf\u4e0a\u771f\u5b9e\u6570\u636e\u91cf\u624d\u4f1a\u66b4\u9732\u3002<\/p>\n

            \u7b80\u5355\u4f8b\u5b50<\/p>\n

            — \u574f：name\u65e0\u7d22\u5f15，\u5168\u8868\u626b\u63cf\u767e\u4e07\u884c
            \nselect * from user where name = '\u5f20\u4e09';<\/p>\n

            — \u574f：\u5927\u504f\u79fb\u5206\u9875，\u626b\u63cf\u524d\u976210\u4e07\u884c
            \nselect id,name from order limit 100000,10;<\/p>\n

            — \u574f：\u7d22\u5f15\u5217\u4e0a\u7528\u51fd\u6570，\u7d22\u5f15\u5931\u6548
            \nselect * from user where DATE(create_time)='2026\u201108\u201127';<\/p>\n

            \u6162 SQL \u548c\u6162\u67e5\u8be2\u65e5\u5fd7\u7684\u533a\u522b<\/p>\n

              \n
            • \u6162 SQL：\u4f4e\u6548 SQL \u8bed\u53e5\u672c\u8eab<\/li>\n
            • \u6162\u67e5\u8be2\u65e5\u5fd7：MySQL \u63d0\u4f9b\u8bb0\u5f55\u6162 SQL \u7684\u65e5\u5fd7\u6587\u4ef6，\u662f\u53d1\u73b0\u6162 SQL \u7684\u624b\u6bb5\u3002<\/li>\n<\/ul>\n

              \u4e8c\u3001\u6162 SQL\u65e5\u5fd7<\/h2>\n

              1. \u6838\u5fc3\u53c2\u6570<\/h3>\n\n\u53c2\u6570\u8bf4\u660e<\/tr>\n\n\n\n\n\n\n\n
              slow_query_log<\/td>\n\u662f\u5426\u5f00\u542f\u6162\u67e5\u8be2\u65e5\u5fd7：ON\u5f00\u542f，OFF\u5173\u95ed，\u9ed8\u8ba4 OFF<\/td>\n<\/tr>\n
              slow_query_log_file<\/td>\n\u6162\u65e5\u5fd7\u6587\u4ef6\u8def\u5f84，\u4f8b\u5982 \/var\/lib\/mysql\/mysql-slow.log<\/td>\n<\/tr>\n
              long_query_time<\/td>\n\u6162\u67e5\u8be2\u9608\u503c，\u5355\u4f4d\u79d2，SQL \u6267\u884c\u65f6\u95f4\u8d85\u8fc7\u8be5\u503c\u5c31\u8bb0\u5f55；\u9ed8\u8ba4 10 \u79d2，\u53ef\u4ee5\u8bbe\u7f6e\u5c0f\u6570\u59820.5\u4ee3\u8868 500ms<\/td>\n<\/tr>\n
              log_queries_not_using_indexes<\/td>\n\u8bb0\u5f55\u6ca1\u6709\u4f7f\u7528\u7d22\u5f15\u7684 SQL，\u5373\u4f7f\u6267\u884c\u65f6\u95f4\u6ca1\u8fbe\u5230 long_query_time，\u751f\u4ea7\u8c28\u614e\u5f00\u542f，\u5927\u5e93\u4f1a\u4ea7\u751f\u5927\u91cf\u65e5\u5fd7<\/td>\n<\/tr>\n
              log_throttle_queries_not_using_indexes<\/td>\n\u9650\u5236\u6bcf\u5206\u949f\u8bb0\u5f55\u65e0\u7d22\u5f15 SQL \u7684\u6761\u6570，\u9632\u6b62\u65e5\u5fd7\u7206\u76d8，\u914d\u5408\u4e0a\u9762\u53c2\u6570\u4f7f\u7528<\/td>\n<\/tr>\n
              log_output<\/td>\n\u65e5\u5fd7\u8f93\u51fa\u65b9\u5f0f：FILE\u6587\u4ef6；TABLE\u5b58\u5165 mysql.slow_log \u8868；FILE,TABLE\u4e24\u8005\u540c\u65f6<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

              \u6ce8\u610f：long_query_time\u7edf\u8ba1\u7684\u662f\u5b9e\u9645\u6267\u884c\u65f6\u95f4，\u4e0d\u5305\u542b\u9501\u7b49\u5f85\u65f6\u95f4\u3002SQL \u547d\u4e2d\u6162\u67e5\u8be2\u6761\u4ef6\u624d\u5199\u5165\u65e5\u5fd7\u3002<\/p>\n

              2. \u5f00\u542f\u6162\u67e5\u8be2<\/h3>\n

              \u65b9\u5f0f 1：\u4e34\u65f6\u5f00\u542f（\u91cd\u542f MySQL \u5931\u6548）<\/p>\n

              set global slow_query_log = ON;
              \nset global long_query_time = 1; — \u8d85\u8fc71\u79d2\u5c31\u8bb0\u5f55
              \nset global log_queries_not_using_indexes = OFF;<\/p>\n

              global \u4fee\u6539\u540e，\u5df2\u5efa\u7acb\u7684\u4f1a\u8bdd\u4e0d\u751f\u6548，\u9700\u8981\u91cd\u65b0\u8fde\u63a5\u6570\u636e\u5e93\u3002<\/p>\n

              \u65b9\u5f0f 2：\u6c38\u4e45\u914d\u7f6e my.cnf\/my.ini<\/p>\n

              [mysqld]
              \nslow_query_log = 1
              \nslow_query_log_file = \/var\/lib\/mysql\/mysql-slow.log
              \nlong_query_time = 1
              \nlog_queries_not_using_indexes = 0
              \nlog_output = FILE<\/p>\n

              \u26a0\ufe0f：\u4fee\u6539\u914d\u7f6e\u6587\u4ef6\u9700\u8981\u91cd\u542f MySQL \u670d\u52a1\u3002<\/p>\n

              \u67e5\u770b\u5f53\u524d\u914d\u7f6e<\/p>\n

              show variables like '%slow_query%';
              \nshow variables like 'long_query_time';<\/p>\n

              3. \u6162\u67e5\u8be2\u65e5\u5fd7\u6587\u4ef6\u5185\u5bb9\u89e3\u8bfb<\/h3>\n

              \u793a\u4f8b\u65e5\u5fd7\u7247\u6bb5：<\/p>\n

              # Time: 260827 10:20:30
              \n# User@Host: root[root] @ localhost [] Id: 12
              \n# Query_time: 2.345678 Lock_time: 0.000123 Rows_sent: 100 Rows_examined: 100000
              \nSET timestamp=1787826030;
              \nselect * from big_table where name='xxx';<\/p>\n

              \u5b57\u6bb5\u91ca\u4e49：<\/p>\n

            • Query_time：SQL \u5b9e\u9645\u6267\u884c\u8017\u65f6 2.34s（\u6838\u5fc3\u6307\u6807）<\/li>\n
            • Lock_time：\u7b49\u5f85\u9501\u7684\u65f6\u95f4<\/li>\n
            • Rows_sent：\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef\u884c\u6570<\/li>\n
            • Rows_examined：\u626b\u63cf\u7684\u884c\u6570，\u8fd9\u4e2a\u503c\u5f88\u5927\u4ee3\u8868\u626b\u63cf\u5927\u91cf\u6570\u636e，\u662f\u4f18\u5316\u91cd\u70b9<\/li>\n
            • SET timestamp：SQL \u6267\u884c\u65f6\u95f4\u6233<\/li>\n

              \u91cd\u70b9\u770b：Query_time \u770b\u6162；Rows_examined\u770b\u626b\u63cf\u91cf，\u5f88\u591a SQL \u8017\u65f6\u4e0d\u957f，\u4f46\u626b\u63cf\u767e\u4e07\u884c，\u672a\u6765\u6570\u636e\u91cf\u4e0a\u6da8\u5c31\u4f1a\u53d8\u5361\u3002<\/p>\n

              4. \u5206\u6790\u5de5\u5177：mysqldumpslow<\/h3>\n

              MySQL \u81ea\u5e26\u5de5\u5177，\u89e3\u6790\u6162\u65e5\u5fd7，\u6c47\u603b\u7edf\u8ba1，\u4e0d\u7528\u8089\u773c\u770b\u5e9e\u5927\u65e5\u5fd7\u6587\u4ef6\u3002<\/p>\n

              \u5e38\u7528\u547d\u4ee4<\/h4>\n

              # \u67e5\u770b\u5e2e\u52a9
              \nmysqldumpslow –help<\/p>\n

              # \u6309\u7167\u67e5\u8be2\u65f6\u95f4\u6392\u5e8f，\u53d6\u524d10\u6761\u6162SQL
              \nmysqldumpslow -s t -t 10 \/var\/lib\/mysql\/mysql-slow.log<\/p>\n

              # \u6309\u7167\u626b\u63cf\u884c\u6570\u6392\u5e8f（\u770b\u626b\u63cf\u91cf\u5927\u7684SQL）
              \nmysqldumpslow -s r -t 10 mysql-slow.log<\/p>\n

              # \u5339\u914d\u5305\u542bselect\u7684\u8bed\u53e5
              \nmysqldumpslow -s t -g "select" mysql-slow.log<\/p>\n

              \u53c2\u6570\u8bf4\u660e：<\/p>\n

                \n
              • -s：\u6392\u5e8f\u65b9\u5f0f\n
                  \n
                • t：Query_time \u67e5\u8be2\u65f6\u95f4<\/li>\n
                • r：Rows_sent \u8fd4\u56de\u884c\u6570<\/li>\n
                • a：\u5e73\u5747\u67e5\u8be2\u65f6\u95f4<\/li>\n<\/ul>\n<\/li>\n
                • -t：top N，\u8f93\u51fa\u591a\u5c11\u6761<\/li>\n
                • -g：\u6b63\u5219\u8fc7\u6ee4 SQL<\/li>\n<\/ul>\n

                  mysqldumpslow \u4f1a\u628a\u503c\u66ff\u6362\u6210N\u3001S\u505a\u805a\u5408，\u76f8\u540c\u7ed3\u6784\u4e0d\u540c\u53c2\u6570\u7684 SQL \u5408\u5e76\u7edf\u8ba1，\u65b9\u4fbf\u770b\u9ad8\u9891\u6162 SQL\u3002<\/p>\n

                  \u7b2c\u4e09\u65b9\u5de5\u5177<\/h4>\n
                    \n
                  • pt-query-digest（percona toolkit）：\u5de5\u4e1a\u7ea7\u6162\u65e5\u5fd7\u5206\u6790，\u6bd4 mysqldumpslow \u5f3a\u5927，\u652f\u6301\u5206\u6790\u6587\u4ef6\u3001binlog\u3001general log，\u8f93\u51fa\u62a5\u544a\u5305\u542b\u5360\u6bd4\u3001\u6b21\u6570\u3001\u5e73\u5747\u8017\u65f6\u3002\u751f\u4ea7\u73af\u5883\u6700\u5e38\u7528\u3002<\/li>\n<\/ul>\n

                    5. \u751f\u4ea7\u6700\u4f73\u5b9e\u8df5<\/h3>\n
                  • \u9608\u503c\u8bbe\u7f6e：\u7ebf\u4e0a\u5efa\u8bae long_query_time=1（1 \u79d2），\u4e1a\u52a1\u654f\u611f\u53ef\u4ee5\u8c03\u5230 0.5 \u79d2；\u4e0d\u8981\u8bbe\u7f6e 0，\u4f1a\u8bb0\u5f55\u5168\u90e8 SQL，IO \u538b\u529b\u5de8\u5927\u3002<\/li>\n
                  • log_queries_not_using_indexes：\u751f\u4ea7\u73af\u5883\u4e0d\u5efa\u8bae\u5e38\u5f00，\u538b\u6d4b\u3001\u6392\u67e5\u9636\u6bb5\u4e34\u65f6\u6253\u5f00\u5373\u53ef\u3002<\/li>\n
                  • \u65e5\u5fd7\u6587\u4ef6\u8981\u505a\u8f6e\u8f6c\u5207\u5272，\u9632\u6b62\u65e5\u5fd7\u5360\u6ee1\u78c1\u76d8，\u914d\u5408 logrotate\u3002<\/li>\n
                  • \u6162\u67e5\u8be2\u65e5\u5fd7\u53ea\u505a\u53d1\u73b0\u95ee\u9898，\u62ff\u5230 SQL \u540e\u4e00\u5b9a\u8981\u7528 explain \u5206\u6790\u6267\u884c\u8ba1\u5212，\u5b9a\u4f4d\u7d22\u5f15\u3001\u5168\u8868\u626b\u63cf\u95ee\u9898\u3002<\/li>\n
                  • \u4e0d\u8981\u957f\u671f\u5f00\u542f\u8f93\u51fa\u5230 TABLE \u6a21\u5f0f，mysql.slow_log\u8868\u6570\u636e\u91cf\u5927\u4e5f\u4f1a\u5f71\u54cd\u6027\u80fd\u3002<\/li>\n

                    6. \u5e38\u89c1\u8bef\u533a<\/h3>\n
                  • \u274c：long_query_time=0 \u5168\u90e8\u8bb0\u5f55，\u7ebf\u4e0a\u7981\u6b62，IO \u5f00\u9500\u5f88\u9ad8\u3002<\/li>\n
                  • \u274c：\u53ea\u770b\u6267\u884c\u65f6\u95f4，\u5ffd\u7565Rows_examined；\u6709\u4e9b SQL \u5f88\u5feb，\u4f46\u626b\u63cf\u51e0\u5341\u4e07\u884c，\u6d41\u91cf\u4e0a\u6da8\u5c31\u4f1a\u96ea\u5d29\u3002<\/li>\n
                  • \u274c：\u6162\u65e5\u5fd7\u8bb0\u5f55 SQL \u4e0d\u4ee3\u8868 SQL \u4e00\u5b9a\u5199\u7684\u5dee，\u6709\u53ef\u80fd\u662f\u670d\u52a1\u5668\u538b\u529b\u5927\u3001\u9501\u51b2\u7a81\u3001IO \u6253\u6ee1\u5bfc\u81f4\u53d8\u6162\u3002<\/li>\n
                  • \u274c：\u4fee\u6539 global \u53d8\u91cf\u540e，\u5f53\u524d\u4f1a\u8bdd\u76f4\u63a5\u6d4b\u8bd5，\u9700\u8981\u91cd\u8fde\u4f1a\u8bdd\u65b0\u53c2\u6570\u624d\u751f\u6548\u3002<\/li>\n

                    7. \u548c show processlist\u3001performance_schema \u7684\u533a\u522b<\/h3>\n
                      \n
                    • \u6162\u67e5\u8be2\u65e5\u5fd7：\u4e8b\u540e\u8bb0\u5f55，\u5df2\u7ecf\u8dd1\u5b8c\u7684\u6162 SQL；<\/li>\n
                    • show processlist：\u5b9e\u65f6\u770b\u5f53\u524d\u6b63\u5728\u8fd0\u884c SQL；<\/li>\n
                    • performance_schema：\u53ef\u4ee5\u505a\u66f4\u7ec6\u7c92\u5ea6\u76d1\u63a7，\u4e0d\u9700\u8981\u6587\u4ef6\u65e5\u5fd7，\u9002\u5408\u7ebf\u4e0a\u6301\u7eed\u76d1\u63a7\u3002<\/li>\n<\/ul>\n

                      \u4e09\u3001\u62ff\u5230\u6162 SQL \u4e4b\u540e\u6807\u51c6\u6392\u67e5\u4f18\u5316\u6d41\u7a0b<\/h2>\n

                      \u6574\u4f53\u6b65\u9aa4<\/h3>\n
                    • \u6355\u83b7\u6162 SQL：\u6162\u67e5\u8be2\u65e5\u5fd7 \/performance_schema\/ APM，\u62ff\u5230\u5b8c\u6574 SQL \u6587\u672c<\/li>\n
                    • Explain \u770b\u6267\u884c\u8ba1\u5212，\u5b9a\u4f4d\u6839\u56e0<\/li>\n
                    • \u5206\u6790：\u7d22\u5f15？SQL \u5199\u6cd5？\u6570\u636e\u91cf？\u9501？\u4e8b\u52a1？<\/li>\n
                    • \u7ed9\u51fa\u4f18\u5316\u65b9\u6848，\u9a8c\u8bc1\u6539\u5199 SQL<\/li>\n
                    • \u4e0a\u7ebf，\u89c2\u5bdf\u6162\u65e5\u5fd7\u3001QPS\u3001CPU\u3001IO \u53d8\u5316<\/li>\n

                      1. Explain \u91cd\u70b9\u770b\u54ea\u4e9b\u5b57\u6bb5<\/h3>\n

                      explain select * from t where name='xxx';<\/p>\n

                        \n
                      • type：\u8bbf\u95ee\u7c7b\u578b，\u6027\u80fd\u4ece\u4f18\u5230\u52a3：system > const > eq_ref > ref > range > index > ALL\n
                          \n
                        • ALL：\u5168\u8868\u626b\u63cf，\u91cd\u70b9\u4f18\u5316<\/li>\n
                        • range：\u8303\u56f4\u626b\u63cf，\u8981\u770b\u626b\u63cf\u884c\u6570\u662f\u5426\u8fc7\u5927<\/li>\n<\/ul>\n<\/li>\n
                        • key：\u5b9e\u9645\u4f7f\u7528\u7684\u7d22\u5f15，NULL \u4ee3\u8868\u6ca1\u7528\u5230\u7d22\u5f15<\/li>\n
                        • rows：\u9884\u4f30\u626b\u63cf\u884c\u6570，\u6570\u503c\u8d8a\u5927\u8d8a\u5371\u9669<\/li>\n
                        • Extra：\u989d\u5916\u4fe1\u606f\n
                            \n
                          • Using filesort：\u6587\u4ef6\u6392\u5e8f，\u9700\u8981\u78c1\u76d8\u6392\u5e8f，\u6027\u80fd\u5dee，\u8981\u5efa\u7acb\u8054\u5408\u7d22\u5f15\u907f\u514d<\/li>\n
                          • Using temporary：\u4f7f\u7528\u4e34\u65f6\u8868，\u5e38\u89c1 group by \/distinct，\u5f00\u9500\u5927<\/li>\n
                          • Using index：\u8986\u76d6\u7d22\u5f15，\u5f88\u597d，\u4e0d\u9700\u8981\u56de\u8868<\/li>\n
                          • Using where：\u5b58\u50a8\u5f15\u64ce\u8fd4\u56de\u6570\u636e\u540e，MySQL \u670d\u52a1\u5c42\u518d\u8fc7\u6ee4<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                            \u26a0\ufe0f explain \u662f\u9884\u4f30，\u4e0d\u662f\u771f\u5b9e\u8fd0\u884c\u7ed3\u679c，\u4f18\u5316\u5668\u4f1a\u6839\u636e\u7edf\u8ba1\u4fe1\u606f\u9009\u62e9\u7d22\u5f15，\u7edf\u8ba1\u4fe1\u606f\u4e0d\u51c6\u4f1a\u5bfc\u81f4 explain \u7ed3\u679c\u548c\u771f\u5b9e\u6267\u884c\u4e0d\u4e00\u81f4\u3002<\/p>\n

                            2. \u5bf9\u5e94\u539f\u56e0<\/h3>\n

                            \u5b9e\u6218\u793a\u4f8b<\/p>\n

                            \u5efa\u8868：<\/p>\n

                            CREATE TABLE `user` (
                            \n `id` int NOT NULL AUTO_INCREMENT COMMENT '\u4e3b\u952e',
                            \n `name` varchar(32) DEFAULT NULL,
                            \n `age` int DEFAULT NULL,
                            \n `status` tinyint DEFAULT NULL,
                            \n `create_time` datetime DEFAULT NULL,
                            \n PRIMARY KEY (`id`),
                            \n KEY `idx_status_createtime` (`status`,`create_time`)
                            \n) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;<\/p>\n

                            \u793a\u4f8b 1：\u5168\u8868\u626b\u63cf type=ALL（\u6700\u574f）<\/h4>\n

                            explain select * from user where name='zhangsan';<\/p>\n\nidselect_typetabletypepossible_keyskeykey_lenrefrowsExtra<\/tr>\n\n\n
                            1<\/td>\nSIMPLE<\/td>\nuser<\/td>\nALL<\/td>\nNULL<\/td>\nNULL<\/td>\nNULL<\/td>\nNULL<\/td>\n10000<\/td>\nUsing where<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                            \u89e3\u8bfb：<\/p>\n

                              \n
                            • type=ALL：\u5168\u8868\u626b\u63cf<\/li>\n
                            • possible_keys=NULL：\u6ca1\u6709\u53ef\u9009\u7d22\u5f15<\/li>\n
                            • key=NULL：\u6ca1\u4f7f\u7528\u7d22\u5f15<\/li>\n
                            • rows=10000：\u9884\u4f30\u626b\u63cf 10000 \u884c<\/li>\n
                            • Extra:Using where：\u5f15\u64ce\u628a\u5168\u90e8\u6570\u636e\u8fd4\u56de\u7ed9 MySQL \u670d\u52a1\u5c42，\u5728\u670d\u52a1\u5c42\u505aname='zhangsan'\u8fc7\u6ee4\u3002<\/li>\n<\/ul>\n

                              \u95ee\u9898：\u6ca1\u6709\u7d22\u5f15，\u5168\u8868\u626b\u63cf，\u626b\u63cf\u5168\u90e8 10000 \u884c，\u5728 server \u5c42\u8fc7\u6ee4\u6570\u636e\u3002 \u89e3\u51b3\u65b9\u6cd5<\/p>\n

                              — \u7ed9\u67e5\u8be2\u6761\u4ef6\u5efa\u7acb\u7d22\u5f15
                              \ncreate index idx_name on user(name);<\/p>\n

                              \u6ce8\u610f：\u5b57\u6bb5\u533a\u5206\u5ea6\u5f88\u4f4e\u4e0d\u8981\u5efa\u7d22\u5f15（\u6bd4\u5982\u6027\u522b），\u7d22\u5f15\u6536\u76ca\u6781\u5c0f\u3002<\/p>\n

                              \u793a\u4f8b 2：range \u8303\u56f4\u626b\u63cf（\u98ce\u9669\u573a\u666f）<\/h4>\n

                              explain select * from user where id between 1 and 8000;<\/p>\n\nidselect_typetabletypepossible_keyskeykey_lenrefrowsExtra<\/tr>\n\n\n
                              1<\/td>\nSIMPLE<\/td>\nuser<\/td>\nrange<\/td>\nPRIMARY<\/td>\nPRIMARY<\/td>\n4<\/td>\nNULL<\/td>\n8000<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                              \u95ee\u9898：type \u867d\u7136\u662f range，\u4f46\u662f\u9884\u4f30\u626b\u63cf 8000 \u884c，\u626b\u63cf\u6570\u636e\u91cf\u5927，\u4f9d\u7136\u662f\u6162 SQL\u3002range \u4e0d\u7b49\u4e8e\u5feb\u3002 \u89e3\u51b3\u65b9\u6cd5<\/p>\n

                            • \u4e1a\u52a1\u5c42\u9762\u7f29\u5c0f\u67e5\u8be2\u8303\u56f4，\u4e0d\u8981\u4e00\u6b21\u6027\u67e5\u8fc7\u5927\u533a\u95f4；<\/li>\n
                            • \u5982\u679c\u4e0d\u9700\u8981\u5168\u90e8\u5b57\u6bb5，\u4f7f\u7528\u8986\u76d6\u7d22\u5f15\u51cf\u5c11\u56de\u8868；<\/li>\n
                            • \u5927\u6570\u636e\u91cf\u5206\u9875\u4f7f\u7528\u4e66\u7b7e\u5206\u9875 id>xxx limit …，\u907f\u514d\u5927\u8303\u56f4 between\u3002<\/li>\n

                              — \u4e66\u7b7e\u5206\u9875\u793a\u4f8b
                              \nselect id,name from user where id>100 limit 10;<\/p>\n

                              \u793a\u4f8b 3：Using filesort \u6587\u4ef6\u6392\u5e8f<\/h4>\n

                              \u5220\u9664 idx_status_createtime \u7d22\u5f15\u540e\u6267\u884c<\/p>\n

                              explain select * from user where status=1 order by create_time desc;<\/p>\n\nidselect_typetabletypepossible_keyskeykey_lenrefrowsExtra<\/tr>\n\n\n
                              1<\/td>\nSIMPLE<\/td>\nuser<\/td>\nALL<\/td>\nNULL<\/td>\nNULL<\/td>\nNULL<\/td>\nNULL<\/td>\n10000<\/td>\nUsing where; Using filesort<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                              \u95ee\u9898：\u67e5\u8be2\u51fa\u6ee1\u8db3 where \u7684\u6570\u636e\u4e4b\u540e，MySQL \u989d\u5916\u505a\u6392\u5e8f\u64cd\u4f5c，\u5185\u5b58\u4e0d\u591f\u5c31\u843d\u5230\u78c1\u76d8\u6587\u4ef6\u6392\u5e8f，\u6027\u80fd\u5dee\u3002<\/p>\n

                              \u89e3\u51b3\u65b9\u6cd5<\/p>\n

                              \u5efa\u7acb\u8054\u5408\u7d22\u5f15：where \u8fc7\u6ee4\u5b57\u6bb5\u653e\u524d\u9762，order by \u6392\u5e8f\u5b57\u6bb5\u7d27\u8ddf\u5176\u540e\u3002<\/p>\n

                              create index idx_status_createtime on user(status,create_time);<\/p>\n

                              \u5efa\u7acb\u7d22\u5f15\u540e，\u7d22\u5f15\u672c\u8eab\u5df2\u7ecf\u6709\u5e8f，\u4e0d\u9700\u8981 filesort\u3002<\/p>\n

                              \u6ce8\u610f：\u6392\u5e8f\u65b9\u5411\u8981\u4e00\u81f4，\u4e0d\u80fd\u4e00\u4e2a asc \u4e00\u4e2a desc，\u4f1a\u5931\u6548\u3002<\/p>\n

                              \n

                              \u793a\u4f8b 4：Using temporary \u4e34\u65f6\u8868<\/h4>\n

                              status \u65e0\u7d22\u5f15：<\/p>\n

                              explain select status,count(*) from user group by status;<\/p>\n

                              \u8868\u683c<\/p>\n\nidselect_typetabletypepossible_keyskeykey_lenrefrowsExtra<\/tr>\n\n\n
                              1<\/td>\nSIMPLE<\/td>\nuser<\/td>\nALL<\/td>\nNULL<\/td>\nNULL<\/td>\nNULL<\/td>\nNULL<\/td>\n10000<\/td>\nUsing temporary; Using filesort<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                              \u95ee\u9898：group by \/distinct \u9700\u8981\u521b\u5efa\u4e34\u65f6\u8868\u5b58\u50a8\u4e2d\u95f4\u5206\u7ec4\u7ed3\u679c，\u5f00\u9500\u9ad8\u3002 \u89e3\u51b3\u65b9\u6cd5<\/p>\n

                              — group by\u7684\u5b57\u6bb5\u5efa\u7acb\u7d22\u5f15
                              \ncreate index idx_status on user(status);<\/p>\n

                              \u7d22\u5f15\u6709\u5e8f，\u53ef\u4ee5\u76f4\u63a5\u5206\u7ec4，\u4e0d\u9700\u8981\u4e34\u65f6\u8868\u3002<\/p>\n

                              \u5982\u679c\u4e1a\u52a1\u65e0\u6cd5\u5efa\u7d22\u5f15：\u51cf\u5c11 group by \u5206\u7ec4\u57fa\u6570，\u4e1a\u52a1\u5185\u5b58\u505a\u805a\u5408，\u4e0d\u8981\u6570\u636e\u5e93\u5927\u8868\u5206\u7ec4\u3002<\/p>\n

                              \u793a\u4f8b 5：Using index \u2705\u8986\u76d6\u7d22\u5f15（\u4f18\u79c0）<\/h4>\n

                              explain select status,create_time from user where status=1;<\/p>\n\nidselect_typetabletypepossible_keyskeykey_lenrefrowsExtra<\/tr>\n\n\n
                              1<\/td>\nSIMPLE<\/td>\nuser<\/td>\nref<\/td>\nidx_status_createtime<\/td>\nidx_status_createtime<\/td>\n2<\/td>\nconst<\/td>\n500<\/td>\nUsing index<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                              \u8bf4\u660e：\u67e5\u8be2\u5b57\u6bb5\u5168\u90e8\u5305\u542b\u5728\u7d22\u5f15\u4e2d，\u4e0d\u9700\u8981\u56de\u8868\u67e5\u8be2\u4e3b\u952e\u6570\u636e，\u6027\u80fd\u5f88\u9ad8\u3002<\/p>\n

                              \u5982\u4f55\u5b9e\u73b0\u8986\u76d6\u7d22\u5f15 select \u540e\u9762\u67e5\u8be2\u7684\u5217，\u5168\u90e8\u653e\u5230\u8054\u5408\u7d22\u5f15\u91cc\u3002<\/p>\n

                              — \u67e5\u8be2 status,create_time，\u7d22\u5f15\u5305\u542b\u8fd9\u4e24\u4e2a\u5b57\u6bb5
                              \nKEY `idx_status_createtime` (`status`,`create_time`)<\/p>\n

                              \u274c\u4e0d\u8981 select *，\u4f1a\u7834\u574f\u8986\u76d6\u7d22\u5f15，\u89e6\u53d1\u56de\u8868\u3002<\/p>\n

                              \u793a\u4f8b 6：possible_keys \u6709\u7d22\u5f15，key \u4e3a NULL（\u6709\u7d22\u5f15\u4f46\u662f\u4e0d\u8d70）<\/h4>\n

                              \u573a\u666f：\u7d22\u5f15\u533a\u5206\u5ea6\u5dee\u3002status \u53ea\u6709 0 \u548c 1 \u4e24\u4e2a\u503c\u3002<\/p>\n

                              explain select * from user where status=1;<\/p>\n

                              possible_keys \u663e\u793aidx_status，key=null，type=ALL\u3002<\/p>\n

                              \u95ee\u9898：\u4f18\u5316\u5668\u5224\u65ad\u8d70\u7d22\u5f15\u56de\u8868\u4ee3\u4ef7\u9ad8\u4e8e\u5168\u8868\u626b\u63cf，\u653e\u5f03\u7d22\u5f15\u76f4\u63a5\u5168\u8868\u626b\u63cf\u3002 \u89e3\u51b3\u65b9\u6cd5<\/p>\n

                            • \u4f4e\u533a\u5206\u5ea6\u5b57\u6bb5\u4e0d\u9002\u5408\u5355\u72ec\u5efa\u7d22\u5f15；<\/li>\n
                            • \u8c03\u6574\u4e1a\u52a1，\u589e\u52a0\u8fc7\u6ee4\u6761\u4ef6；<\/li>\n
                            • \u53ef\u4ee5\u5f3a\u5236\u7d22\u5f15（\u4ec5\u4e34\u65f6\u9a8c\u8bc1，\u751f\u4ea7\u614e\u7528）<\/li>\n

                              select * from user force index(idx_status) where status=1;<\/p>\n

                              \u793a\u4f8b 7：\u7d22\u5f15\u5931\u6548（\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362）<\/h4>\n

                              name \u662f varchar \u5b57\u7b26\u4e32\u5b57\u6bb5，\u67e5\u8be2\u4f20\u5165\u6570\u5b57<\/p>\n

                              explain select * from user where name=1234;<\/p>\n

                              \u5373\u4f7f\u6709idx_name\u7d22\u5f15，key \u4f9d\u65e7\u4e3a NULL，type=ALL\u3002 \u539f\u56e0：\u5b57\u6bb5\u53d1\u751f\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362，\u7d22\u5f15\u5931\u6548\u3002 \u89e3\u51b3\u65b9\u6cd5：\u4fdd\u6301\u7c7b\u578b\u4e00\u81f4<\/p>\n

                              select * from user where name='1234';<\/p>\n

                              \u793a\u4f8b 8：type=index（\u626b\u63cf\u6574\u4e2a\u7d22\u5f15\u6811）<\/h4>\n

                              explain select name from user;<\/p>\n

                              type=index，Extra \u4e3a\u7a7a\u3002<\/p>\n

                              type=index：\u904d\u5386\u6574\u4e2a\u4e8c\u7ea7\u7d22\u5f15\u6811，\u4e0d\u662f\u5168\u8868，\u4f46\u626b\u63cf\u5927\u91cf\u7d22\u5f15\u9875，\u6027\u80fd\u5dee；\u4e0d\u8981\u548cUsing index\u6df7\u6dc6\u3002 \u89e3\u51b3\u65b9\u6cd5：\u4e1a\u52a1\u52a0 where \u6761\u4ef6，\u4e0d\u8981\u4e0d\u52a0\u6761\u4ef6\u67e5\u8be2\u5927\u91cf\u6570\u636e\u3002<\/p>\n

                              Extra \u5b57\u6bb5\u901f\u67e5\u8868<\/h3>\n

                              \u8868\u683c<\/p>\n\nExtra\u73b0\u8c61\u5904\u7406\u65b9\u6848<\/tr>\n\n\n\n\n\n
                              Using where<\/td>\n\u5b58\u50a8\u5f15\u64ce\u8fd4\u56de\u6570\u636e，\u670d\u52a1\u5c42\u8fc7\u6ee4<\/td>\n\u642d\u914d type=ALL \u624d\u9700\u8981\u4f18\u5316<\/td>\n<\/tr>\n
                              Using filesort<\/td>\n\u6587\u4ef6\u6392\u5e8f<\/td>\n\u5efa\u7acb\u8054\u5408\u7d22\u5f15，where \u6761\u4ef6 + order by \u5b57\u6bb5<\/td>\n<\/tr>\n
                              Using temporary<\/td>\n\u4e34\u65f6\u8868<\/td>\ngroup by\/distinct \u5b57\u6bb5\u5efa\u7d22\u5f15<\/td>\n<\/tr>\n
                              Using index<\/td>\n\u8986\u76d6\u7d22\u5f15<\/td>\n\u2705\u4f18\u79c0，\u5c3d\u91cf\u505a\u5230<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                              <\/h3>\n

                              3. \u533a\u5206：\u662f SQL \u672c\u8eab\u6162，\u8fd8\u662f\u9501\u7b49\u5f85\u6162<\/h3>\n

                              \u770b\u6162\u65e5\u5fd7\u91cc Lock_time：<\/p>\n

                                \n
                              • Lock_time \u5927，Query_time \u4e0d\u5927：SQL \u672c\u8eab\u5f88\u5feb，\u5927\u91cf\u65f6\u95f4\u5728\u7b49\u9501，\u5c5e\u4e8e\u9501\u51b2\u7a81\u95ee\u9898，\u4e0d\u662f SQL \u7d22\u5f15\u95ee\u9898\u3002 \u6392\u67e5\u65b9\u5411：\u5927\u4e8b\u52a1\u3001\u957f\u4e8b\u52a1，\u884c\u9501\u51b2\u7a81\u3002<\/li>\n
                              • Lock_time \u5f88\u5c0f，Query_time \u5f88\u5927：SQL \u6267\u884c\u672c\u8eab\u6162，\u4f18\u5148\u4f18\u5316\u7d22\u5f15\u548c SQL \u5199\u6cd5\u3002<\/li>\n<\/ul>\n

                                4. \u4f18\u5316\u540e\u9a8c\u8bc1<\/h3>\n
                              • explain \u786e\u8ba4\u6267\u884c\u8ba1\u5212\u6539\u5584<\/li>\n
                              • \u7ebf\u4e0a\u7070\u5ea6\u89c2\u5bdf：\u6162\u65e5\u5fd7\u4e0d\u518d\u51fa\u73b0\u8fd9\u6761 SQL，\u6570\u636e\u5e93 CPU\u3001IO \u4e0b\u964d，\u54cd\u5e94\u65f6\u95f4\u4e0b\u964d<\/li>\n
                              • \u5173\u6ce8\u8fb9\u754c：\u6570\u636e\u589e\u957f\u540e\u4f1a\u4e0d\u4f1a\u518d\u6b21\u6076\u5316<\/li>\n

                                <\/h3>\n

                                \u603b\u7ed3<\/h2>\n

                                \u62ff\u5230 explain \u6267\u884c\u8ba1\u5212：<\/p>\n

                              • \u770btype，\u4f18\u5148\u4fdd\u8bc1\u81f3\u5c11\u8fbe\u5230 range\/ref \u7ea7\u522b，\u907f\u514d ALL；<\/li>\n
                              • \u770bkey\u786e\u8ba4\u662f\u5426\u771f\u6b63\u4f7f\u7528\u7d22\u5f15，possible_keys \u6709\u7d22\u5f15\u4e0d\u7b49\u4e8e\u5b9e\u9645\u4f7f\u7528；<\/li>\n
                              • \u770brows\u9884\u4f30\u626b\u63cf\u884c\u6570，\u884c\u6570\u8fc7\u5927\u5373\u4f7f type \u4e0d\u9519\u4e5f\u662f\u98ce\u9669 SQL；<\/li>\n
                              • \u770b Extra，\u51fa\u73b0Using filesort\u3001Using temporary\u9700\u8981\u4f18\u5316；<\/li>\n
                              • \u5224\u65ad\u662f\u7f3a\u5c11\u7d22\u5f15\u3001\u7d22\u5f15\u5931\u6548\u3001\u4f18\u5316\u5668\u653e\u5f03\u7d22\u5f15；\u9488\u5bf9\u6027\u5efa\u7d22\u5f15\u3001\u6539\u5199 SQL；<\/li>\n
                              • \u4f18\u5316\u5b8c\u518d\u6b21 explain \u9a8c\u8bc1\u3002<\/li>\n

                                \u6ce8\u610f：rows \u662f\u9884\u4f30\u503c，MySQL \u7edf\u8ba1\u4fe1\u606f\u4e0d\u51c6，explain \u7ed3\u679c\u4e0d\u7b49\u4e8e\u771f\u5b9e\u6267\u884c\u60c5\u51b5\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

                                \u6982\u5ff5\u6162\u67e5\u8be2\u65e5\u5fd7（slow query log）\u662f MySQL \u8bb0\u5f55\u6267\u884c\u65f6\u95f4\u8d85\u8fc7\u6307\u5b9a\u9608\u503cSQL \u7684\u65e5\u5fd7，\u7528\u6765\u5b9a\u4f4d\u6162 SQL\u3001\u6027\u80fd\u74f6\u9888，\u662f SQL \u4f18\u5316\u6700\u57fa\u7840\u7684\u5de5\u5177\u3002\u4e00\u3001\u6162 SQL\u6162 SQL \u4e0d\u662f\u8bed\u6cd5\u9519\u8bef\u7684 SQL，\u662f\u6267\u884c\u6548\u7387\u4f4e\u4e0b，\u6d88\u8017\u5927\u91cf\u6570\u636e\u5e93\u8d44\u6e90（CPU\u3001IO\u3001\u9501），\u6267\u884c\u8017\u65f6\u8f83\u957f\u7684 SQL \u8bed\u53e5\u3002 \u7b80\u5355\u8bf4：\u8dd1\u7684\u6162\u3001\u8017\u8d44\u6e90，\u62d6<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[10187,6404,10955,114,3061,100],"topic":[],"class_list":["post-97702","post","type-post","status-publish","format-standard","hentry","category-server","tag-codingplan","tag-sql","tag-10955","tag-mysql","tag-100"],"yoast_head":"\n\u8be6\u89e3MySQL \u6162\u67e5\u8be2\u65e5\u5fd7( \u9644\u8be6\u7ec6\u6848\u4f8b ) - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/97702.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u8be6\u89e3MySQL \u6162\u67e5\u8be2\u65e5\u5fd7( \u9644\u8be6\u7ec6\u6848\u4f8b ) - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u6982\u5ff5\u6162\u67e5\u8be2\u65e5\u5fd7（slow query log）\u662f MySQL \u8bb0\u5f55\u6267\u884c\u65f6\u95f4\u8d85\u8fc7\u6307\u5b9a\u9608\u503cSQL \u7684\u65e5\u5fd7，\u7528\u6765\u5b9a\u4f4d\u6162 SQL\u3001\u6027\u80fd\u74f6\u9888，\u662f SQL \u4f18\u5316\u6700\u57fa\u7840\u7684\u5de5\u5177\u3002\u4e00\u3001\u6162 SQL\u6162 SQL \u4e0d\u662f\u8bed\u6cd5\u9519\u8bef\u7684 SQL，\u662f\u6267\u884c\u6548\u7387\u4f4e\u4e0b，\u6d88\u8017\u5927\u91cf\u6570\u636e\u5e93\u8d44\u6e90（CPU\u3001IO\u3001\u9501），\u6267\u884c\u8017\u65f6\u8f83\u957f\u7684 SQL \u8bed\u53e5\u3002 \u7b80\u5355\u8bf4：\u8dd1\u7684\u6162\u3001\u8017\u8d44\u6e90，\u62d6\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/97702.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-29T18:00:37+00:00\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/97702.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/97702.html\",\"name\":\"\u8be6\u89e3MySQL \u6162\u67e5\u8be2\u65e5\u5fd7( \u9644\u8be6\u7ec6\u6848\u4f8b ) - 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\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.wsisp.com\/helps\/97702.html","og_locale":"zh_CN","og_type":"article","og_title":"\u8be6\u89e3MySQL \u6162\u67e5\u8be2\u65e5\u5fd7( \u9644\u8be6\u7ec6\u6848\u4f8b ) - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","og_description":"\u6982\u5ff5\u6162\u67e5\u8be2\u65e5\u5fd7（slow query log）\u662f MySQL \u8bb0\u5f55\u6267\u884c\u65f6\u95f4\u8d85\u8fc7\u6307\u5b9a\u9608\u503cSQL \u7684\u65e5\u5fd7，\u7528\u6765\u5b9a\u4f4d\u6162 SQL\u3001\u6027\u80fd\u74f6\u9888，\u662f SQL \u4f18\u5316\u6700\u57fa\u7840\u7684\u5de5\u5177\u3002\u4e00\u3001\u6162 SQL\u6162 SQL \u4e0d\u662f\u8bed\u6cd5\u9519\u8bef\u7684 SQL，\u662f\u6267\u884c\u6548\u7387\u4f4e\u4e0b，\u6d88\u8017\u5927\u91cf\u6570\u636e\u5e93\u8d44\u6e90（CPU\u3001IO\u3001\u9501），\u6267\u884c\u8017\u65f6\u8f83\u957f\u7684 SQL \u8bed\u53e5\u3002 \u7b80\u5355\u8bf4：\u8dd1\u7684\u6162\u3001\u8017\u8d44\u6e90，\u62d6","og_url":"https:\/\/www.wsisp.com\/helps\/97702.html","og_site_name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","article_published_time":"2026-08-29T18:00:37+00:00","author":"admin","twitter_card":"summary_large_image","twitter_misc":{"\u4f5c\u8005":"admin","\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4":"7 \u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.wsisp.com\/helps\/97702.html","url":"https:\/\/www.wsisp.com\/helps\/97702.html","name":"\u8be6\u89e3MySQL \u6162\u67e5\u8be2\u65e5\u5fd7( \u9644\u8be6\u7ec6\u6848\u4f8b ) - 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