{"id":10006184,"date":"2022-08-12T11:10:31","date_gmt":"2022-08-12T03:10:31","guid":{"rendered":"https:\/\/ityet.com\/?p=10006184"},"modified":"2022-08-12T11:10:31","modified_gmt":"2022-08-12T03:10:31","slug":"mysql%e6%9c%80%e6%9c%b4%e7%b4%a0%e7%9a%84%e7%9b%91%e6%8e%a7%e6%96%b9%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10006184","title":{"rendered":"MYSQL\u6700\u6734\u7d20\u7684\u76d1\u63a7\u65b9\u5f0f"},"content":{"rendered":"

\u5bf9\u4e8e\u5f53\u524d\u6570\u636e\u5e93\u7684\u76d1\u63a7\u65b9\u5f0f\u6709\u5f88\u591a\uff0c\u5206\u4e3a\u6570\u636e\u5e93\u81ea\u5e26\u3001\u5546\u7528\u3001\u5f00\u6e90\u4e09\u5927\u7c7b\uff0c\u6bcf\u4e00\u79cd\u90fd\u6709\u5404\u81ea\u7684\u7279\u8272\uff1b\u800c\u5bf9\u4e8emysql\u6570\u636e\u5e93\u7531\u4e8e\u5176\u6709\u5f88\u9ad8\u7684\u793e\u533a\u6d3b\u8dc3\u5ea6\uff0c\u76d1\u63a7\u65b9\u5f0f\u66f4\u662f\u591a\u79cd\u591a\u6837\uff0c\u4e0d\u7ba1\u54ea\u79cd\u76d1\u63a7\u65b9\u5f0f\u6700\u6838\u5fc3\u7684\u5c31\u662f\u76d1\u63a7\u6570\u636e\uff0c\u83b7\u53d6\u5f97\u5230\u5168\u9762\u7684\u76d1\u63a7\u6570\u636e\u540e\u5c31\u662f\u7075\u6d3b\u7684\u5c55\u793a\u90e8\u5206\u3002\u90a3\u6211\u4eec\u4eca\u5929\u5c31\u4ecb\u7ecd\u4e00\u4e0b\u5b8c\u5168\u91c7\u7528mysql\u81ea\u6709\u65b9\u5f0f\u91c7\u96c6\u83b7\u53d6\u76d1\u63a7\u6570\u636e\uff0c\u5728\u5355\u4f53\u4e0b\u8fbe\u5230\u6700\u5feb\u901f\u3001\u65b9\u4fbf\u3001\u635f\u8017\u6700\u5c0f\u3002<\/p>\n

\u672c\u6b21\u6587\u7ae0\u5b8c\u5168\u4f7f\u7528mysql\u81ea\u5e26\u7684show\u547d\u4ee4\u5b9e\u73b0\u83b7\u53d6\uff0c\u4ececonnects\u3001buffercache\u3001lock\u3001SQL\u3001statement\u3001Database throughputs\u3001serverconfig7\u5927\u65b9\u9762\u5168\u9762\u83b7\u53d6\u76d1\u63a7\u6570\u636e\u3002<\/p>\n

1 \u8fde\u63a5\u6570\uff08Connects\uff09<\/p>\n

\u6700\u5927\u4f7f\u7528\u8fde\u63a5\u6570\uff1ashow status like \u2018Max_used_connections\u2019
\u5f53\u524d\u6253\u5f00\u7684\u8fde\u63a5\u6570\uff1ashow status like \u2018Threads_connected\u2019<\/p>\n

2 \u7f13\u5b58\uff08bufferCache\uff09<\/p>\n

\u672a\u4ece\u7f13\u51b2\u6c60\u8bfb\u53d6\u7684\u6b21\u6570\uff1ashow status like \u2018Innodb_buffer_pool_reads\u2019
\u4ece\u7f13\u51b2\u6c60\u8bfb\u53d6\u7684\u6b21\u6570\uff1ashow status like \u2018Innodb_buffer_pool_read_requests\u2019
\u7f13\u51b2\u6c60\u7684\u603b\u9875\u6570\uff1ashow status like \u2018Innodb_buffer_pool_pages_total\u2019
\u7f13\u51b2\u6c60\u7a7a\u95f2\u7684\u9875\u6570\uff1ashow status like \u2018Innodb_buffer_pool_pages_free\u2019
\u7f13\u5b58\u547d\u4e2d\u7387\u8ba1\u7b97\uff1a\uff081-Innodb_buffer_pool_reads\/Innodb_buffer_pool_read_requests\uff09*100%
\u7f13\u5b58\u6c60\u4f7f\u7528\u7387\u4e3a\uff1a((Innodb_buffer_pool_pages_total-Innodb_buffer_pool_pages_free\uff09\/Innodb_buffer_pool_pages_total\uff09*100%<\/p>\n

3 \u9501\uff08lock\uff09<\/p>\n

\u9501\u7b49\u5f85\u4e2a\u6570\uff1ashow status like \u2018Innodb_row_lock_waits\u2019
\u5e73\u5747\u6bcf\u6b21\u9501\u7b49\u5f85\u65f6\u95f4\uff1ashow status like \u2018Innodb_row_lock_time_avg\u2019
\u67e5\u770b\u662f\u5426\u5b58\u5728\u8868\u9501\uff1ashow open TABLES where in_use>0\uff1b\u6709\u6570\u636e\u4ee3\u8868\u5b58\u5728\u9501\u8868\uff0c\u7a7a\u4e3a\u65e0\u8868\u9501
\u5907\u6ce8\uff1a\u9501\u7b49\u5f85\u7edf\u8ba1\u5f97\u6570\u91cf\u4e3a\u7d2f\u52a0\u6570\u636e\uff0c\u6bcf\u6b21\u83b7\u53d6\u5f97\u65f6\u5019\u53ef\u4ee5\u8ddf\u4e4b\u524d\u5f97\u6570\u636e\u8fdb\u884c\u76f8\u51cf\uff0c\u5f97\u5230\u5f53\u524d\u7edf\u8ba1\u5f97\u6570\u636e<\/p>\n

4 SQL
\u67e5\u770bmysql\u5f00\u5173\u662f\u5426\u6253\u5f00\uff1ashow variables like \u2018slow_query_log\u2019\uff0cON\u4e3a\u5f00\u542f\u72b6\u6001\uff0c\u5982\u679c\u4e3aOFF\uff0cset global slow_query_log=1 \u8fdb\u884c\u5f00\u542f
\u67e5\u770bmysql\u9608\u503c\uff1ashow variables like \u2018long_query_time\u2019\uff0c\u6839\u636e\u9875\u9762\u4f20\u9012\u9608\u503c\u53c2\u6570\uff0c\u4fee\u6539\u9608\u503c set global long_query_time=0.1
\u67e5\u770bmysql\u6162sql\u76ee\u5f55\uff1ashow variables like \u2018slow_query_log_file\u2019
\u683c\u5f0f\u5316\u6162sql\u65e5\u5fd7\uff1amysqldumpslow -s at -t 10 \/export\/data\/mysql\/log\/slow.log\u6ce8\uff1a\u6b64\u8bed\u53e5\u901a\u8fc7jdbc\u6267\u884c\u4e0d\u4e86\uff0c\u5c5e\u4e8e\u547d\u4ee4\u884c\u6267\u884c\u3002\u610f\u601d\u4e3a\uff1a\u663e\u793a\u51fa\u8017\u65f6\u6700\u957f\u768410\u4e2aSQL\u8bed\u53e5\u6267\u884c\u4fe1\u606f\uff0c10\u53ef\u4ee5\u4fee\u6539\u4e3aTOP\u4e2a\u6570\u3002\u663e\u793a\u7684\u4fe1\u606f\u4e3a\uff1a\u6267\u884c\u6b21\u6570\u3001\u5e73\u5747\u6267\u884c\u65f6\u95f4\u3001SQL\u8bed\u53e5
\u5907\u6ce8\uff1a\u5f53mysqldumpslow\u547d\u4ee4\u6267\u884c\u5931\u8d25\u65f6\uff0c\u5c06\u6162\u65e5\u5fd7\u540c\u6b65\u5230\u672c\u5730\u8fdb\u884c\u683c\u5f0f\u5316\u5904\u7406\u3002<\/p>\n

5 statement
insert\u6570\u91cf\uff1ashow status like \u2018Com_insert\u2019
delete\u6570\u91cf\uff1ashow status like \u2018Com_delete\u2019
update\u6570\u91cf\uff1ashow status like \u2018Com_update\u2019
select\u6570\u91cf\uff1ashow status like \u2018Com_select\u2019<\/p>\n

6 \u541e\u5410\uff08Database throughputs\uff09
\u53d1\u9001\u541e\u5410\u91cf\uff1ashow status like \u2018Bytes_sent\u2019
\u63a5\u6536\u541e\u5410\u91cf\uff1ashow status like \u2018Bytes_received\u2019
\u603b\u541e\u5410\u91cf\uff1aBytes_sent+Bytes_received<\/p>\n

7 \u6570\u636e\u5e93\u53c2\u6570\uff08serverconfig\uff09
show variables
\"\u56fe\u7247\"<\/p>\n

8 \u6162SQL
\u6162SQL\u6307\u7684\u662fMySQL\u6162\u67e5\u8be2\uff0c\u5177\u4f53\u6307\u8fd0\u884c\u65f6\u95f4\u8d85\u8fc7long_query_time\u503c\u7684SQL\u3002
\u6211\u4eec\u5e38\u542cMySQL\u4e2d\u6709\u4e8c\u8fdb\u5236\u65e5\u5fd7binlog\u3001\u4e2d\u7ee7\u65e5\u5fd7relaylog\u3001\u91cd\u505a\u56de\u6eda\u65e5\u5fd7redolog\u3001undolog\u7b49\u3002\u9488\u5bf9\u6162\u67e5\u8be2\uff0c\u8fd8\u6709\u4e00\u79cd\u6162\u67e5\u8be2\u65e5\u5fd7slowlog\uff0c\u7528\u6765\u8bb0\u5f55\u5728MySQL\u4e2d\u54cd\u5e94\u65f6\u95f4\u8d85\u8fc7\u9600\u503c\u7684\u8bed\u53e5\u3002\u6162SQL\u5bf9\u5b9e\u9645\u751f\u4ea7\u4e1a\u52a1\u5f71\u54cd\u662f\u81f4\u547d\u7684\uff0c\u6240\u4ee5\u6d4b\u8bd5\u4eba\u5458\u5728\u6027\u80fd\u6d4b\u8bd5\u8fc7\u7a0b\u4e2d\uff0c\u5bf9\u6570\u636e\u5e93SQL\u8bed\u53e5\u6267\u884c\u60c5\u51b5\u5b9e\u65bd\u76d1\u63a7\uff0c\u7ed9\u5f00\u53d1\u63d0\u4f9b\u51c6\u786e\u7684\u6027\u80fd\u4f18\u5316\u610f\u89c1\u663e\u5f97\u5c24\u4e3a\u91cd\u8981\u3002\u90a3\u600e\u4e48\u4f7f\u7528Mysql\u6570\u636e\u5e93\u63d0\u4f9b\u7684\u6162\u67e5\u8be2\u65e5\u5fd7\u6765\u76d1\u63a7SQL\u8bed\u53e5\u6267\u884c\u60c5\u51b5\uff0c\u627e\u5230\u6d88\u8017\u8f83\u9ad8\u7684SQL\u8bed\u53e5\uff0c\u4ee5\u4e0b\u8be6\u7ec6\u8bf4\u660e\u4e00\u4e0b\u6162\u67e5\u8be2\u65e5\u5fd7\u7684\u4f7f\u7528\u6b65\u9aa4\uff1a
\u786e\u4fdd\u6253\u5f00\u6162SQL\u5f00\u5173slow_query_log
\"\u56fe\u7247\"<\/p>\n

\u8bbe\u7f6e\u6162SQL\u57df\u503clong_query_time
\u8fd9\u4e2along_query_time\u662f\u7528\u6765\u5b9a\u4e49\u6162\u4e8e\u591a\u5c11\u79d2\u7684\u624d\u7b97\u201c\u6162\u67e5\u8be2\u201d\uff0c\u6ce8\u610f\u5355\u4f4d\u662f\u79d2\uff0c\u6211\u901a\u8fc7\u6267\u884csql\u6307\u4ee4set long_query_time=1\u6765\u8bbe\u7f6e\u4e86long_query_time\u7684\u503c\u4e3a1, \u4e5f\u5c31\u662f\u6267\u884c\u65f6\u95f4\u8d85\u8fc71\u79d2\u7684\u90fd\u7b97\u6162\u67e5\u8be2\uff0c\u5982\u4e0b\uff1a<\/p>\n

\"\u56fe\u7247\"<\/p>\n

\u67e5\u770b\u6162SQL\u65e5\u5fd7\u8def\u5f84<\/p>\n

\"\u56fe\u7247\"<\/p>\n

\u901a\u8fc7\u6162sql\u5206\u6790\u5de5\u5177mysqldumpslow\u683c\u5f0f\u5316\u5206\u6790\u6162SQL\u65e5\u5fd7
mysqldumpslow\u6162\u67e5\u8be2\u5206\u6790\u5de5\u5177\uff0c\u662fmysql\u5b89\u88c5\u540e\u81ea\u5e26\u7684\uff0c\u53ef\u4ee5\u901a\u8fc7.\/mysqldumpslow \u2014help\u67e5\u770b\u4f7f\u7528\u53c2\u6570\u8bf4\u660e<\/p>\n

\"\u56fe\u7247\"<\/p>\n

\u5e38\u89c1\u7528\u6cd5\uff1a
\u53d6\u51fa\u4f7f\u7528\u6700\u591a\u768410\u6761\u6162\u67e5\u8be2.\/mysqldumpslow -s c -t 10 \/export\/data\/mysql\/log\/slow.log
\u53d6\u51fa\u67e5\u8be2\u65f6\u95f4\u6700\u6162\u76843\u6761\u6162\u67e5\u8be2.\/mysqldumpslow -s t -t 3 \/export\/data\/mysql\/log\/slow.log<\/p>\n

\u6ce8\u610f: \u4f7f\u7528mysqldumpslow\u7684\u5206\u6790\u7ed3\u679c\u4e0d\u4f1a\u663e\u793a\u5177\u4f53\u5b8c\u6574\u7684sql\u8bed\u53e5,\u53ea\u4f1a\u663e\u793asql\u7684\u7ec4\u6210\u7ed3\u6784;<\/p>\n

\u5047\u5982: SELECT\u00a0FROM sms_send WHERE service_id=10 GROUP BY content LIMIT 0, 1000;<\/p>\n

mysqldumpslow\u547d\u4ee4\u6267\u884c\u540e\u663e\u793a\uff1aCount: 2 Time=1.5s (3s) Lock=0.00s (0s) Rows=1000.0 (2000),
vgos_dba[vgos_dba]@[10.130.229.196]SELECT\u00a0FROM sms_send WHERE service_id=N GROUP BY content LIMIT N, N<\/p>\n

mysqldumpslow\u7684\u5206\u6790\u7ed3\u679c\u8be6\u89e3\uff1a
Count\uff1a\u8868\u793a\u8be5\u7c7b\u578b\u7684\u8bed\u53e5\u6267\u884c\u6b21\u6570\uff0c\u4e0a\u56fe\u4e2d\u8868\u793aselect\u8bed\u53e5\u6267\u884c\u4e862\u6b21\u3002
Time\uff1a\u8868\u793a\u8be5\u7c7b\u578b\u7684\u8bed\u53e5\u6267\u884c\u7684\u5e73\u5747\u65f6\u95f4\uff08\u603b\u8ba1\u65f6\u95f4\uff09
Lock\uff1a\u9501\u65f6\u95f40s\u3002
Rows\uff1a\u5355\u6b21\u8fd4\u56de\u7684\u7ed3\u679c\u6570\u662f1000\u6761\u8bb0\u5f55\uff0c2\u6b21\u603b\u5171\u8fd4\u56de2000\u6761\u8bb0\u5f55\u3002
\u901a\u8fc7\u8fd9\u4e2a\u5de5\u5177\u5c31\u53ef\u4ee5\u67e5\u8be2\u51fa\u6765\u54ea\u4e9bsql\u8bed\u53e5\u662f\u6162SQL\uff0c\u4ece\u800c\u53cd\u9988\u7814\u53d1\u8fdb\u884c\u4f18\u5316\uff0c\u6bd4\u5982\u52a0\u7d22\u5f15\uff0c\u8be5\u5e94\u7528\u7684\u5b9e\u73b0\u65b9\u5f0f\u7b49\u3002<\/p>\n

\u5e38\u89c1\u6162SQL\u6392\u67e5<\/p>\n

    \n
  1. \u4e0d\u4f7f\u7528\u5b50\u67e5\u8be2
    SELECT\u00a0FROM t1 WHERE id (SELECT id FROM t2 WHERE name=\u2019hechunyang\u2019);
    \u5b50\u67e5\u8be2\u5728MySQL5.5\u7248\u672c\u91cc\uff0c\u5185\u90e8\u6267\u884c\u8ba1\u5212\u5668\u662f\u8fd9\u6837\u6267\u884c\u7684\uff1a\u5148\u67e5\u5916\u8868\u518d\u5339\u914d\u5185\u8868\uff0c\u800c\u4e0d\u662f\u5148\u67e5\u5185\u8868t2\uff0c\u5f53\u5916\u8868\u7684\u6570\u636e\u5f88\u5927\u65f6\uff0c\u67e5\u8be2\u901f\u5ea6\u4f1a\u975e\u5e38\u6162\u3002
    \u5728MariaDB10\/MySQL5.6\u7248\u672c\u91cc\uff0c\u91c7\u7528join\u5173\u8054\u65b9\u5f0f\u5bf9\u5176\u8fdb\u884c\u4e86\u4f18\u5316\uff0c\u8fd9\u6761SQL\u4f1a\u81ea\u52a8\u8f6c\u6362\u4e3a SELECT t1.\u00a0FROM t1 JOIN t2 ON t1.id = t2.id;
    \u4f46\u8bf7\u6ce8\u610f\u7684\u662f\uff1a\u4f18\u5316\u53ea\u9488\u5bf9SELECT\u6709\u6548\uff0c\u5bf9UPDATE\/DELETE\u5b50 \u67e5\u8be2\u65e0\u6548\uff0c \u751f\u4ea7\u73af\u5883\u5c3d\u91cf\u5e94\u907f\u514d\u4f7f\u7528\u5b50\u67e5\u8be2\u3002<\/li>\n
  2. \u907f\u514d\u51fd\u6570\u7d22\u5f15
    SELECT\u00a0FROM t WHERE YEAR(d) >= 2016;
    \u7531\u4e8eMySQL\u4e0d\u50cfOracle\u90a3\u6837\u2f40\u6301\u51fd\u6570\u7d22\u5f15\uff0c\u5373\u4f7fd\u5b57\u6bb5\u6709\u7d22\u5f15\uff0c\u4e5f\u4f1a\u76f4\u63a5\u5168\u8868\u626b\u63cf\u3002
    \u5e94\u6539\u4e3a > SELECT\u00a0FROM t WHERE d >= \u20182016-01-01\u2019;<\/li>\n
  3. \u7528IN\u6765\u66ff\u6362OR\u4f4e\u6548\u67e5\u8be2
    \u6162SELECT\u00a0FROM t WHERE LOC_ID = 10 OR LOC_ID = 20 OR LOC_ID = 30;
    \u9ad8\u6548\u67e5\u8be2 > SELECT\u00a0FROM t WHERE LOC_IN IN (10,20,30);<\/li>\n
  4. LIKE\u53cc\u767e\u5206\u53f7\u65e0\u6cd5\u4f7f\u7528\u5230\u7d22\u5f15
    SELECT\u00a0FROM t WHERE name LIKE \u2018%de%\u2019;
    \u4f7f\u7528SELECT\u00a0FROM t WHERE name LIKE \u2018de%\u2019;<\/li>\n
  5. \u5206\u7ec4\u7edf\u8ba1\u53ef\u4ee5\u7981\u6b62\u6392\u5e8f
    SELECT goods_id,count() FROM t GROUP BY goods_id;
    \u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cMySQL\u5bf9\u6240\u6709GROUP BY col1\uff0ccol2\u2026\u7684\u5b57\u6bb5\u8fdb\u2f8f\u6392\u5e8f\u3002
    \u5982\u679c\u67e5\u8be2\u5305\u62ecGROUP BY\uff0c\u60f3\u8981\u907f\u514d\u6392\u5e8f\u7ed3\u679c\u7684\u6d88\u8017\uff0c\u5219\u53ef\u4ee5\u6307\u5b9aORDER BY NULL\u7981\u6b62\u6392\u5e8f\u3002
    \u4f7f\u7528SELECT goods_id,count() FROM t GROUP BY goods_id ORDER BY NULL;<\/li>\n
  6. \u7981\u6b62\u4e0d\u5fc5\u8981\u7684ORDER
    BY\u6392\u5e8fSELECT count(1) FROM user u LEFT JOIN user_info i ON u.id = i.user_id WHERE 1 = 1 ORDER BY u.create_time DESC;
    \u4f7f\u7528SELECT count(1) FROM user u LEFT JOIN user_info i ON u.id = i.user_id;9<\/li>\n<\/ol>\n

    \u603b\u7ed3<\/p>\n

    \u4efb\u4f55\u4e1c\u897f\u4e0d\u5e94\u8fc7\u91cd\u5173\u6ce8\u5176\u5916\u8868\uff0c\u8981\u6ce8\u91cd\u5185\u5728\u7684\u4e1c\u897f\uff0c\u5f80\u5f80\u7eda\u4e3d\u7684\u5916\u8868\u4e0b\u4f1a\u6709\u5bf9\u5e94\u7684\u8d1f\u62c5\u548c\u635f\u8017\u3002
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    \u4f5c\u8005\uff1a\u5b89\u7532\u8212<\/p>\n

    https:\/\/segmentfault.com\/a\/1190000042307769<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

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