mysql下令行怎么开启慢查询日志
发布时间:09/01 来源:未知 浏览:
关键词:
mysql命令行开启慢查询日志的办法:施行【set global slow_query_log='ON';】语句即可开启。通过施行【show variables like "%slow%";】语句可以检查慢查询日志可否已开启。
详细办法:
(引荐教程:mysql教程)
查看一下默许慢查询的时间10秒
mysql> show variables like "%long%"; +-----------------+-----------+ | Variable_name | Value | +-----------------+-----------+ | long_query_time | 10.000000 | +-----------------+-----------+ 1 row in set (0.00 sec)
设定成3秒,加上global,退出再次进入生效
mysql> set global long_query_time=3; Query OK, 0 rows affected (0.00 sec)
查看一下慢查询是不是已经开启
mysql> show variables like "%slow%"; +---------------------+---------------------------------+ | Variable_name | Value | +---------------------+---------------------------------+ | log_slow_queries | OFF | | slow_launch_time | 2 | | slow_query_log | OFF | | slow_query_log_file | /usr/local/mysql/mysql-slow.log | +---------------------+---------------------------------+ 4 rows in set (0.00 sec)
启用慢查询
mysql> set global slow_query_log='ON'; Query OK, 0 rows affected (0.28 sec)
查看可否已经开启
mysql> show variables like "%slow%"; +---------------------+---------------------------------+ | Variable_name | Value | +---------------------+---------------------------------+ | log_slow_queries | ON | | slow_launch_time | 2 | | slow_query_log | ON | | slow_query_log_file | /usr/local/mysql/mysql-slow.log | +---------------------+---------------------------------+ 4 rows in set (0.00 sec)
相关引荐:php培训
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