mysql 5.7 开启慢查询
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创建时间:2021-11-17
开启慢查询(查看慢查询是否开启，并开启)
mysql> show variables like 'slow_query_log';
+----------------+-------+
| Variable_name | Value |
+----------------+-------+
| slow_query_log | OFF |
+----------------+-------+
1 row in set (0.01 sec)
mysql> SET GLOBAL slow_query_log = on;
Query OK, 0 rows affected (0.00 sec)
mysql> show variables like 'slow_query_log';
+----------------+-------+
| Variable_name | Value |
+----------------+-------+
| slow_query_log | ON |
+----------------+-------+
1 row in set (0.00 sec)
查看并设置慢查询时间
mysql> show variables like 'long_query_time';
+-----------------+-----------+
| Variable_name | Value |
+-----------------+-----------+
| long_query_time | 10.000000 |
+-----------------+-----------+
1 row in set (0.00 sec)
mysql> SET long_query_time = 5 ;
Query OK, 0 rows affected (0.00 sec)
mysql> show variables like 'long_query_time';
+-----------------+----------+
| Variable_name | Value |
+-----------------+----------+
| long_query_time | 5.000000 |
+-----------------+----------+
1 row in set (0.00 sec)
查看慢查询日志文件位置
mysql> show variables like 'slow_query_log_file';
+---------------------+-----------------------------------+
| Variable_name | Value |
+---------------------+-----------------------------------+
| slow_query_log_file | /var/lib/mysql/localhost-slow.log |
+---------------------+-----------------------------------+
1 row in set (0.00 sec)
以上三个配置可以修改配置文件，使下次mysql重启自动生效。编辑/etc/my.cnf下的MySQL的配置文件，加上下面内容
[mysqld]
-- 下面这三个必须填写在mysqld下
slow_query_log=ON
slow_query_log_file=/var/lib/mysql/localhost-slow.log
long_query_time=5
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