Mariadb开启慢查询，Mariadb开启慢

Mariadb开启慢查询，Mariadb开启慢

查看一下mariadb是否开启慢查询：

show variables like 'slow_query%';

查看慢查询时间设置为多少秒：

show variables like 'long_query_%';

设置配置文件：

vim /etc/my.cnf.d/server.cnf

[mysqld]
slow_query_log = ON
slow_query_log_file = /usr/local/mysql/data/slow.log
long_query_time = 1

MariaDB [(none)]> show variables like 'long_query_%';
+-----------------+----------+
| Variable_name   | Value    |
+-----------------+----------+
| long_query_time | 1.000000 |
+-----------------+----------+
1 row in set (0.00 sec)

测试慢查询：

MariaDB [(none)]> select sleep(2);

查看慢查询日志：

[root@localhost vhosts]# tailf /var/lib/mysql/localhost-slow.log

/usr/sbin/mysqld, Version: 10.2.6-MariaDB (MariaDB Server). started with:
Tcp port: 3306  Unix socket: /var/lib/mysql/mysql.sock
Time                 Id Command    Argument
/usr/sbin/mysqld, Version: 10.2.6-MariaDB-log (MariaDB Server). started with:
Tcp port: 0  Unix socket: /var/lib/mysql/mysql.sock
Time                 Id Command    Argument
# Time: 170711 17:54:13
# User@Host: root[root] @ localhost []
# Thread_id: 8  Schema:   QC_hit: No
# Query_time: 2.001172  Lock_time: 0.000000  Rows_sent: 1  Rows_examined: 0
# Rows_affected: 0
SET timestamp=1499766853;
select sleep(2);