[MySQL]スロークエリログの出力設定

毎回ググってしまうので・・・

スロークエリとしての判定時間を設定

mysql> SHOW GLOBAL VARIABLES LIKE '%query_time%' ;
+-----------------+-----------+
| Variable_name   | Value     |
+-----------------+-----------+
| long_query_time | 10.000000 |
+-----------------+-----------+
1 row in set (0.24 sec)

mysql> SET GLOBAL long_query_time = 0.5 ;
Query OK, 0 rows affected (0.25 sec)

mysql> SHOW GLOBAL VARIABLES LIKE '%query_time%' ;
+-----------------+----------+
| Variable_name   | Value    |
+-----------------+----------+
| long_query_time | 0.500000 |
+-----------------+----------+
1 row in set (0.00 sec)

ログ出力するように

mysql> SHOW GLOBAL VARIABLES LIKE '%slow_query%' ;
+---------------------+--------------------------------+
| Variable_name       | Value                          |
+---------------------+--------------------------------+
| slow_query_log      | OFF                            |
| slow_query_log_file | /var/lib/mysql/hoge-slow.log |
+---------------------+--------------------------------+
2 rows in set (0.00 sec)

mysql>  SET GLOBAL slow_query_log = 'ON' ;
Query OK, 0 rows affected (0.26 sec)


mysql> FLUSH LOGS ;
Query OK, 0 rows affected (0.10 sec)

mysql> SHOW GLOBAL VARIABLES LIKE '%slow_query%' ;
+---------------------+--------------------------------+
| Variable_name       | Value                          |
+---------------------+--------------------------------+
| slow_query_log      | ON                             |
| slow_query_log_file | /var/lib/mysql/hoge-slow.log |
+---------------------+--------------------------------+
2 rows in set (0.00 sec)


mysql> FLUSH LOGS ;