MySQL慢查詢日誌總結
阿新 • • 發佈：2018-12-30
mysql> show variables like '%log_output%';
+---------------+-------+
| Variable_name | Value |+---------------+-------+
| log_output | FILE |+---------------+-------+
1 row in set (0.00 sec)
mysql> set global log_output='TABLE';
Query OK, 0 rows affected (0.00 sec)mysql> show variables like '%log_output%';
+---------------+-------+
| Variable_name | Value |+---------------+-------+
| log_output | TABLE |+---------------+-------+
1 row in set (0.00 sec)
mysql> select sleep(5) ;+----------+
| sleep(5) |
+----------+
| 0 |
+----------+
1 row in set (5.00 sec)
mysql>
mysql> select * from mysql.slow_log;
+---------------------+---------------------------+------------+-----------+-----------+---------------+----+----------------+-----------+-----------+-----------------+-----------+
| start_time | user_host | query_time | lock_time | rows_sent | rows_examined | db | last_insert_id | insert_id | server_id | sql_text | thread_id |
+---------------------+---------------------------+------------+-----------+-----------+---------------+----+----------------+-----------+-----------+-----------------+-----------+
| 2016-06-16 17:37:53 | root[root] @ localhost [] | 00:00:03 | 00:00:00 | 1 | 0 | | 0 | 0 | 1 | select sleep(3) | 5 || 2016-06-16 21:45:23 | root[root] @ localhost [] | 00:00:05 | 00:00:00 | 1 | 0 | | 0 | 0 | 1 | select sleep(5) | 2 |+---------------------+---------------------------+------------+-----------+-----------+---------------+----+----------------+-----------+-----------+-----------------+-----------+
2 rows in set (0.00 sec)
mysql>