MYSQL-SLOWLOG

1、相关参数：

mysql> show variables like '%slow%';

+---------------------+---------------------------

| Variable_name       | Value

+---------------------+---------------------------

| log_slow_queries     | ON

| slow_launch_time     | 2

| slow_query_log       | ON

| slow_query_log_file | C:\Documents and Settings\

+---------------------+---------------------------

4 rows in set (0.00 sec)

2、设定 long_query_time=1；

mysql> show variables like '%long%';

+---------------------------------------------------+----------+

| Variable_name                                     | Value     |

+---------------------------------------------------+----------+

| long_query_time                                   | 1.000000 |

| max_long_data_size                                 | 1048576   |

| performance_schema_events_waits_history_long_size | 10000     |

+---------------------------------------------------+----------+

3 rows in set (0.00 sec)

记录位置：

mysql> show variables like 'log_output';

+---------------+-------+

| Variable_name | Value |

+---------------+-------+

| log_output     | FILE   |

+---------------+-------+

1 row in set (0.00 sec)

慢查询日志记录：

# Time: 131213 11:22:01

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 3.593750   Lock_time: 0.000000 Rows_sent: 131072   Rows_examined: 131072

use test;

SET timestamp=1386904921;

select * from test;

3、不使用索引的查询记录到slowlog中：

mysql> show variables like 'log_queries%';

+-------------------------------+-------+

| Variable_name                 | Value |

+-------------------------------+-------+

| log_queries_not_using_indexes | OFF   |

+-------------------------------+-------+

1 row in set (0.00 sec)

mysql> set log_queries_not_using_indexes=on;

ERROR 1229 (HY000): Variable 'log_queries_not_using_indexes' is a GLOBAL variable and should be set with SET GLOBAL

mysql> set gloabl log_queries_not_using_indexes=on;

ERROR 1193 (HY000): Unknown system variable 'gloabl'

mysql> set global log_queries_not_using_indexes=on;

Query OK, 0 rows affected (0.00 sec)

mysql> show variables like 'log_queries%';

+-------------------------------+-------+

| Variable_name                 | Value |

+-------------------------------+-------+

| log_queries_not_using_indexes | ON     |

+-------------------------------+-------+

1 row in set (0.00 sec)

# Time: 131213 11:38:47

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 3.453125   Lock_time: 0.000000 Rows_sent: 131072   Rows_examined: 131072

SET timestamp=1386905927;

select * from test.test;

记录查过1秒并没有用索引的记录下来了！！！