SESSION_VARIABLES

SESSION_VARIABLES 表提供了关于 session 变量的信息。表中的数据跟 SHOW SESSION VARIABLES 语句执行结果类似。

USE INFORMATION_SCHEMA; DESC SESSION_VARIABLES;

输出结果如下:

+----------------+---------------+------+------+---------+-------+ | Field | Type | Null | Key | Default | Extra | +----------------+---------------+------+------+---------+-------+ | VARIABLE_NAME | varchar(64) | YES | | NULL | | | VARIABLE_VALUE | varchar(1024) | YES | | NULL | | +----------------+---------------+------+------+---------+-------+ 2 rows in set (0.00 sec)

查看 SESSION_VARIABLES 表的前 10 条信息:

SELECT * FROM SESSION_VARIABLES ORDER BY variable_name LIMIT 10;

输出结果如下:

+-----------------------------------+------------------+ | VARIABLE_NAME | VARIABLE_VALUE | +-----------------------------------+------------------+ | allow_auto_random_explicit_insert | OFF | | auto_increment_increment | 1 | | auto_increment_offset | 1 | | autocommit | ON | | automatic_sp_privileges | 1 | | avoid_temporal_upgrade | OFF | | back_log | 80 | | basedir | /usr/local/mysql | | big_tables | OFF | | bind_address | * | +-----------------------------------+------------------+ 10 rows in set (0.00 sec)

SESSION_VARIABLES 表各列字段含义如下:

  • VARIABLE_NAME:数据库中 session 级变量的名称。
  • VARIABLE_VALUE:数据库中对应该 session 变量名的具体值。