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。

  1. USE information_schema;
  2. DESC session_variables;
  1. +----------------+---------------+------+------+---------+-------+
  2. | Field          | Type          | Null | Key  | Default | Extra |
  3. +----------------+---------------+------+------+---------+-------+
  4. | VARIABLE_NAME  | varchar(64)   | YES  |      | NULL    |       |
  5. | VARIABLE_VALUE | varchar(1024) | YES  |      | NULL    |       |
  6. +----------------+---------------+------+------+---------+-------+
  7. 2 rows in set (0.00 sec)
  1. SELECT * FROM session_variables ORDER BY variable_name LIMIT 10;
  1. +-----------------------------------+------------------+
  2. | VARIABLE_NAME                     | VARIABLE_VALUE   |
  3. +-----------------------------------+------------------+
  4. | allow_auto_random_explicit_insert | off              |
  5. | auto_increment_increment          | 1                |
  6. | auto_increment_offset             | 1                |
  7. | autocommit                        | 1                |
  8. | automatic_sp_privileges           | 1                |
  9. | avoid_temporal_upgrade            | 0                |
  10. | back_log                          | 80               |
  11. | basedir                           | /usr/local/mysql |
  12. | big_tables                        | 0                |
  13. | bind_address                      | *                |
  14. +-----------------------------------+------------------+
  15. 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。