SHOW CONFIG

SHOW CONFIG

SHOW CONFIG 语句用于展示 TiDB 各个组件当前正在应用的配置，请注意，配置与系统变量作用于不同维度，请不要混淆，如果希望获取系统变量信息，请使用 SHOW VARIABLES 语法。

语法图

ShowStmt:

ShowTargetFilterable:

示例

显示所有配置：

1. SHOW CONFIG;

1. +------+----------------+-------------------------------------------------+---------------------------------------------------------------------+
2. | Type | Instance       | Name                                            | Value                                                               |
3. +------+----------------+-------------------------------------------------+---------------------------------------------------------------------+
4. | tidb | 127.0.0.1:4000 | advertise-address                               | 127.0.0.1                                                           |
5. | tidb | 127.0.0.1:4000 | binlog.binlog-socket                            |                                                                     |
6. | tidb | 127.0.0.1:4000 | binlog.enable                                   | false                                                               |
7. ...
8. 120 rows in set (0.01 sec)

显示 type 是 tidb 的配置：

1. SHOW CONFIG WHERE type = 'tidb' AND name = 'advertise-address';

1. +------+----------------+-------------------+-----------+
2. | Type | Instance       | Name              | Value     |
3. +------+----------------+-------------------+-----------+
4. | tidb | 127.0.0.1:4000 | advertise-address | 127.0.0.1 |
5. +------+----------------+-------------------+-----------+
6. 1 row in set (0.05 sec)

也可以用 LIKE 子句来显示 type 是 tidb 的配置：

1. SHOW CONFIG LIKE 'tidb';

1. +------+----------------+-------------------------------------------------+---------------------------------------------------------------------+
2. | Type | Instance       | Name                                            | Value                                                               |
3. +------+----------------+-------------------------------------------------+---------------------------------------------------------------------+
4. | tidb | 127.0.0.1:4000 | advertise-address                               | 127.0.0.1                                                           |
5. | tidb | 127.0.0.1:4000 | binlog.binlog-socket                            |                                                                     |
6. | tidb | 127.0.0.1:4000 | binlog.enable                                   | false                                                               |
7. ...
8. 40 rows in set (0.01 sec)

MySQL 兼容性

该语句是 TiDB 对 MySQL 语法的扩展。

另请参阅

SHOW VARIABLES