文档目录

SHOW CONFIG

警告:

当前该功能为实验特性,不建议在生产环境中使用。

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:

ShowStmt

ShowTargetFilterable:

ShowTargetFilterable

示例

显示所有配置:

SHOW CONFIG;
+------+----------------+-------------------------------------------------+---------------------------------------------------------------------+
| Type | Instance       | Name                                            | Value                                                               |
+------+----------------+-------------------------------------------------+---------------------------------------------------------------------+
| tidb | 127.0.0.1:4000 | advertise-address                               | 127.0.0.1                                                           |
| tidb | 127.0.0.1:4000 | alter-primary-key                               | false                                                               |
| tidb | 127.0.0.1:4000 | binlog.binlog-socket                            |                                                                     |
| tidb | 127.0.0.1:4000 | binlog.enable                                   | false                                                               |
...
120 rows in set (0.01 sec)

显示 typetidb 的配置:

SHOW CONFIG WHERE type = 'tidb' AND name = 'advertise-address';
+------+----------------+-------------------+-----------+
| Type | Instance       | Name              | Value     |
+------+----------------+-------------------+-----------+
| tidb | 127.0.0.1:4000 | advertise-address | 127.0.0.1 |
+------+----------------+-------------------+-----------+
1 row in set (0.05 sec)

也可以用 LIKE 子句来显示 typetidb 的配置:

SHOW CONFIG LIKE 'tidb';
+------+----------------+-------------------------------------------------+---------------------------------------------------------------------+
| Type | Instance       | Name                                            | Value                                                               |
+------+----------------+-------------------------------------------------+---------------------------------------------------------------------+
| tidb | 127.0.0.1:4000 | advertise-address                               | 127.0.0.1                                                           |
| tidb | 127.0.0.1:4000 | alter-primary-key                               | false                                                               |
| tidb | 127.0.0.1:4000 | binlog.binlog-socket                            |                                                                     |
| tidb | 127.0.0.1:4000 | binlog.enable                                   | false                                                               |
...
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