WSREP_INFO Plugin

The WSREP_INFO plugin creates the WSREP_MEMBERSHIP and the WSREP_STATUS tables in the INFORMATION_SCHEMA database. The plugin also adds the SHOW WSREP_MEMBERSHIP and SHOW WSREP_STATUS statements. These tables and statements provide information about Galera. Only users with the SUPER privilege can access information.

Installing the Plugin

Although the plugin's shared library is distributed with MariaDB by default, the plugin is not actually installed by MariaDB by default. There are two methods that can be used to install the plugin with MariaDB.

The first method can be used to install the plugin without restarting the server. You can install the plugin dynamically by executing INSTALL SONAME or INSTALL PLUGIN. For example:

INSTALL SONAME 'wsrep_info';

The second method can be used to tell the server to load the plugin when it starts up. The plugin can be installed this way by providing the --plugin-load or the --plugin-load-add options. This can be specified as a command-line argument to mysqld or it can be specified in a relevant server option group in an option file. For example:

[mariadb]
...
plugin_load_add = wsrep_info

Uninstalling the Plugin

You can uninstall the plugin dynamically by executing UNINSTALL SONAME or UNINSTALL PLUGIN. For example:

UNINSTALL SONAME 'wsrep_info';

If you installed the plugin by providing the --plugin-load or the --plugin-load-add options in a relevant server option group in an option file, then those options should be removed to prevent the plugin from being loaded the next time the server is restarted.

Example

SHOW TABLES FROM information_schema LIKE 'WSREP%';
+---------------------------------------+
| Tables_in_information_schema (WSREP%) |
+---------------------------------------+
| WSREP_STATUS                          |
| WSREP_MEMBERSHIP                      |
+---------------------------------------+

Versions