mysql.component 系统表包含有关当前已加载组件的信息，并显示哪些组件已使用 INSTALL COMPONENT 注册。从该表中选择可以显示已安装的组件。例如：The mysql.component system table contains information about currently loaded components and shows which components have been registered using INSTALL COMPONENT. Selecting from the table shows which components are installed. For example:

mysql> SELECT * FROM mysql.component;
+--------------+--------------------+------------------------------------+
| component_id | component_group_id | component_urn                      |
+--------------+--------------------+------------------------------------+
|            1 |                  1 | file://component_validate_password |
|            2 |                  2 | file://component_log_sink_json     |
+--------------+--------------------+------------------------------------+

component_id 和 component_group_id 的值仅供内部使用。component_urn 是在 INSTALL COMPONENT 和 UNINSTALL COMPONENT 语句中用于加载和卸载组件的 URN。The component_id and component_group_id values are for internal use. The component_urn is the URN used in INSTALL COMPONENT and UNINSTALL COMPONENT statements to load and unload the component.