要查看是否加载了密钥环插件，请检查 INFORMATION_SCHEMA.PLUGINS表格或使用SHOW PLUGINS语句（请参阅第 5.5.2 节，“获取服务器插件信息”）。例如：

mysql> SELECT PLUGIN_NAME, PLUGIN_STATUS
       FROM INFORMATION_SCHEMA.PLUGINS
       WHERE PLUGIN_NAME LIKE 'keyring%';
+--------------+---------------+
| PLUGIN_NAME  | PLUGIN_STATUS |
+--------------+---------------+
| keyring_file | ACTIVE        |
+--------------+---------------+