我是mysql新手，正在尝试在mysql社区8.0.11上安装keyring。
我使用的是windows，我用

[mysqld]
early-plugin-load=keyring_file.dll

然后我跑了

mysql> install plugin keyring_file soname 'keyring_file.dll';

我得到一个警告

+---------+------+------------------------------------------------------------     --------------------------------+
| Level | Code | Message |
    +---------+------+--------------------------------------------------------------------------------------------+
| Warning | 29 | File 'C:\Program Files\MySQL\MySQL Server 8.0\lib\plugin' not found (OS errno 13 - Permission denied) |
+---------+------+--------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

我检查它是否激活

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

那个插件是活动的。
但是当我试图用

mysql> ALTER TABLE example ENCRYPTION='Y';
ERROR 3185 (HY000): Can't find master key from keyring, please check keyring
plugin is loaded.

我不明白我错过了什么。
plugin目录是正确的（c:\program files\mysql\mysql server 8.0\lib\plugin）
和keyring文件数据是一样的！