为了清空数据库，程序使用一个无状态会话bean自动启动CMT。

To clear the database, the program USES a stateless session bean that automatically starts CMTs.

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如果您运行数据库(如oracle)，那么直到您清空数据库缓存，才会释放虚拟内存。

If you are running a database such as Oracle, virtual memory does not get released until you recycle your database.

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用户删除消息或清空垃圾后，必须压缩服务器上的邮件数据库。

After users delete messages or empty the trash, they must compact their mail database on the server.

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