为了保证安全，日志操作需要保证不受信的代码无法修改日志控制配置。

The principal security requirement is that untrusted code should not be able to change the logging configuration.

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假如存放事务日志的磁盘有问题，也可以修改事务日志的存放位置。

The transaction log location can be changed during restore in case there is ever a problem with the disk that has the transaction log.

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按照以下步骤修改日志级别。

To change the log level, do the following.

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