设置指定日志开关的严重级别。

Sets the severity level of the specified log switch.

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如果事务日志用于备份，只在完全备份计划(每周一次)之前使用此开关。

If transaction logging is used for backups, use this switch only before the full backup schedule (once a week).

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运行不带此开关选项（默认设置）的压缩不会更改 DBIID；如果使用事务日志，可以让它每夜都运行，回收空白，但不减少文件的大小。

Running Compact with no switch (default setting) does not change the DBIID; it can run nightly if transaction logging is used, reclaiming white space, but not reducing file size.

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