How can you compress log files in SQL Server?

In SQL Server, you can compress log files by following these steps:

1. Run the following command to check the current usage of the log file:

DBCC SQLPERF(LOGSPACE);

1. Make sure that the log file is not being used by any active transaction. Check the status of active transactions if needed.

DBCC OPENTRAN;

1. Execute the following command to backup the transaction log and truncate the log file:

BACKUP LOG [数据库名] WITH TRUNCATE_ONLY;

1. Use the following command to shrink the log files:

DBCC SHRINKFILE ([日志文件名], 1);

Please be aware that shrinking log files may result in file growth and could impact performance. Therefore, before performing this operation, make sure to back up the database and understand the potential risks.