本例，快速清理“students”數據庫的日志，清理后日志文件不足1M。

USE [master]  
GO  
ALTER DATABASE students SET RECOVERY SIMPLE WITH NO_WAIT  
GO  
ALTER DATABASE students SET RECOVERY SIMPLE  
GO  
USE students  GO--此處需要注意，并非所有數據庫的日志文件名都是“數據庫名_log”  DBCC SHRINKFILE (N'students_log' , 0,TRUNCATEONLY)  
GO  
USE [master]  
GO  
ALTER DATABASE students SET RECOVERY FULL WITH NO_WAIT  
GO  
ALTER DATABASE students SET RECOVERY FULL  
GO  --查詢指定數據庫的日志文件名稱  
USE students   
GO  
SELECT name FROM SYS.database_files WHERE type_desc='LOG'