USE [master]
GO


ALTER DATABASE DBName SET RECOVERY SIMPLE WITH NO_WAIT
GO

ALTER DATABASE DBName SET RECOVERY SIMPLE --简单模式
GO

USE DBName
GO

DBCC SHRINKFILE (N'DBName_log',0, TRUNCATEONLY) 
GO

USE [master]
GO

ALTER DATABASE DBName SET RECOVERY FULL WITH NO_WAIT
GO

ALTER DATABASE DBName SET RECOVERY FULL --还原为完全模式
GO

USE DBName 
GO

SELECT file_id, name FROM sys.database_files;
GO