收缩数据库日志

/****** Script for SelectTopNRows command from SSMS  ******/

      
USE [master]
GO
ALTER DATABASE AdventureWorks2012 SET RECOVERY SIMPLE WITH NO_WAIT
GO
ALTER DATABASE AdventureWorks2012 SET RECOVERY SIMPLE --简单模式
GO
USE AdventureWorks2012
GO
DBCC SHRINKFILE (N'AdventureWorks2012_Log' , 11, TRUNCATEONLY) 

GO

--这里的DNName_Log 如果不知道在sys.database_files里是什么名字的话，可以用以下注释的语句进行查询

USE AdventureWorks2012

GO

SELECT file_id, name FROM sys.database_files;

GO
USE [master]
GO
ALTER DATABASE AdventureWorks2012 SET RECOVERY FULL WITH NO_WAIT
GO
ALTER DATABASE AdventureWorks2012 SET RECOVERY FULL --还原为完全模式
GO

 BACKUP LOG [EMAS_BASE] TO DISK='NUL:'   -- 备份事务日志，备份成NUL，就不用占硬盘空间
         Go
      USE [EMAS_BASE];
        GO
      DBCC SHRINKFILE (EMAS_BASE_1_Log, 7);     --收缩数据库日志文件，收到7M
       GO