Cách 1:
USE AdventureWorks2012;
GO
-- Truncate the log by changing the database recovery model to SIMPLE.
ALTER DATABASE AdventureWorks2012
SET RECOVERY SIMPLE;
GO
-- Shrink the truncated log file to 1 MB.
DBCC SHRINKFILE (AdventureWorks2012_Log, 1);
GO
-- Reset the database recovery model.
ALTER DATABASE AdventureWorks2012
SET RECOVERY FULL;
Cách 2
use [database]
ALTER DATABASE [database] SET RECOVERY SIMPLE
declare @log_File_Name varchar(200)
select @log_File_Name = name from sysfiles where filename like '%LDF'
declare @i int = FILE_IDEX ( @log_File_Name)
dbcc shrinkfile ( @i , 1)
ALTER DATABASE [database] SET RECOVERY FULL
