SQLSERVER日志清理程序

SET NOCOUNT ON
DECLARE @LogicalFileName sysname,@MaxMinutes INT,@NewSize INT
USE SJDB -- 要操作的数据库名
SELECT @LogicalFileName = 'SJDB_Log', -- 日志文件名
@MaxMinutes = 10, -- Limit on time allowed to wrap log.
@NewSize = 1 -- 你想设定的日志文件的大小(M)

-- Setup / initialize          
DECLARE @OriginalSize int
SELECT @OriginalSize = size  FROM sysfiles  WHERE name = @LogicalFileName

SELECT 'Original Size of ' + db_name() + ' LOG is ' +
CONVERT(VARCHAR(30),@OriginalSize) + ' 8K pages or ' +
CONVERT(VARCHAR(30),(@OriginalSize*8/1024)) + 'MB'
FROM sysfiles
WHERE name = @LogicalFileName

CREATE TABLE DummyTrans(DummyColumn char (8000) not null)
DECLARE @Counter INT,@StartTime DATETIME,@TruncLog VARCHAR(255)

SELECT @StartTime = GETDATE(),@TruncLog = 'BACKUP LOG ' + db_name() + ' WITH TRUNCATE_ONLY'
DBCC SHRINKFILE (@LogicalFileName, @NewSize)
EXEC (@TruncLog)
-- Wrap the log if necessary.
WHILE @MaxMinutes > DATEDIFF (mi, @StartTime, GETDATE()) -- time has not expired
AND @OriginalSize = (SELECT size  FROM sysfiles WHERE name = @LogicalFileName)
AND (@OriginalSize * 8 /1024) > @NewSize

BEGIN -- Outer loop.
SELECT @Counter = 0