收缩数据库日志

SET NOCOUNT ON
DECLARE @LogicalFileName sysname, @MaxMinutes INT, @NewSize INT

USE AESDB -- 要操作的数据库名
SELECT @LogicalFileName = 'AESDB_Log', @MaxMinutes = 10, @NewSize = 5
-- 日志文件名 -- Limit on time allowed to wrap log.  -- 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
 WHILE ((@Counter < @OriginalSize / 16) AND (@Counter < 50000))
 BEGIN -- update
  INSERT DummyTrans VALUES ('Fill Log')
  DELETE DummyTrans
  SELECT @Counter = @Counter + 1
 END
 EXEC (@TruncLog)
END
SELECT 'Final Size of ' + db_name() + ' LOG is ' +
CONVERT(VARCHAR(30),size) + ' 8K pages or ' +
CONVERT(VARCHAR(30),(size*8/1024)) + 'MB'
FROM sysfiles
WHERE name = @LogicalFileName
DROP TABLE DummyTrans
SET NOCOUNT OFF