Home Database Mysql Tutorial 数据库清除日志文件(LDF文件过大)

数据库清除日志文件(LDF文件过大)

Jun 07, 2016 pm 05:59 PM
database clear log

数据库清除日志文件,(LDF文件过大),一般情况下,有更简单的方法,需要在sqlserver查询执行。

清除日志:
代码如下:
DECLARE @LogicalFileName sysname,
@MaxMinutes INT,
@NewSize INT
USE szwzcheck -- 要操作的数据库名
SELECT @LogicalFileName = 'szwzcheck_Log', -- 日志文件名
@MaxMinutes = 10, -- Limit on time allowed to wrap log.
@NewSize = 20 -- 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
AND @OriginalSize = (SELECT size FROM sysfiles WHERE name =
@LogicalFileName)
AND (@OriginalSize * 8 /1024) > @NewSize
BEGIN -- Outer loop.
SELECT @Counter = 0
WHILE ((@Counter 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

把szwzcheck换成你数据库的名字即可,在查询分析器里面运行。
有全角的空格(为了显示好看),你自己把他换一下.

脚本之家编辑注:
一般情况下,用下面的语句更简单
代码如下:
DUMP TRANSACTION [jb51] WITH NO_LOG
BACKUP LOG [jb51] WITH NO_LOG
DBCC SHRINKDATABASE([jb51])

其中jb51就是你要处理的数据库名。
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