日期:2014-05-17 浏览次数:20593 次
/*
标题:清除日志和收缩日志
作者:爱新觉罗·毓华
时间:2008-07-14
地点:新疆乌鲁木齐
资料来源:深圳外经贸局年检数据库和CSDN会员adis789咨询sql server日志为啥会增长很快,
有一个程序每5秒钟写数据一次,然后数据库日志经常增长很快,怎么避免这样的事情发生呢?
怎么能让sql server日志增长不要这么快,数据文件才100M日志文件居然1G多。
*/
[code=SQL]
--清除日志:
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 < @OriginalSize / 16) AND (@Counter < 50000))
BEGIN -- update
INSERT DummyTrans VALUES ('Fill Log')