SQL日志文件過(guò)大問(wèn)題的解決方法

很多獨(dú)立服務(wù)器客戶反饋數(shù)據(jù)庫(kù)日志文件過(guò)大，嚴(yán)重浪費(fèi)磁盤(pán)資源，數(shù)據(jù)庫(kù)實(shí)際大小為600M, 日志文件實(shí)際大小為33M, 但日志文件占用空間為2.8G!!!
我們及時(shí)反饋給我們的研發(fā)部門(mén)，他們寫(xiě)了一個(gè)腳本，就可以將日志文件縮小到自己想要的大小了。把代碼COPY到查詢分析器里，，然后修改其中的3個(gè)參數(shù)(紅色字體部分)，運(yùn)行即可(測(cè)試通過(guò)，請(qǐng)獨(dú)立服務(wù)器客戶測(cè)試)
-----
SET NOCOUNT ON

DECLARE @LogicalFileName sysname,

@MaxMinutes INT,

@NewSize INT

USE data_db -- 要操作的數(shù)據(jù)庫(kù)名

SELECT @LogicalFileName = 'data_db_log', -- 日志文件名

@MaxMinutes = 10, -- Limit on time allowed to wrap log.

@NewSize = 100 -- 你想設(shè)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

以上代碼用T-SQL語(yǔ)言實(shí)現(xiàn)。