方法一
一般情況下，SQL數(shù)據(jù)庫(kù)的收縮并不能很大程度上減小數(shù)據(jù)庫(kù)大小，其主要作用是收縮日志大小，應(yīng)當(dāng)定期進(jìn)行此操作以免數(shù)據(jù)庫(kù)日志過(guò)大
1、設(shè)置數(shù)據(jù)庫(kù)模式為簡(jiǎn)單模式：打開(kāi)SQL企業(yè)管理器，在控制臺(tái)根目錄中依次點(diǎn)開(kāi)Microsoft SQL Server-->SQL Server組-->雙擊打開(kāi)你的服務(wù)器-->雙擊打開(kāi)數(shù)據(jù)庫(kù)目錄-->選擇你的數(shù)據(jù)庫(kù)名稱(chēng)(如論壇數(shù)據(jù)庫(kù)Forum)-->然后點(diǎn)擊右鍵選擇屬性-->選擇選項(xiàng)-->在故障還原的模式中選擇“簡(jiǎn)單”，然后按確定保存
2、在當(dāng)前數(shù)據(jù)庫(kù)上點(diǎn)右鍵，看所有任務(wù)中的收縮數(shù)據(jù)庫(kù)，一般里面的默認(rèn)設(shè)置不用調(diào)整，直接點(diǎn)確定
3、收縮數(shù)據(jù)庫(kù)完成后，建議將您的數(shù)據(jù)庫(kù)屬性重新設(shè)置為標(biāo)準(zhǔn)模式，操作方法同第一點(diǎn)，因?yàn)槿罩驹谝恍┊惓Ｇ闆r下往往是恢復(fù)數(shù)據(jù)庫(kù)的重要依據(jù)
方法二
SET NOCOUNT ON DECLARE @LogicalFileName sysname,
@MaxMinutes INT,
@NewSize INT
USE tablename -- 要操作的數(shù)據(jù)庫(kù)名
SELECT @LogicalFileName = ’tablename_log’, -- 日志文件名
@MaxMinutes = 10, -- Limit on time allowed to wrap log.
@NewSize = 1 -- 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