方法一

一般情況下，SQL數(shù)據(jù)庫的收縮并不能很大程度上減小數(shù)據(jù)庫大小，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)庫日志過大1、設(shè)置數(shù)據(jù)庫模式為簡單模式：打開SQL企業(yè)管理器，在控制臺根目錄中依次點開Microsoft SQL Server-->SQL Server組-->雙擊打開你的服務(wù)器-->雙擊打開數(shù)據(jù)庫目錄-->選擇你的數(shù)據(jù)庫名稱（如論壇數(shù)據(jù)庫Forum）-->然后點擊右鍵選擇屬性-->選擇選項-->在故障還原的模式中選擇“簡單”，然后按確定保存2、在當(dāng)前數(shù)據(jù)庫上點右鍵，看所有任務(wù)中的收縮數(shù)據(jù)庫，一般里面的默認(rèn)設(shè)置不用調(diào)整，直接點確定3、收縮數(shù)據(jù)庫完成后，建議將您的數(shù)據(jù)庫屬性重新設(shè)置為標(biāo)準(zhǔn)模式，操作方法同第一點，因為日志在一些異常情況下往往是恢復(fù)數(shù)據(jù)庫的重要依據(jù)

方法二

SET NOCOUNT ONDECLARE @LogicalFileName sysname, @MaxMinutes INT, @NewSize INT

USE;;tablename;;-- 要操作的數(shù)據(jù)庫名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 / initializeDECLARE @OriginalSize intSELECT @OriginalSize = size FROM sysfiles WHERE name = @LogicalFileNameSELECT '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 = @LogicalFileNameCREATE TABLE DummyTrans (DummyColumn char (8000) not null)

DECLARE @CounterINT, @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); ENDSELECT '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 = @LogicalFileNameDROP TABLE DummyTransSET NOCOUNT OFF