本文將向大家講解一下怎樣縮小 SQL Server 的數據庫日志文件，比較簡單，一看就能明白。
問：我的數據庫實際大小為600MB, 日志文件實際大小為33MB, 但日志文件占用空間為2.8GB!我曾經試了幾種方式，SHIRNK DATABASE， TRUNCATE LOG FILE, 都沒辦法將文件縮小。
答：你可以把下面的代碼COPY到查詢分析器裡，，然後修改其中的3個參數(數據庫名，日志文件名，和目標日志文件的大小)，運行即可。
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SET NOCOUNT ON
DECLARE @LogicalFileName sysname,
@MaxMinutes INT,
@NewSize INT
USE Marias
-- 要操作的數據庫名
SELECT @LogicalFileName = 'Marias_log'
-- 日志文件名
@MaxMinutes = 10,
-- Limit on time allowed to wrap log.
@NewSize = 100
-- 你想設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
