[SQL]資料庫 LOG 檔案太大怎麼清除？(MS SQL 清除 LOG 並縮減空間的語法)

一般時候我們都用以下的語法進行清理

DUMP TRANSACTION {DBName} WITH NO_LOG

可是實體的檔案大小卻不會減少，一樣佔用那麼多的硬碟空間。
我曾經在網路上找到以下的語法，分享給大家參考。

SET NOCOUNT ON
DECLARE @LogicalFileName sysname, @MaxMinutes INT, @NewSize INT

USE {DBName ex HRMS} -- 要操作的資料庫名
SELECT
@LogicalFileName = '{Log file name ex HRMS_Log}', -- 日誌文件名
@MaxMinutes = 10, -- Limit on time allowed to wrap log. (M)
@NewSize = 1 -- 你想設定的日誌文件的大小(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

如果不要想得那麼複雜和看那些資訊，直接這樣下眼睛閉一閉就過去了...

USE @DBName
DBCC SHRINKFILE (@LogicalFileName, @NewSize)

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