也谈如何缩小SQL SERVER日志文件
类别: MSSQL教程 
前几天也碰到日志文件过大的问题，数据库实际大小为600M, 日志文件实际大小为33M, 但日志文件占用空间为2.8G!!!
试了多种方式，SHIRNK DATABASE， TRUNCATE LOG FILE, 都没办法将文件缩小。无论如何，这应该算SQL SERVER的一个BUG吧。
后来找到下面的代码，就可以将日志文件缩小到自己想要的大小了。把代码COPY到查询分析器里，，然后修改其中的3个参数(数据库名，日志文件名，和目标日志文件的大小)，运行即可(我已经用过多次了)
-----
SET NOCOUNT ON
DECLARE @LogicalFileName sysname,
@MaxMinutes INT,
@NewSize INT
USE Marias -- 要操作的数据库名
SELECT @LogicalFileName = \'Marias_log\', -- 日志文件名
@MaxMinutes = 10, -- Limit on time allowed to wrap log.
@NewSize = 100 -- 你想设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
试了多种方式，SHIRNK DATABASE， TRUNCATE LOG FILE, 都没办法将文件缩小。无论如何，这应该算SQL SERVER的一个BUG吧。
后来找到下面的代码，就可以将日志文件缩小到自己想要的大小了。把代码COPY到查询分析器里，，然后修改其中的3个参数(数据库名，日志文件名，和目标日志文件的大小)，运行即可(我已经用过多次了)
-----
SET NOCOUNT ON
DECLARE @LogicalFileName sysname,
@MaxMinutes INT,
@NewSize INT
USE Marias -- 要操作的数据库名
SELECT @LogicalFileName = \'Marias_log\', -- 日志文件名
@MaxMinutes = 10, -- Limit on time allowed to wrap log.
@NewSize = 100 -- 你想设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
- 上一篇: 无数据库日志文件恢复数据库方法两则(一)
- 下一篇: IDENTITY列的一个有用操作
