数据库备份与还原

2015-09-14 12:14 qy1141 阅读(285) 评论(0) 编辑收藏举报

备份数据库有很多种方式，我们选择的方案是完整备份+日志备份，等将来数据库大了以后，将变为完整备份+差异备份+日志备份，如图：

每天晚上进行数据库的完整备份，每30分钟进行日志备份，每次日志备份后系统会自动截断日志文件，这也能有效保证日志文件不会无限的增大。

--完整备份数据库
declare @toPath nvarchar(100)
set @toPath = \'D:\bak\Test_\' + REPLACE(convert(nvarchar,GETDATE(),20),\':\',\'.\') + \'.bak\'
backup database Test to disk = @toPath  with COMPRESSION,password = \'123\'

--备份事务日志
declare @toLogPath nvarchar(100)
set @toLogPath = \'D:\bak\Test_log_\' + REPLACE(convert(nvarchar,GETDATE(),20),\':\',\'.\') + \'.bak\'
BACKUP LOG Test To disk= @toLogPath

--备份尾事务日志（在数据库出现故障时，备份最后的日志）
BACKUP LOG Test To disk= @toLogPath with norecovery

--还原数据库
RESTORE DATABASE Test
FROM DISK = \'D:\bak\Test_2015-09-13 07.15.53.bak\' 
with norecovery,password = \'123\',
MOVE N\'OA\' TO N\'D:\db\Test.mdf\',  
MOVE N\'OA_log\' TO N\'D:\db\Test.ldf\'

--还原事务日志(中间日志)
RESTORE log Test
FROM DISK = \'D:\bak\Test_log2015-09-13 07.16.47.bak\' with norecovery

--还原事务日志(最后日志)
RESTORE log Test  
FROM DISK = \'D:\bak\Test_log2015-09-13 07.17.00.bak\' WITH recovery

--用stopat恢复尾日志备份
RESTORE log [Test]  
FROM DISK = \'D:\bak\Test_2015-07-19 19.07.40.bak\' WITH FILE = 3,stopat = \'\',recovery

--根据备份文件获取数据库逻辑文件名
RESTORE FILELISTONLY FROM DISK = \'D:\bak\Test_2015-09-13 07.15.53.bak\' with password = \'123\'