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HomeDatabaseMysql TutorialSQL server 2008 数据安全(备份和恢复数据库)

备份和恢复数据库对于数据库管理员来说是保证数据安全性的一项重要工作。SQL server 2008提供了高性能的备份和恢复功能,可以实现多种方式的数据库备份和恢复操作,避免了由于各种故障造成的损失而丢失数据

下边是我对部分内容的总结,里边偏向了T-SQL语句实现的总结,对于SQL Server Management Studio中对象管理器的操作并没有太多的总结,因为这些都有一些向导,而且,大部分都是在对应的节点,右击找相应的操作,相应的对象,然后根基向导去操作!

首先是大概知识点的总结:

下边是一些T-SQL语句对应的总结,1,管理备份设备的语句:

2,备份的语句:

3,数据恢复的对应语句:

最后,

上边讲到了备份有完全备份,差异备份,事务日志备份和文件组和数据文件备份,恢复有简单恢复,简单恢复,大容量日志恢复。但是这四种备份方式有什么不同呢,有什么各自的用处呢?这三种恢复又需要什么条件呢?这里,我给大家剖析一下:

备份:

1,完全备份:备份内容,包括备份数据库中的所有数据,文件组或数据文件;适用类型:对于小型数据库和中型数据库,完全备份是最常用的技术.缺点:此过程非常耗时,一旦开始备份就不能中途停止.

2,差异备份:备份内容:记录自最后一次去备份以来改变的数据;适用类型:使用于进行过完全备份的数据库;缺点:还原时非常耗时,还原需要还原最后一次完全备份和以后所有的差异备份.

3,事务日志备份:备份内容,备份数据库中已经完成的事务,实现了备份可以真正灵活的时间点恢复;适用类型:数据库处于完全恢复和大容量日志恢复模式;

4,文件组备份:内容,对于与数据库中某个文件有关的所有数据文件的备份.类似于完全备份,但可以是小分支的备份.例如,可以备份一个公司中一个部门或工作组的备份.

5,数据文件备份:内容,只对文件组中的一个文件进行备份,同单独还原一个数据文件的功能协同工作.优点,时间短,可以选择性的备份数据库中的某些文件.

恢复:

1,简单恢复:需要:进行数据库恢复时仅使用数据库备份和差异备份而不涉及事务日志备份。效果:可以恢复到上一次备份的状态,但无法恢复到失败点的状态。

2,完全恢复:需要,采用数据库备份,差异备份和事务日志备份来恢复到失败点的时刻,需要将所有的数据库操作都写入到日志文件中;效果,不造成任何损失。

3,大容量日志备份:需要,和完全备份基本相同;效果,在性能上要优于上边两种方式,它最大努力减少了批操作所需要的存储空间。

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