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浅谈Oracle非常规恢复

Jun 07, 2016 pm 04:36 PM
oracle Archive recover

一直以来,类似非归档无备份的数据库损坏,或者备份不可用,或者用备份恢复因为时间太长或者空间限制等等原因制约,非常规恢复一直是我们不能扔掉的救命稻草,在这个方面我并不擅长,但是一直都很喜欢。 记得2001年前后,我第一次有兴趣想要认真学习一下Orac

一直以来,类似非归档无备份的数据库损坏,或者备份不可用,或者用备份恢复因为时间太长或者空间限制等等原因制约,非常规恢复一直是我们不能扔掉的救命稻草,在这个方面我并不擅长,但是一直都很喜欢。


记得2001年前后,我第一次有兴趣想要认真学习一下Oracle(以前做开发相关比较多,菜鸟dba),在还没有了解Oracle备份恢复的机制时,忘记为什么首先接触了Oracle 817的Standby,一周内完整的读了一遍文档,动手搭建了两个,并记录在ITPUB和我自己的blog上,很有成就感,而那时,我还没有意识到,其实Standby 的本质就是数据库的备份和恢复的完美结合。

后来有机会作为dba参加一个公司(在当时没觉得公司小,但是只有我一个菜鸟dba,O(∩_∩)O哈哈~)的一个海外项目,是做一个3节点Oracle 817 OPS 克隆数据库的事情,当时我还不熟悉RMAN,使用dd裸设备的方式完成了任务。这个项目之后,我开始迷上Oracle的备份和恢复,并且开始玩rman了。


迄今为止,我还是认为数据库备份恢复是学习Oracle的最佳入口,因为很多时候你可以方便的模拟场景,并研究恢复,在一个个案例中,学习和了解更多internal的原理。当然,任何时候官方文档都是第一步,没有这个基础,很多都如同空中楼阁。


还有一点,一个好的架构设计、备份恢复策略和灾备设计都是最好的选择,这个是毋庸置疑的。


但是中国大量D版客户,尤其是小客户中太多情况下是没有专业的设计,出了问题,非常规恢复的手段就是救命稻草了。
下面的ppt就是去年一个客户在备份不可用的情况下,花“巨资”请人做了非常规恢复后,找我们去做的一次交流,客户要求的主题就是“非常规恢复”:
浅谈Oracle非常规恢复-lunar
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