PRM 一个Oracle数据库灾难恢复救护车工具
PRM可以基于损坏的文件系统、ASM Diskgroup和数据文件工作；如果Oracle数据字典可用，那么它会使用Dictionary来使得恢复变得更简
在真实世界中相信不少朋友遇到过数据库或者文件系统损坏，突然间珍贵的数据无法访问了，这对于以数据为根本的企业来说太致命了。 在大多数场景中标准的基于RMAN的恢复流程都可以解决此类问题。
在少数场景中常规的恢复手段可能会失败，造成失败的原因往往是备份不可用或者丢失归档或者硬件损坏，这种场景下最终留下的是一堆不一致的数据文件，和无法使用的数据库。 但很多人没有意识到显然数据库或者文件系统中的内容并没有被彻底清空，可能只是无法打开数据库，，但绝大多数数据仍是完好的。PRM是这样一个工具，它可以直接读取数据文件中尚完好的数据，而不需要运行Oracle Instance数据库实例；只要数据没有被彻底清空或破坏，那么PRM就还有将数据拯救出来的希望。
PRM可以基于损坏的文件系统、ASM Diskgroup和数据文件工作；如果Oracle数据字典可用，那么它会使用Dictionary来使得恢复变得更简单，即便这个字典来源于以前不一致的SYSTEM.DBF系统表空间的备份的。对于PRM而言大多数Oracle特性都被支持，例如Cluster、LOB、分区表等等。
下载PRM及其文档
PRM是开放的Oracle数据库灾难恢复软件，诗檀软件开发了PRM并获得了独立的软件著作权。
任何人均可以从 上下载到最新版的PRM社区版， 社区版存在每张表只能拯救一万行数据的限制。
最新的PRM版本是3.0，下载地址 ：
从3.0开始 PRM软件包中自带有使用指导文档，获取更多技术文档资源可以登录：
问题或PRM使用求助？
不清楚使用细节？存在问题？ 或者你发现了PRM的bug ? 或者你认为使用PRM后并没有恢复所有的数据？
存在这些问题时，你可以到这些地方获得帮助：
论坛： 关于PRM的问题可以到 专版去讨论
邮件： 可以发邮件给 report_bugs@parnassusdata.com 或者 service@parnassusdata.com
PRM的主要特性
限制
虽然PRM 已经支持众多特性了，但是Oracle技术日新月异，所以仍存在以下的限制：
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