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	<title>惜分飞 &#187; oracle删除表空间恢复</title>
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		<title>oracle drop tablespace 恢复最后一招</title>
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		<pubDate>Sat, 22 Oct 2022 13:41:45 +0000</pubDate>
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		<category><![CDATA[drop tablespace 恢复]]></category>
		<category><![CDATA[oracle删除表空间恢复]]></category>
		<category><![CDATA[删除表空间恢复]]></category>

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<p>联系：<a href="https://www.xifenfei.com/about_xifenfei" target="_blank">手机/微信(+86 17813235971)   QQ(107644445)</a><a target="_blank" href="http://wpa.qq.com/msgrd?v=3&#038;uin=107644445&#038;site=qq&#038;menu=yes"><img src="https://www.xifenfei.com/wp-content/themes/img/site_qq.jpg" alt="QQ咨询惜分飞" title="QQ咨询惜分飞"/></a></p>
<p>标题：<a href="https://www.xifenfei.com/2022/10/oracle-drop-tablespace-ultimate-recovery.html" target="_blank">oracle drop tablespace 恢复最后一招</a></p>
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<p>客户由于不太熟悉oracle数据库,加入错误的数据文件到一个业务表空间,然后经过一系列操作,最终结果是做了drop tablespace xxx including contents and datafiles操作,导致表空间被删除,而且该数据库未做任何备份和归档.通过检查操作系统和数据库alert日志,确认文件已经从os层面彻底删除<br />
<a href="https://www.xifenfei.com/wp-content/uploads/2022/10/20221022211123.jpg"><img src="https://www.xifenfei.com/wp-content/uploads/2022/10/20221022211123.jpg" alt="20221022211123" width="1002" height="222" class="alignnone size-full wp-image-9971" /></a><br />
<hr />
对于这种情况,如果立即保护现场,然后通过反删除软件进行恢复,运气好还可以恢复出来被删除的数据文件,然后再通过dul之类的工具恢复其中数据,这个客户库一直没有关闭,而且尝试各种工具恢复,解决均没有正常恢复出来被删除的几个数据文件.对于这种情况，正常os层面的方法肯定无法恢复了,尝试使用基于block层面技术进行扫描磁盘恢复,结果发现运气还不错,绝大部分block都被找到,参考类似恢复方法:<a href="https://www.xifenfei.com/2018/05/datafile-size-0k-recovery.html" title="Oracle 数据文件大小为0kb或者文件丢失恢复" rel="noopener" target="_blank">Oracle 数据文件大小为0kb或者文件丢失恢复</a>通过类似分析,找出来绝大多数没有覆盖的block,恢复出来被删除的含数据的file 18,20,21，并通过检测整体恢复效果如下<br />
<a href="https://www.xifenfei.com/wp-content/uploads/2022/10/20221022212822.jpg"><img src="https://www.xifenfei.com/wp-content/uploads/2022/10/20221022212822.jpg" alt="20221022212822" width="1000" height="746" class="alignnone size-full wp-image-9973" /></a><br />
<hr />
通过dul工具结合客户提供的表定语以及获取到大表id信息,相互关联,快速恢复客户绝大多数数据,最大限度挽回客户损失.<br />
<a href="https://www.xifenfei.com/wp-content/uploads/2022/10/20221022213506.jpg"><img src="https://www.xifenfei.com/wp-content/uploads/2022/10/20221022213506.jpg" alt="20221022213506" width="1020" height="746" class="alignnone size-full wp-image-9979" /></a><br />
<hr />
对于oracle 删除表空间之类的操作，我们可以做到block层面深入恢复,理论上只要你被删除的数据文件在磁盘上还有一个block没有被覆盖,我们都可以把里面的数据恢复出来,最大限度的减少因为这种误操作而引起的损失.如果有类似需求无法自行解决,可以联系我们进行最大限度、最快速度的抢救数据.<br />
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