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	<title>惜分飞 &#187; 数据文件重组</title>
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		<title>alter database create datafile 导致数据文件丢失恢复</title>
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		<pubDate>Mon, 17 Oct 2016 15:26:07 +0000</pubDate>
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				<category><![CDATA[非常规恢复]]></category>
		<category><![CDATA[create datafile 恢复]]></category>
		<category><![CDATA[数据文件重组]]></category>
		<category><![CDATA[文件丢失恢复]]></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/2016/10/alter-database-create-datafile-recovery.html" target="_blank">alter database create datafile 导致数据文件丢失恢复</a></p>
<p>作者：<a href="https://www.xifenfei.com" target="_blank">惜分飞</a>©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]</p>
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<p><strong>alter database create datafile导致原始数据文件丢失</strong><br />
有客户一个小系统找我们恢复，通过<a href="//www.xifenfei.com/oracle_recovery_check" title="Oracle Database Recovery Check" target="_blank">Oracle Database Recovery Check</a> 检测之后我们红框部分发现一奇怪现象<br />
<img src="//www.xifenfei.com/wp-content/uploads/2016/10/ctl.jpg" alt="ctl" width="1413" height="141" class="alignleft size-full wp-image-6644" /><br />
<img src="//www.xifenfei.com/wp-content/uploads/2016/10/create-datafile-ctl.jpg" alt="create-datafile-ctl" width="1412" height="197" class="alignleft size-full wp-image-6645" /><br />
<img src="//www.xifenfei.com/wp-content/uploads/2016/10/create-datafile.jpg" alt="create-datafile" width="1411" height="281" class="alignleft size-full wp-image-6646" /></p>
<hr />
1.文件头fuzzy为NO,不符合数据库异常crash常识,也和其他文件该状态不匹配<br />
2.文件的创建时间，scn均和checkpoint时间,scn一致(也就是说该文件是创建之后就checkpoint,然后就没有其他操作)<br />
3.文件开始应用的归档为5,110和其他数据文件要求的3115相差甚远<br />
结合这些情况,怀疑该文件被重新创建,查找alert日志果如发现如下信息</p>
<pre class="brush: bash; title: ; notranslate">
两个文件通过create datafile创建之后,然后offline操作.通过alert日志核查file 6和8的创建时间和seq信息
1
Fri Jan 16 15:03:36 2015
Thread 1 advanced to log sequence 5 (LGWR switch)
  Current log# 2 seq# 5 mem# 0: D:\APP\ADMINISTRATOR\ORADATA\MYCHOICE\REDO02.LOG
Fri Jan 16 15:13:19 2015
CREATE BIGFILE TABLESPACE &quot;FBAUDIT&quot;
DATAFILE 'E:\ZDSoft\ZDFood\databak\FBAUDIT' SIZE 10M
AUTOEXTEND ON NEXT 10M
MAXSIZE UNLIMITED LOGGING EXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO
Completed: CREATE BIGFILE TABLESPACE &quot;FBAUDIT&quot;
DATAFILE 'E:\ZDSoft\ZDFood\databak\FBAUDIT' SIZE 10M
AUTOEXTEND ON NEXT 10M
MAXSIZE UNLIMITED LOGGING EXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO

Sat Feb 07 15:03:46 2015
Thread 1 advanced to log sequence 110 (LGWR switch)
  Current log# 2 seq# 110 mem# 0: D:\APP\ADMINISTRATOR\ORADATA\MYCHOICE\REDO02.LOG
Sat Feb 07 15:20:41 2015
CREATE BIGFILE TABLESPACE &quot;CARD&quot;
DATAFILE 'E:\ZDSoft\ZDCARD\databak\CARD1' SIZE 10M
AUTOEXTEND ON NEXT 10M
MAXSIZE UNLIMITED LOGGING EXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO
Completed: CREATE BIGFILE TABLESPACE &quot;CARD&quot;
DATAFILE 'E:\ZDSoft\ZDCARD\databak\CARD1' SIZE 10M
AUTOEXTEND ON NEXT 10M
MAXSIZE UNLIMITED LOGGING EXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO
</pre>
<p>通过结合alert日志判断，我们可以确定，当前我们Oracle Database Recovery Check检查出来的情况,是由于执行了create datafile命令导致故障前的文件丢失,创建了一个新的数据文件,而由于该库为非归档模式,导致该文件数据无法恢复(备注:不光是非归档模式不行,就算是归档模式,也需要从文件创建到现在的所有归档才行).在大部分生产系统,我相信不可能有这么的归档,因为在执行alter database create datafile命令之时一定要慎重,评估确定是否丢失归档,否则可能导致不可理的损坏).<br />
客户意识到了悲剧的发生,但是希望我们帮忙恢复一张核心数据,用户的余额信息.<br />
<br />
<strong>对于alter database create datafile丢失文件恢复</strong><br />
通过工具扫描原始文件相关的记录(由于写入大量数据,无法完整恢复,只能通过工具扫描,恢复部分数据)[<a href="//www.xifenfei.com/2014/04/asm-disk-header-%e5%bd%bb%e5%ba%95%e6%8d%9f%e5%9d%8f%e6%81%a2%e5%a4%8d.html" title="asm disk header 彻底损坏恢复" target="_blank">asm disk header 彻底损坏恢复</a>]<br />
<img src="//www.xifenfei.com/wp-content/uploads/2016/10/scan-datafile.jpg" alt="scan-datafile" width="617" height="649" class="alignleft size-full wp-image-6647" /><br />
<hr />
因为原库虽然丢失了这两个文件,但是已经open成功,通过相关的data obj结合这个里面扫描到的文件,抽取出来需要的对象的block,然后对block里面的数据进行读取恢复出来相关数据.在这里我们还有一个难点就是由于这两个文件都是bigfile,给恢复过程增加了难度<br />
<img src="//www.xifenfei.com/wp-content/uploads/2016/10/recover-data.png" alt="recover-data" width="749" height="423" class="alignleft size-full wp-image-6648" /><br />
<hr />
至此我们已经实现了对于alter database create datafile导致文件丢失的核心数据的恢复.尽可能的减小的客户的损坏.这种恢复是取决运气,数据在磁盘上的block没有被覆盖.如果覆盖了基本无望.<br />
<em>如果需要数据库恢复,请联系我们(<a href="//www.xifenfei.com/oracle_recover" title="ORACLE数据库恢复技术支持" target="_blank">ORACLE数据库恢复技术支持</a>),将为您提供专业数据库技术支持：</em><br />
<strong><font color="red" size=4>Phone:17813235971  &nbsp;&nbsp;   Q Q:107644445  &nbsp;&nbsp;  E-Mail:dba@xifenfei.com</font></strong><br />
<strong>再次提醒</strong><br />
1.在数据库出现故障之时,尽可能保护现场,做操作之前要之后后果别百度了就不分青红皂白的直接操作,导致不可逆的破坏,数据可能永久性丢失[<a href="//www.xifenfei.com/2015/05/oracle%e5%bc%82%e5%b8%b8%e6%81%a2%e5%a4%8d%e5%89%8d%e5%a4%87%e4%bb%bd%e4%bf%9d%e6%8a%a4%e7%8e%b0%e5%9c%ba%e5%bb%ba%e8%ae%ae.html" title="Oracle异常恢复前备份保护现场建议—FileSystem环境" target="_blank">Oracle异常恢复前备份保护现场建议—FileSystem环境</a>|<a href="//www.xifenfei.com/2015/05/oracle%e5%bc%82%e5%b8%b8%e6%81%a2%e5%a4%8d%e5%89%8d%e5%a4%87%e4%bb%bd%e4%bf%9d%e6%8a%a4%e7%8e%b0%e5%9c%ba%e5%bb%ba%e8%ae%ae.html" title="Oracle异常恢复前备份保护现场建议—FileSystem环境" target="_blank">Oracle异常恢复前备份保护现场建议—ASM环境</a><br />
2.使用alter database create datafile命令之前需要慎重,评估是否所有的归档都存在</p>
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		<title>dul无法加载bootstrap实现unload table/user恢复</title>
		<link>https://www.xifenfei.com/2016/09/dul-bootstrap-error-unload-table.html</link>
		<comments>https://www.xifenfei.com/2016/09/dul-bootstrap-error-unload-table.html#comments</comments>
		<pubDate>Wed, 28 Sep 2016 11:17:02 +0000</pubDate>
		<dc:creator><![CDATA[惜分飞]]></dc:creator>
				<category><![CDATA[非常规恢复]]></category>
		<category><![CDATA[dul bootstrap]]></category>
		<category><![CDATA[DUL: Error: No compatibility segments found]]></category>
		<category><![CDATA[system 删除恢复]]></category>
		<category><![CDATA[数据文件重组]]></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/2016/09/dul-bootstrap-error-unload-table.html" target="_blank">dul无法加载bootstrap实现unload table/user恢复</a></p>
<p>作者：<a href="https://www.xifenfei.com" target="_blank">惜分飞</a>©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]</p>
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<p>最近有朋友误操作引起了非常大的事故,差点吃了官司.在做数据库迁移的时候,远程误操作删除了原库的system等几个数据库初始安装的文件,而且该磁盘空间使用率非常高,还有少量写入.最后结果比较悲剧,通过文件系统层面无法直接恢复出来数据文件,而且该库无任何有效备份,又没有表名,列名等信息,无奈之下只能通过底层io block重组来恢复数据文件,可是悲剧又一次发生,这个磁盘上以前也有一份system等文件,最后经过多方重组恢复出来一份相对理想的数据文件.但是第三方公司通过这样重组出来的数据文件和未被删除的业务文件恢复出来的数据大量有问题，依旧需要我们进一步分析恢复处理.这篇文章主要描述了dul在无法加载bootstrap命令之后通过一些方法依旧可以正常使用unload table/user 等命令实现数据尽可能恢复.你要知道几百张表没有表名/列名要把他们区分出来那是什么样的工作量……<br />
<strong>在dul中配置system文件</strong></p>
<pre class="brush: bash; title: ; notranslate">
D:\xifenfei\system01.dbf

D:\TEMP\recover\dul\bak&gt;dul

Data UnLoader: 11.2.0.0.4 - Internal Only - on Wed Sep 28 17:01:56 2016
with 64-bit io functions

Copyright (c) 1994 2016 Bernard van Duijnen All rights reserved.

 Strictly Oracle Internal Use Only


DUL&gt; show datafiles;
Sorry, no valid data files found in control.txt
</pre>
<p>使用默认的dul中数据文件配置方法，让dul自己发现数据文件方法不可行<br />
<br />
<strong>随意表空间号和文件号dul识别</strong></p>
<pre class="brush: bash; title: ; notranslate">
0 0 D:\xifenfei\system01.dbf

D:\TEMP\recover\dul\bak&gt;dul

Data UnLoader: 11.2.0.0.4 - Internal Only - on Wed Sep 28 17:00:27 2016
with 64-bit io functions

Copyright (c) 1994 2016 Bernard van Duijnen All rights reserved.

 Strictly Oracle Internal Use Only



DUL: Warning: File Type mismatch 1 != 8
DUL: Warning: D:\xifenfei\system01.dbf Header tablespace number 3
!= 0
DUL: Warning: D:\xifenfei\system01.dbf Header relative file number 1 != 0
Found db_id = 2948357999
Found db_name = XIFENFEI
DUL: Warning: Found mismatch while checking file D:\xifenfei\system01.dbf
DUL: Warning: DUL osd_parameter or control.dul configuration error
DUL: Warning: Given file number(0) in control file does not match file# in dba(1)
</pre>
<p>通过这个识别我们可以知道system的表空间号为3,文件号为1<br />
<br />
<strong>再次配置system让dul识别</strong></p>
<pre class="brush: bash; title: ; notranslate">
3 1 D:\xifenfei\system01.dbf
D:\TEMP\recover\dul\bak&gt;dul

Data UnLoader: 11.2.0.0.4 - Internal Only - on Wed Sep 28 17:03:46 2016
with 64-bit io functions

Copyright (c) 1994 2016 Bernard van Duijnen All rights reserved.

 Strictly Oracle Internal Use Only



DUL: Warning: File Type mismatch 1 != 8
Found db_id = 2948357999
Found db_name = XIFENFEI
DUL&gt; show datafiles;
ts# rf# start   blocks offs open  err file name
  3   1     0   320257    0    1    0 D:\xifenfei\system01.dbf
</pre>
<p>dul正常识别出来system文件但是根据经验我们知道tablespace 3肯定是有问题的，因此后续操作依旧问题非常多<br />
<br />
<strong>尝试dul bootstrap恢复失败</strong></p>
<pre class="brush: bash; title: ; notranslate">
DUL&gt; bootstrap;
Scanning SYSTEM tablespace to locate compatibility segment ...
DUL: Warning: No files found for tablespace 0
Reading EXT.dat 0 entries loaded and sorted 0 entries
Reading SEG.dat 0 entries loaded
Reading COMPATSEG.dat 0 entries loaded
Reading SCANNEDLOBPAGE.dat 0 entries loaded and sorted 0 entries
DUL: Error: No compatibility segments found
</pre>
<p>由于表空间号错误,dul无法加载到bootstrap$表,另外根据bbed分析恢复出来的system文件中bootstrap$这部分丢失<br />
<br />
<strong>尝试人工加载dul所需数据字典</strong></p>
<pre class="brush: bash; title: ; notranslate">
DUL&gt; unload table OBJ$ 
  2     storage ( tablespace 3 segobjno 18 file 1 block 240);
. unloading table                      OBJ$   79074 rows unloaded

DUL&gt; unload table TAB$( OBJ# number, DATAOBJ# number,
  2      cluster  C_OBJ#(OBJ#)
  3      storage ( tablespace 3 segobjno 2 tabno 1 file 1 block 144);
. unloading table                      TAB$    4482 rows unloaded

DUL&gt; unload table COL$ ( OBJ# number, COL# number , SEGCOL# number,
  2      cluster C_OBJ#(OBJ#)
  3      storage ( tablespace 3 segobjno 2 tabno 5 file 1 block 144);
. unloading table                      COL$  114491 rows unloaded

DUL&gt; unload table USER$
  2      cluster C_USER#(USER#)
  3      storage ( tablespace 3 segobjno 10 tabno 1 file 1 block 208);
. unloading table                     USER$      96 rows unloaded

----其他表省略,根据需要的依次处理
</pre>
<p><strong>尝试使用dul恢复数据</strong></p>
<pre class="brush: bash; title: ; notranslate">
DUL&gt; desc portal_emr.BASEELEMENT;
Table PORTAL_EMR.BASEELEMENT
obj#= 87200, dataobj#= 87200, ts#= 9, file#= 7, block#=458
      tab#= 0, segcols= 8, clucols= 0
Column information:
icol# 01 segcol# 01       BENAME len   30 type  1 VARCHAR2 cs 852(ZHS16GBK)
icol# 02 segcol# 02     TYPENAME len   30 type  1 VARCHAR2 cs 852(ZHS16GBK)
icol# 03 segcol# 03     TYPETYPE len   22 type  2 NUMBER(0,0)
icol# 04 segcol# 04    BEXMLTEXT len 4000 type  1 VARCHAR2 cs 852(ZHS16GBK)
icol# 05 segcol# 05 DEPTGROUPCODE len   30 type  1 VARCHAR2 cs 852(ZHS16GBK)
icol# 06 segcol# 06     ISCOMMON len   22 type  2 NUMBER(0,0)
icol# 07 segcol# 07      BESPELL len   15 type  1 VARCHAR2 cs 852(ZHS16GBK)
icol# 08 segcol# 08     ELEMTYPE len   22 type  2 NUMBER(0)

DUL&gt; show datafiles;
ts# rf# start   blocks offs open  err file name
  3   1     0   320257    0    1    0 D:\xifenfei\system01.dbf
  9   7     0  4170425    0    1    0 D:\BaiduYunDownload\PORTAL_EMR

DUL&gt; unload table portal_emr.BASEELEMENT;
. unloading table               BASEELEMENT    1913 rows unloaded
</pre>
<p>这里描述了在dul无法加载bootstrap命令之后,通过人工加载数据字典实现正常的unload table/user功能,丢弃了一般处理思路中的只能通过scan 然后unload没有表名,列名的处理方法,从而实现了恢复的最大化.<br />
我们对原厂官方oracle dual工具有深入研究,如果在oracle dul恢复方面有搞不定的问题.<br />
请联系我们,提供专业<a title="ORACLE数据库恢复技术支持" href="//www.xifenfei.com/oracle_recover" target="_blank">ORACLE数据库恢复技术支持</a><br />
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