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v$backup_corruption - FRACTURED vs. LOGICAL & Solutions

v$backup_corruption - FRACTURED vs. LOGICAL & Solutions

2005-08-10       - By Christian Antognini

Reply:     1     2     3  

Hi Chris



>What is the meanings for "FRACTURED" & "LOGICAL" values
>in the CORRUPTION_TYPE column of the v$backup_corruption view.



FRACTURED ==> physical corruption



Oracle is not able to read or write a block; if the block can be read, its
content makes no sense.

Usually due to hardware failures.

Typical symptoms:
- ORA-00600 (See ORA-00600.ora-code.com): internal error code
- ORA-01578 (See ORA-01578.ora-code.com): ORACLE data block corrupted



LOGICAL ==> logical corruption



Inconsistency within the data.

Usually due to Oracle bugs.

Typical symptoms:
- ORA-00600 (See ORA-00600.ora-code.com): internal error code
- ORA-01498 (See ORA-01498.ora-code.com): block check failure
- ORA-01499 (See ORA-01499.ora-code.com): table/index cross reference failure



>How could "DBMS_REPAIR" and/or "DBVERIFY" be used to validate
>and fix any corruption we might have.



These two utilities don't fix problems!





Give a look to Metalink note 28814.1. It's a good starting point...







Good luck,

Chris


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<div class=Section1>

<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'>Hi Chris</span></font></p>

<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'>&nbsp;</span></font></p>

<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'>&gt;What is the meanings for &quot;FRACTURED&quot; &amp;
&quot;LOGICAL&quot; values <br>
&gt;in the CORRUPTION_TYPE column of the v$backup_corruption view.</span></font
></p>

<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>&nbsp;</span></font></p>

<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>FRACTURED ==&gt; physical corruption <
/span></font></p>

<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>&nbsp;</span></font></p>

<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>Oracle is not able to read or write a
block; if the block can be read, its content makes no sense.</span></font></p>

<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>Usually due to hardware failures.</span><
/font></p>

<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>Typical symptoms:<br>
- ORA-00600 (See ORA-00600.ora-code.com): internal error code<br>
- ORA-01578 (See ORA-01578.ora-code.com): ORACLE data block corrupted</span></font></p>

<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>&nbsp;</span></font></p>

<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>LOGICAL ==&gt; logical corruption</span><
/font></p>

<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>&nbsp;</span></font></p>

<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>Inconsistency within the data.</span><
/font></p>

<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>Usually due to Oracle bugs.</span></font><
/p>

<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>Typical symptoms:<br>
- ORA-00600 (See ORA-00600.ora-code.com): internal error code<br>
- ORA-01498 (See ORA-01498.ora-code.com): block check failure<br>
- ORA-01499 (See ORA-01499.ora-code.com): table/index cross reference failure</span></font></p>

<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>&nbsp;</span></font></p>

<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'>&gt;How could &quot;DBMS_REPAIR&quot; and/or &quot;DBVERIFY&quot; be
used to validate <br>
&gt;and fix any corruption we might have.</span></font></p>

<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>&nbsp;</span></font></p>

<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>These two utilities don&#8217;t fix
problems! </span></font></p>

<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>&nbsp;</span></font></p>

<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>&nbsp;</span></font></p>

<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>Give a look to Metalink note 28814.1. It&
#8217;s
a good starting point...</span></font></p>

<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'>&nbsp;</span></font></p>

<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>&nbsp;</span></font></p>

<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>&nbsp;</span></font></p>

<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>Good luck,</span></font></p>

<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>Chris</span></font></p>

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