RE: Block corruption again

  • From: "Taylor, Chris David" <ChrisDavid.Taylor@xxxxxxxxxxxxxxx>
  • To: "'howard.latham@xxxxxxxxx'" <howard.latham@xxxxxxxxx>, "'Jiang, Lu'" <Lu.Jiang@xxxxxxxxxxxx>, "'oracle-l@xxxxxxxxxxxxx'" <oracle-l@xxxxxxxxxxxxx>
  • Date: Thu, 29 Dec 2011 07:31:28 -0600

Seems to me if this was a hardware problem, and all the datafiles are on the 
same LUN, then block corruptions would be occurring in more than 1 file.

Being that this is an index datafile, I would assume that it only contains 
index segments so it might be worthwhile tracking down which index contains the 
corrupted block.

What version of Oracle are you running, and is there anything special about 
this database (Dataguard configuration etc etc)?

Chris Taylor
Sr. Oracle DBA
Ingram Barge Company
Nashville, TN 37205

"Quality is never an accident; it is always the result of intelligent effort."
-- John Ruskin (English Writer 1819-1900)

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-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On 
Behalf Of Howard Latham
Sent: Wednesday, December 28, 2011 1:52 PM
To: Jiang, Lu; oracle-l@xxxxxxxxxxxxx
Subject: RE: Block corruption again

Check and replace hardware

Sent from my Windows Phone
From: Jiang, Lu
Sent: 28/12/2011 19:46
To: oracle-l@xxxxxxxxxxxxx
Subject: Block corruption again
Hi all,
I just got a corrupt block again, had fixed a block corruption in a same index 
file two weeks ago. Don't know why this happened twice in such a sort period.

I tried rman validate and dbverify to detect the corruption, but  rman validate 
did not report any data corruption while dbverify did.

Could anyone shed any light on this?


The following is the output from rman validate and dbverify.

Using backup validate:

RMAN> backup check logical validate datafile
Starting backup at 28-DEC-11
using channel ORA_DISK_1
channel ORA_DISK_1: starting full datafile backupset channel ORA_DISK_1: 
specifying datafile(s) in backupset input datafile fnochannel ORA_DISK_1: 
backup set complete, elapsed
time: 00:00:25
Finished backup at 28-DEC-11

Using dbverify:

block relative dba: 0x06426321 (file 25, block 156449) Bad check value found 
during dbv:
DBVERIFY - Verification complete
Total Pages Examined         : 393216
Total Pages Processed (Data) : 2782
Total Pages Failing   (Data) : 0
Total Pages Processed (Index): 93966
Total Pages Failing   (Index): 0
Total Pages Processed (Other): 19301
Total Pages Processed (Seg)  : 0
Total Pages Failing   (Seg)  : 0
Total Pages Empty            : 277166
Total Pages Marked Corrupt   : 1
Total Pages Influx           : 0
Highest block SCN            : 1326171528 (0.1326171528)

Looks rman validate did not ddetect any data corruption while dbverify did.



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