RE: Block corruption again

Thanks Jon. Actually I had already given sysadmin a list of Oracle files which 
should be excluded from anti-virus scan.  


-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On 
Behalf Of CRISLER, JON A
Sent: Friday, December 30, 2011 1:32 AM
To: Lu.Jiang@xxxxxxxxxxxx; 'oracle-l@xxxxxxxxxxxxx'
Subject: RE: Block corruption again

Generally you want any anti-virus package to not perform any "on-demand" 
scanning of Oracle disk objects.  Besides being a frequent performance 
bottleneck, it can cause errors as you have encountered.  They can also cause 
some very interesting issues with Oracle RAC.

-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On 
Behalf Of Jiang, Lu
Sent: Thursday, December 29, 2011 4:09 PM
To: 'oracle-l@xxxxxxxxxxxxx'
Subject: RE: Block corruption again

Thanks all for your replies.
I had fixed this block corruption last night. Asked sysadmin to make sure no OS 
level activities against the data files except image backup. Now anti-Virus has 
been changed to not to scan on data files. I will keep an eye on this and wish 
the issue won't happen again. Really hope it is not a hardware issue.
Oracle version is 10gR2 with Data Guard, there is no failover/switchover 
performed recently. The issue seems occurred after rebooting the database 
machine. 


-----Original Message-----
From: CRISLER, JON A [mailto:JC1706@xxxxxxx] 
Sent: Thursday, December 29, 2011 2:58 PM
To: ChrisDavid.Taylor@xxxxxxxxxxxxxxx; 'howard.latham@xxxxxxxxx'; 'Jiang, Lu'; 
'oracle-l@xxxxxxxxxxxxx'
Subject: RE: Block corruption again

On what Chris is saying- there is a known problem on 11gR1 where objects can 
get corrupted if you are in a Data Guard environment, and do a switchover and 
then switchback.  Generally it seems to affect indexes, and it will also cause 
ORA-01555 errors.  Rebuilding the index solves the problem until you put in a 
patch.
You should also look into putting in the parameters to enforce a more strict 
level of block checking.

-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On 
Behalf Of Taylor, Chris David
Sent: Thursday, December 29, 2011 8:31 AM
To: 'howard.latham@xxxxxxxxx'; 'Jiang, Lu'; 'oracle-l@xxxxxxxxxxxxx'
Subject: RE: Block corruption again

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?

Thanks,
Lu


The following is the output from rman validate and dbverify.

Using backup validate:

RMAN> backup check logical validate datafile
'F:\ORACLE\ERPPROD\DB\APPS_ST\DATA\A_TXN_IND01.DBF';
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:

dbv FILE=F:\ORACLE\ERPPROD\DB\APPS_ST\DATA\A_TXN_IND01.DBF FEEDBACK0 Corrupt 
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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