Oracle-L: RE: corrupted block

From: Deshpande, Kirti <kirti.deshpande_at_verizon.com>
Date: Mon, 24 Feb 2003 09:19:04 -0800
Message-ID: <F001.00556E2E.20030224091904@fatcity.com>

Suzy,
Just more questions:
Are your sure that this corruption has made it to the disk? It could be memory related. Can you export the table to /dev/null to double check the corruption? What do you get when reading that particular block using dba_extents?

Kirti

-----Original Message-----
Sent: Monday, February 24, 2003 10:09 AM To: Multiple recipients of list ORACLE-L

I recently inherited a 40GB 7.3.4 database (yes, it needs to upgrade). Last night I analyzed the tables and a corrupted block was found. I know which table and datafile it is, and it's the only table in the affected tablespace.

The database is in archivelog mode so I can recover the datafile, but I am not certain when the block corruption occurred. There were no proactive measures in place to quickly report a corrupted block. So I assume it may have been there a long time, and was just found through analyze (tables hadn't been analyzed since Dec-2000).

So my question is, if all backups contain the corrupted block, how would I copy all non-corrupted blocks from this table into a new table?

Here is the trace file:

ORACLE data block corrupted (file # 24, block # 57856)

Dump file
/dbms/ora00/app/oracle/admin/kana03aP/udump/kana03ap_ora_13163.trc Oracle7 Server Release 7.3.4.3.0 - Production With the distributed, replication, parallel query and Spatial Data options
PL/SQL Release 2.3.4.3.0 - Production
ORACLE_HOME = /dbms/ora00/app/oracle/product/7.3.4

System name:	SunOS
Node name:	kanadb-co1
Release:	5.6
Version:	Generic_105181-17
Machine:	sun4u

Instance name: kana03aP
Redo thread mounted by this instance: 1
Oracle process number: 10
Unix process pid: 13163, image: oraclekana03aP

2003.02.24.02.49.42.000
SESSION ID:(24.1317) 2003.02.24.02.49.41.000 *** Corrupt block dba: 0x6000e200 file=24. blocknum=57856. found during buffer read on disk type:0. ver:0. dba: 0x00000000 inc:0x00000000 seq:0x00000000 incseq:0x00000000 Entire contents of block is zero - block never written Reread of block=6000e200 file=24. blocknum=57856. found same corupted data
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Author: Deshpande, Kirti
INET: kirti.deshpande_at_verizon.com

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