Re: corrupted block

Thanks Kirti. Interesting, dba_extents doesn't return rows for block_id=57856. However, export to /dev/null does report the corruption. Does this indicate disk or memory corruption?

"Deshpande, Kirti" wrote:
>
> 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
> --
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Deshpande, Kirti
> INET: kirti.deshpande_at_verizon.com
>
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Suzy Vordos
  INET: lvordos_at_qwest.com

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