Corrupt unused blocks in sysaux

From: Walker, Jed S <Jed_Walker_at_cable.comcast.com>
Date: Mon, 13 Feb 2012 23:18:13 +0000
Message-ID: <BAA6E28B6241F046AED1E62D8697516C562C39BA_at_COPDCEXMB08.cable.comcast.com>

Someone just brought me to a system that recently had an outage. A disk had gone bad and been replaced (supposedly RAID1). The database was restarted and appears to be working normally; however, there are some corrupt blocks. I first saw this in the alert log and then verified with dbv. So, now I have corrupt blocks in SYSAUX that are not used by an object. Unfortunately there are no RMAN backups as it appears they use streams to replicate to another database.

I tried creating an object in the sysaux tables so I could allocate extents to encompass the blocks and then insert rows hoping to reformat them; however, when I tried to allocate over the blocks I get a corruption message. I'm thinking these are corrupt on disk.

I re-found dbms_repair but the options for marking blocks corrupt seem to be if the blocks are in an object, not free.

Any ideas on what else I can do? I'd really like to just mark off the blocks and be done with it. (This project is hopefully obsolete later this year).

DBVERIFY - Verification starting : FILE = /var/local/u01/app/oracle/oradata/orcl/sysaux.dbf Page 8450 is influx - most likely media corrupt Page 8451 is marked corrupt
Page 8452 is marked corrupt
Page 8453 is marked corrupt
Page 8454 is marked corrupt

select segment_name, segment_type, owner from dba_extents
where file_id = 3
and (
8451 between block_id and block_id + blocks -1 or
8452 between block_id and block_id + blocks -1 or
8453 between block_id and block_id + blocks -1 or
8454 between block_id and block_id + blocks -1 )
/

no rows selected

connect jed/*

SQL> create table remcorr (n number, c varchar2(4000)) nologging tablespace sysaux;

Table created.

SQL> alter table remcorr allocate extent;

Table altered.

SQL> alter table remcorr allocate extent (size 200m); alter table remcorr allocate extent (size 200m) *
ERROR at line 1:
ORA-01578: ORACLE data block corrupted (file # 3, block # 8451) ORA-01110: data file 3: '/var/local/u01/app/oracle/oradata/orcl/sysaux.dbf'

Jed S. Walker, OCP
Principal Engineer, Databases
National Video Advanced Services
Office: 303.267.6759
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Received on Mon Feb 13 2012 - 17:18:13 CST