RE: Corrupt unused blocks in sysaux

  • From: "Kenneth Naim" <kennethnaim@xxxxxxxxx>
  • To: <Jed_Walker@xxxxxxxxxxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
  • Date: Mon, 13 Feb 2012 22:02:40 -0500

Can you move the objects from sysaux to a new tablespace, drop the sysaux
tablespace (have to be sysdba I upgrade mode I believe), and rename the new
one to sysaux? I'd obviously test this process in another non production
environment first.

-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]
On Behalf Of Walker, Jed S
Sent: Monday, February 13, 2012 6:18 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: Corrupt unused blocks in sysaux

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 =
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

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 
SQL> 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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