RE: Corrupt unused blocks in sysaux
- From: "Walker, Jed S" <Jed_Walker@xxxxxxxxxxxxxxxxx>
- To: "oracle-l@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 17 Feb 2012 06:28:06 +0000
I had to use "set maxcorrupt" to get the backup to work, but since they are
unused blocks it should not matter. I am probably going to do the work next
week. I'll update afterwards - hopefully with good news.
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Walker, Jed S
Sent: Tuesday, February 14, 2012 7:47 AM
To: Niall Litchfield
Cc: oracle-l@xxxxxxxxxxxxx
Subject: RE: Corrupt unused blocks in sysaux
Thanks for all the tips. My example below was using note 336133.1. That is why
I was asking here, the note isn't working.
I had considered exporting everything in SYSAUX and recreating but given what
SYSAUX is I found that worrisome.
Niall: That is a great idea. I had used "backup validate" to see if it would
report the issue and it didn't. Obviously because it didn't look at the unused
blocks. So, yes, theoretically if I could back up the SYSAUX table, and then
restore/recover it from the backup I can probably eliminate the problem.
From: Niall Litchfield [mailto:niall.litchfield@xxxxxxxxx]
Sent: Tuesday, February 14, 2012 12:53 AM
To: Walker, Jed S
Cc: oracle-l@xxxxxxxxxxxxx
Subject: Re: Corrupt unused blocks in sysaux
Jed,
I'm afraid I think you'll end up recreating the database (either via
export/import or by reversing streams) See Note 950128.1. Most but not all of
SYSAUX is moveable.
Couple of wilder ideas.
* Try backing up the datafile with RMAN (it shouldn't write the empty
blocks but I'd expect it to fail reading them)
* Try shutting down the db and physically moving the file to a different
device (should tell you if the file is physically corrupt), you could then do a
rename.
The 'correct' thing to do is covered in the note though :(
On Mon, Feb 13, 2012 at 11:18 PM, Walker, Jed S
<Jed_Walker@xxxxxxxxxxxxxxxxx<mailto:Jed_Walker@xxxxxxxxxxxxxxxxx>> wrote:
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
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<tel:303.267.6759>
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Thank You
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Niall Litchfield
Oracle DBA
http://www.orawin.info
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