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RE: Help - Corrupted Block - Lob Segment - NOLOGGING

Wolfson Larry - lwolfs

2006-10-23

Replies:
Sam,
 What release is this?

Here's a terrific presentation about LOBS from Tanel Poder.
http://integrid.info/Poder_LOB_Internals.pdf take a look at this.

Did OS say you could drop RIDs in that block, and if so, how will that
effect your app?

 Larry

-----Original Message-----
From: oracle-l-bounce@(protected)
[mailto:oracle-l-bounce@(protected)
Sent: Monday, October 23, 2006 1:47 PM
To: oracle-l@(protected)
Subject: Help - Corrupted Block - Lob Segment - NOLOGGING

Our third-party version control software uses an Oracle database as its
repository.

Documents are stored in a BLOB column in an Oracle table. It is NOT
stored "in_row" and logging is turned off (for performance reasons they
told me).

We recently encountered a bad block, and I have since determined there
are additional bad blocks, but it is just one block that is continually
giving us a problem.

When a user attempts to check an object into the repository, they often
get the error message:

E03020003: Database Error: [CAI/PT][ODBC Oracle 8
driver][Oracle]ORA-01578: ORACLE data block corrupted (file # 31, block
# 123533)
ORA-01110: data file 31: '/san1/oradata/PROD/harvestblob01.dbf'
ORA-26040: Data block was loaded using the NOLOGGING option

This tells me the block still has free space to insert new data; i.e.,
the block is on the free list.

Here is some information about the tablespace housing this lob segment
(from dba_tablespaces):
Force_logging="N'
Extent_management='LOCAL'
Allocation type='system'
Segment_space_management='auto'

Can somebody tell me what I need to do to allow users to continue to
check items into this repository without receiving the error message and
with minimal data loss; i.e., limiting data loss to the content of
corrupted block# 123533. I think I can do this if I am able to
permanently get this block off the free list, but how can I do that?

I have contacted Oracle Support, but they have been of limited
assistance. They had me review metalink note 293515.1 "ORA-1578
ORA-26040 in a LOB segment - Script to solve the errors". But this has
not helped our situation. The metalink note directs us to create a
table with a single column of type rowid. Then run an Oracle procedure
to populate this table with rowids for rows in the corrupted block.
After this we set concat to "#", then update the lob column to
"empty_blob". I did this and commited, but users receive the same error
message.

Thanks for any and all suggestions.

Sam Bootsma
Oracle Database Administrator
Information Technology Services
George Brown College
Phone: 416-415-5000 x4933
Fax: 416-415-4836
E-mail: sbootsma@(protected)

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