RE: Possibility of changing Rowid because of UPDATE operations

From: Justin Cave (DDBC) <jcave_at_ddbcinc.com>
Date: Tue, 16 Mar 2004 13:03:15 -0700
Message-ID: <87E9F113CEF1D211A4C3009027301874195D82@ddbcinc.ddbc.local>

The ROWID is certainly liable to change due to an UPDATE of an IOT. I can't think of a reason Oracle would change the ROWID of a row in a normal table because of an UPDATE, but Oracle certainly does not guarantee such a thing. It's always possible that some new feature will come along and cause ROWID's to change because of an update-- I would avoid designing a system that depended on hoping that didn't happen.

Have you looked into Oracle Change Data Capture (CDC)? It sounds like that's what you're after here. If so, it's a lot easier to use Oracle built-in functionality that to write it yourself.

Justin Cave
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

-----Original Message-----

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Prasada.Gunda_at_hartfordlife.com Sent: Tuesday, March 16, 2004 11:53 AM
To: oracle-l_at_freelists.org
Subject: Possibility of changing Rowid because of UPDATE operations

Hello All,

Do you think of any situation where Oracle would change the rowid(or move the row that causes rowid change) under the hood in 8i/9i or even in 10g if there are simply Update operations happen on a row?

I know that the Rowid of the row is not going to change when there is a row chaining/migration. So, this is not an issue. And, I understand that the Rowid would change in other situations like row is deleted/inserted, table is exported/imported, truncated/reloaded or alter table..move and other similar operations.

But, I am only concerned with Update operations. Even in IOT and Cluster tables, I believe Oracle would maintain the same rowid if there is an Update to a row.

Please let me know your thoughts/suggestions.

Ours is a DW environment and would like to use the rowids to identify changes in the source table where there is no primary/unique key.

Thanks in advance,

Best Regards,
Prasad

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Received on Tue Mar 16 2004 - 13:56:33 CST