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UNDO vs. Rollback Segments [message #204034]

Fri, 17 November 2006 07:21

Frank Naude
Messages: 4582
Registered: April 1998

Senior Member

How would you respond if an application vendor tells you:

Quote:

Another issue that COPMANYX noticed from their analysis of the information provided, is the use of UNDO tablespaces instead of rollback segments. You indicated that you use UNDO instead of rollback segments as it is easier and more efficient. However, COMPANYX indicated that the product has not been tested this way, and that you should use rollback segments. Can you please indicate if this is acceptable?

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Re: UNDO vs. Rollback Segments [message #204039 is a reply to message #204034]

Fri, 17 November 2006 07:47

Mahesh Rajendran
Messages: 10708
Registered: March 2002
Location: oracleDocoVille

Senior Member
Account Moderator

>> product has not been tested this way, and that you should use rollback segments
Thats funny.
RBS or UNDO segments are oracle internal mechanisms.
What does the application code has to with it?
If the code is bad, issues like ora-01555 are inevitable and only solution is to increase the RBS or UNDO retention (whatever is been used).
Methinks, this is just another tech support trivia.
It is with the folks who are about to maintain this database.Any version above 8i must use UNDO.
Statistically, i have myself seen a lot of RBS related issues winding down after using an optimal UNDO RETENTION.

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Re: UNDO vs. Rollback Segments [message #204318 is a reply to message #204039]

Mon, 20 November 2006 02:44

Frank Naude
Messages: 4582
Registered: April 1998

Senior Member

Thanks Mahesh! I will try to convince them of the facts, however, I don't think they'll listen to reason...

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Re: UNDO vs. Rollback Segments [message #204640 is a reply to message #204318]

Tue, 21 November 2006 08:30

Frank Naude
Messages: 4582
Registered: April 1998

Senior Member

You cannot win with these guys:

Quote:

We've logged an enhancement request to support UNDO MANAGEMENT (Feature introduced in Oracle 9i).

They (the user) are right about known issues with rollback segments. But, there are also bugs with REDO MANAGEMENT. We do NOT support it yet...

They will definitely get my vote for worst Oracle implementation of the year! Just a pity I cannot name names.

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