Re: What do you use autonomous transactions for?

From: Jonathan Lewis <jonathan_at_jlcomp.demon.co.uk>
Date: Tue, 17 Feb 2004 10:58:59 -0000
Message-ID: <01bc01c3f545$0bce16b0$6702a8c0@Primary>

There's an example of the sorts of error that this can produce in my book on
pages 446-448.

Regards

Jonathan Lewis
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Original Message ----- From: "Tony Davis" <tony_at_apress.com> To: <oracle-l_at_freelists.org> Sent: Tuesday, February 17, 2004 10:03 AM Subject: RE: What do you use autonomous transactions for?

Hi,

Apparently, it is not recommended to use autonomous transactions to avoid mutating table errors, as documented in Metalink Note:65961.1:

"As all database changes are part of a transaction, if a parent has modified data, but not committed it at the point the autonomous transaction begins, then those modifications are not visible to the child...It is important to remember that if a trigger is running as an autonomous transaction, although it still has access to :OLD and :NEW values as appropriate, it does not see any rows inserted into the table by the calling transaction. Thus, using an autonomous trigger to obtain a maximum value currently in the table...[in other words, a mutating table scenario]...is unlikely to work."

Cheers,

Tony.

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Received on Tue Feb 17 2004 - 04:58:59 CST