Re: What do you use autonomous transactions for?
- From: "Jonathan Lewis" <jonathan@xxxxxxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 17 Feb 2004 10:58:59 -0000
There's an example of the sorts of error
that this can produce in my book on
pages 446-448.
Regards
Jonathan Lewis
http://www.jlcomp.demon.co.uk
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who can answer the questions, but the
person who can question the answers -- T. Schick Jr
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----- Original Message -----
From: "Tony Davis" <tony@xxxxxxxxxx>
To: <oracle-l@xxxxxxxxxxxxx>
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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