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

The educated person is not the person
who can answer the questions, but the
person who can question the answers -- T. Schick Jr


Next public appearances:
March 2004 Hotsos Symposium - The Burden of Proof
March 2004 Charlotte NC OUG - CBO Tutorial
April 2004 Iceland


One-day tutorials:
http://www.jlcomp.demon.co.uk/tutorial.html


Three-day seminar:
see http://www.jlcomp.demon.co.uk/seminar.html
____UK___February
____UK___June


The Co-operative Oracle Users' FAQ
http://www.jlcomp.demon.co.uk/faq/ind_faq.html


----- Original Message -----
From: "Tony Davis" <tony@(protected)>
To: <oracle-l@(protected)>
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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