Deadlock - can you make both transactions rollback?

My understanding of Oracle (11.2.0.3) is that if the engine detects a deadlock, it picks one transaction to rollback and one to succeed.
Is it possible to configure a system or session setting that would instruct the engine to roll back both transactions?
Long story short...I'm being asked this question because developers' code isn't perfect

Hi Raindog,
> My understanding of Oracle (11.2.0.3) is that if the engine detects a deadlock, it picks one transaction to rollback and one to succeed.
It is not the engine - it is the database session itself. The documentation states, that the session is picked randomly, but this is not true in fully manner. The session, that is waiting the longest time will do the statement level rollback and raise an ORA-00060. Why? The timeout for enqueues (in that context) is 3 seconds and so the sessions that are waiting for that enqueue will wake up every 3 seconds and check the lock states. However as all of the other guys already mentioned "a statement rollback is performed" and not a "full transaction rollback". So it is up to your application to react on the ORA-00060 and do something useful (which is not that easy).
> Is it possible to configure a system or session setting that would instruct the engine to roll back both transactions?
No nothing "by Oracle default", but ideally your application reacts on the ORA-00060, identifies the other session and kills both for example (which performs an implicit rollback).
> I'm being asked this question because developers' code isn't perfect
... then help your developers to make it better by explaining the error handling and its following actions
Regards
Stefan

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Deadlock - can you make both transactions rollback?

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