What happens when UNDO space is full? Transaction takes more time to ERROR?

I have a long running transaction (more than 3 hours), and at the same time other operations are occurring on different tables, using the same UNDO space.
Sometimes we see ORA-30036, but this error occurs very late in the process.
The transaction normally takes 3 hours, but when UNDO space is full, we do not get ORA-30036 upto 8 hours or 9 hours of process.
I am wondering what could be happening in the background, when UNDO space is full, whcih makes the transaction to extend upto 8 hours or 9 hours (pl. note, this transaction gets completed within 3 hours normally).
This is in 11g, UNDO space is managed manually.
Any clues? Thanks in advance.
Edited by: user588583 on Jan 26, 2011 8:44 AM

user588583 wrote:
Any clues? Thanks in advance.Check with your DBA if resumable operations are set, or check RESUMABLE_TIMEOUT init.ora parameter yourself. If it is set to non-zero value, Oracle will suspend SQL statement execution if it runs out of certain resources, and running out of UNDO space is one of them. SQL statement execution will be suspended for RESUMABLE_TIMEOUT seconds giving DBA time to fix space issue. Then SQL statement execution will contitue. If issue is not fixed within RESUMABLE_TIMEOUT, statement will fail.
SY.

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