How much UNDO does a query need?

It seems that due to a gigantic delete, I am running out of UNDO. How can I see exactly how much undo a query needs?
Searching on the web, I found this:
select sq.sql_text sql_text, t.USED_UREC Records, t.USED_UBLK Blocks, (t.USED_UBLK*8192/1024) KBytes from v$transaction t,
v$session s,
v$sql sq
where t.addr = s.taddr
and s.sql_id = sq.sql_id
and s.username = 'blah'
, which is fine, but it seems to be returning results for only running queries. In other words, when the delete query I am investigating is executed, the above select returns no rows. Is there a way to modify it to return also queries that have been executed?
Any help is welcome.
Message was edited by:
user622271

Hi,
It seems that you need to make an outer join between v$sql and v$session views [s.sql_id = sq.sql_id(+)] ... For more information is if this [url http://forums.oracle.com/forums/thread.jspa?messageID=1756927&#1756927]thread can help you.
Cheers
Legatti

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