Dispatcher using 100% CPU with 4GB space "used"

A short story with a happy ending ...
A user tried to create a "big" table with a possibly somewhat cartesian select, resulting in the "oh no you don't: that would exceed 4GB" error/cancel scenario.
They cancelled and went back to working on the few hundred megs of data but "system seems very slow ..." . The dispatcher d000 was consuming 99.9% CPU. After a fair amount of looking around on the system and in this excellent forum (some hints but no exact match - hence this post) I decided that the problem was the TEMP tablespace being stuck with nearly 4G size (5MB used) but unshrikable .
Solution: I squeezed SYSAUX and USERS till they squeeled to get a couple of extra available MB, then created a 10MB new temporary tablespace, made it default temp, (would have altered any users set with non-default temporary tablespace but assumed there were none so ... ;-) bounced the database, shrank/fixed the original temp and made it the default again (with a lower max size constraint and a longing for the production version where temp will not count ;-)
For info: OS/Environment Linux SuSE 10 x86_64 : Opteron with 8GB Mem and
lots of disk ...
(No relevant info in the trace files/alert log etc so not posted - everything up and unremarkable but slow and with 1 very busy dispatcher process)
Otherwise pretty standard XE install running excellently for months.
Thanks everyone!

Gruss Dietmar,
thanks for linking this to a better and clearer exposition of the space issues
(<excuse>it was late here and home was already phoning to say the dinner was in the cat ;-)</excuse>.
My reason for posting remains the strange 99.9% CPU user of the dispatcher while the system was in the "on-the-edge-of 4GB" state (and this behaviour survived an instance bounce and produced no other sign (trace file or alert log) than the evidence of ps/top or the obvious degradation in performance. Could be there's a little bug for the developers to squash in the marginal case (which could even apply in production if you fill (almost ??) the data counted in production ? Whatever the case the problem is pretty benign and easily remedied when you know how. I guess the GUI shrink facility and a touch of documentation should help out in the production release as well.
Best Regards,
P-)

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