I suggest you experiment a bit. Create 100 million objects, and do some of the actions you are planning to do on them.

Right. I'm thinking of taking the time to try a simple SQL based implementation, as well as one in ZODB. I need to learn more about high-speed Zope programming as well as keeping my SQL skills up to date so. :-) -Morten -- Morten W. Petersen Manager Nidelven IT Ltd Phone: +47 45 44 00 69 Email: morten@nidelven-it.no