I just checked in a bunch of Python *and* C changes that implement "subtransactions". These let you essentially checkpoint work to save memory and throw away partial results without bailing on an entire transaction. I've also updated File and Image objects to take advantage of this feature. (See lib/python/OFS/Image.py if your curious.) I'll be updating the UML model soon to give more information. If you cvs update your ZODB package, you *must* recompile your ZODB binary extensions (at least cPickleCache) as the Python changes depend on the C changed. Jim -- Jim Fulton mailto:jim@digicool.com Python Powered! Technical Director (888) 344-4332 http://www.python.org Digital Creations http://www.digicool.com http://www.zope.org Under US Code Title 47, Sec.227(b)(1)(C), Sec.227(a)(2)(B) This email address may not be added to any commercial mail list with out my permission. Violation of my privacy with advertising or SPAM will result in a suit for a MINIMUM of $500 damages/incident, $1500 for repeats.