Hi, we've recently seen a the Data.fs in a few of our Zope systems grow rather fat (from stable sizes around the 100-300MB level to >3GB in the most extreme cases). On further investigation it appears that regular user page requests are being recorded in the Zope undo log - these are not object modifications that have changed the objects themselves (the modification date against all these objects is unchanged), but normal HTTP GET requests. Systems are all 2.11.0 Zope clients with Data.fs served by matching versions of Zeo. Not all of our 2.11.0 apps that are showing this behaviour, only a couple, so I doubt it's something wrong with Zope or ZEO. I'm not a Zope developer, but can anyone shed any light on the possible issues that would cause regular requests to be logged in this way? Regards John