Hi everybody, How would you populate a "huge" ZODB with hundreds of thousands of objects which have no specific reason to be hierarchically distributed in a complex tree of folders and sub-folders? They could in fact all be in the same folder. It seems to be OK for hundreds of objects, but afterwards there is an incremental cost : each time you add a new object, there is a check on the existence of an identical ID before adding/creating it. When you reach the level of already existing thousands/tens of thousands/hundreds of thousands objects in the same folder it seems you are in serious trouble... I know the question is a bit naive, and that usually you have a data structure which dictates a naturally "hierarchy" of folders which means that no folder would contain maybe more than a few hundred objects or sub-folders. Maybe I should "artificially" design an ID structure which would correspond to a hierarchy : for instance ojects would be identified by numbers with 7 digits, each digit corresponding to a lower level in the hierarchy? It means that an object with ID 2343789 would be placed in the "/2/3/4/3/7/8/9" sub-folder. What do you think? Any other idea? Pierre Godefroy 52 rue des Archives 75004 PARIS FRANCE Tél. : +33 (0)1 42 74 46 05