[Sandor] > This is still a question. Is there any way, to determine how many > times a zodb persistent object is referenced?
ZODB itself doesn't keep track of that, although it's possible to write a storage that does. FileStorage does not. BerkeleyStorage did (past tense because Zope Corp has given up on BerkeleyStorage for now). > sys.getrefcount seems to tell me only those references which are > currently loaded in the memory. Yes, sys.getrefcount() is a Python builtin, and only knows about in-memory Python objects. Python (and its builtins) doesn't know anything about persistence. > Also another very interesting question is that who referring > to a specific object. Like at the start, it would be possible to write a storage that saves away that kind of "inverted index", but I don't know of any that do. Given a particular flavor of storage, and detailed knowledge of its implementation, you can write scripts to crawl over the storage and compute anything you like. For FileStorage, the standard tools fsrefs.py and fsdump.py illustrate two ways of picking apart an .fs file. _______________________________________________ Zope-Dev maillist - [EMAIL PROTECTED] http://mail.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope )