Hello, We're having here a problem in a high load situation with quite long running (10-20 secs) transactions. The app uses mySQL extensively, and just a bare minimum of ZODB to store the root and registrations. I think that there's lower level error concerning ZODB, but in zope.rdb, in queryForResults, line 381: except Exception, error: eats the traceback. This smells like https://bugs.launchpad.net/zope3/+bug/98331 So I propose to move that except further down the stack, where it will really catch just DB errors. Or any better idea is welcome. ------------ Module zope.publisher.publish, line 133, in publish result = publication.callObject(request, obj) Module zope.app.publication.zopepublication, line 161, in callObject return mapply(ob, request.getPositionalArguments(), request) Module zope.publisher.publish, line 108, in mapply return debug_call(obj, args) __traceback_info__: <security proxied zope.app.publisher.browser.viewmeta.ManagementViewSelector instance at 0x48822a0c> Module zope.publisher.publish, line 114, in debug_call return obj(*args) Module zope.app.publisher.browser.managementviewselector, line 35, in __call__ item = getFirstMenuItem('zmi_views', self.context, self.request) Module zope.app.publisher.browser.menu, line 181, in getFirstMenuItem items = getMenu(id, object, request) Module zope.app.publisher.browser.menu, line 176, in getMenu return menu.getMenuItems(object, request) Module zope.app.publisher.browser.menu, line 53, in getMenuItems if item.available(): Module zope.app.publisher.browser.menu, line 113, in available view = traverser.traverseRelativeURL( Module zope.app.publication.browser, line 47, in traverseRelativeURL ob = self.traversePath(request, ob, path) Module zope.app.publication.publicationtraverse, line 95, in traversePath ob = self.traverseName(request, ob, name) Module zope.app.publication.publicationtraverse, line 61, in traverseName ob2 = adapter.publishTraverse(request, nm) Module zope.app.container.traversal, line 72, in publishTraverse return self.context[name] Module ....container, line 65, in __getitem__ if not self.__contains__(key): Module ....container, line 111, in __contains__ results = queryForResults(db,query) Module zope.rdb, line 384, in queryForResults raise DatabaseException(str(error)) DatabaseException: Shouldn't load state for 0x50 when the connection is closed -- Best regards, Adam GROSZER mailto:agroszer@gmail.com -- Quote of the day: Major Premise: Sixty men can do a piece of work sixty times as quickly as one man. Minor Premise: One man can dig a posthole in sixty seconds; Conclusion: Sixty men can dig a posthole in one second.