On Dec 15, 2009, at 11:47 AM, Michael Bayer wrote: >> > > the 53K calls to mapper._save_obj() indicate that your flush plan is > creating an enormous dependency tree. Or, much less likely, you're using > the "batch=False" flag on mapper, which is highly not recommended. For a > simple flush plan, such as a list of objects A each of which contain a > one-to-many collection of objects B, _save_obj() would be called about > four times. A flush plan like the one you have could for example occur > in some self-referential scenarios, if you have a deep tree of recursive > relationships for example. A test script illustrating mappings and > sample objects which produce a huge flush like this would be helpful, as > there may be either an improvement to your mapping, or within the unit of > work code which could optimize whatever is occurring here.
just in case you're not motivated to share mappings here, I would note that an incorrect placement of a flag like "remote_side" on a relation() may be causing this. I've never seen a flush plan that results in _save_obj() being called more than a few dozen times, in fact. So we really need to see how you're getting that result, since if its a configurational error I'll add a check such that the incorrect configuration becomes impossible. > > > > > > > > >> >> -- >> >> You received this message because you are subscribed to the Google Groups >> "sqlalchemy" group. >> To post to this group, send email to sqlalch...@googlegroups.com. >> To unsubscribe from this group, send email to >> sqlalchemy+unsubscr...@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/sqlalchemy?hl=en. >> >> >> > > -- > > You received this message because you are subscribed to the Google Groups > "sqlalchemy" group. > To post to this group, send email to sqlalch...@googlegroups.com. > To unsubscribe from this group, send email to > sqlalchemy+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/sqlalchemy?hl=en. > > -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalch...@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
