try: Perform table transaction break except: rollback delay try again to perform table transaction
I'm sure you will get the gist of the above and why. I also set my isolation_level to READ UNCOMMITED. Thanks, Garyc --- On Thu, 5/6/10, rajasekhar911 <rajasekhar...@gmail.com> wrote: > From: rajasekhar911 <rajasekhar...@gmail.com> > Subject: [sqlalchemy] how to handle deadlock > To: "sqlalchemy" <sqlalchemy@googlegroups.com> > Date: Thursday, May 6, 2010, 5:23 AM > Hi > > I am using sqlalchemy0.5.5 in my TG2 app with mysql(innodb) > database > My applicaton is multithreaded. > there are multiple tasks that run at certain intervals. > in one of my tables i am getting the following deadlock > error. > Deadlock found when trying to get lock; try restarting > transaction > > the query was failing while trying to delete in the > following way. > DBSession.query(Metrics).filter(Metrics.type_id==type_id).filter(Metrics.cdate > <= date1).delete() > > so i changed the code to > rows = > DBSession.query(Metrics).filter(Metrics.type_id==type_id).filter(Metrics.cdate > <= date1).all() > for row in rows : > DBSession.delete(row) > assuming that it will scan less no:of rows while deleting. > In this way > i am no longer seeing the deadlock error. > but if anybody can clarify that this is reliable enough or > suggest any > other options , > that would be really helpful > > thanks > > -- > 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.