I changed it to delete one row at a time and it's taking 3 minutes. On Wed, Apr 24, 2013 at 6:38 PM, Setiaman Lee <[email protected]> wrote: > Larry, > > > Avoid to use IN clause. I'd say to insert the events you want to delete into > the temp table. You can put the session id or user id in temp table to > differentiate set of data from other users. Then do the delete by joining > the temp table to the Event_Message_ldx table. your sql might look like > this: > > delete event_message_ldx > from temp > where event_message_ldx.event_id = temp.event_id > and temp.userid = %s > > above SQL can be executed in Django using RAW SQL. See the link below. > https://docs.djangoproject.com/en/dev/topics/db/sql/ > > Test the SQL in the MySQL workspace when it works then move the code to the > Django. > > Rgrds, > Setiaman Lee > > > > > > On Thu, Apr 25, 2013 at 8:12 AM, Larry Martell <[email protected]> > wrote: >> >> I have a table that has 2.5 million rows and 9 columns that are all >> int except for 2 varchar(255) - i.e. not that big of a table. I am >> executing this statement: >> >> Event_Message_Idx.objects.filter(event_id__in=event_ids).delete() >> >> Where event_ids has around 1,500 items in it. There is an index on >> event_id. This statement is taking 1 hour and 5 minutes to run. There >> is nothing else hitting the database at that time, and the machine >> it's running on is 97% idle and has plenty of free memory. This seems >> extremely excessive to me. I would guess it's because of the in >> clause. Perhaps this is more of a MySQL question when a django one, >> but is there some better way to do a delete like this in django? >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Django users" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> Visit this group at http://groups.google.com/group/django-users?hl=en. >> For more options, visit https://groups.google.com/groups/opt_out. >> >> > > -- > You received this message because you are subscribed to the Google Groups > "Django users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/django-users?hl=en. > For more options, visit https://groups.google.com/groups/opt_out. > >
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