> >Does it make sense to have a 'row' context which is released just
> >before starting with a new tuple ? The total number or free is the
> >same but they are distributed over the query and unused memory should
> >not accumulate.
> >I have seen backends growing to 40-60MB with queries which scan a
> >very large number of rows.
> I think this would be appropiate.
It seems that the CPU overhead on all queries would increase trying to
deallocate/reuse memory during the query. There are lots of places in
the backend where memory is palloc'd and then left lying around after
use; I had assumed it was sort-of-intentional to avoid having extra
cleanup overhead during a query.
- Tom