Re: Function performance degrades after repeated execution

so 16. 11. 2019 v 16:46 odesílatel Ron <ronljohnsonjr(at)gmail(dot)com> napsal:

> On 11/16/19 8:22 AM, Dave Roberge wrote:
> > Hi,
> >
> > We've been troubleshooting a slow running function in our postgres
> database. I've been able to boil it down to the simplest function possible.
> It looks like this:
> >
> > FOR rec IN select 1 as matchval FROM table1 t1, table2 t2
> > join table3 t3 on t3.col = t2.col
> > WHERE t1.col = id
> > LOOP
> > IF rec.matchval > 0 THEN
> > co := co + 1;
> > END IF;
> > if co % 100 = 0 then
> > raise notice 'match value %', co;
> > end if;
> > END LOOP;
>
> Where are you joining table1 to either table2 or table3?
>

good shot - there is maybe unwanted cartesian product

Pavel

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