| From: | Ken Hill <ken(at)scottshill(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Markus Schaber <schabi(at)logix-tt(dot)com>, pgsql-sql(at)postgresql(dot)org |
| Subject: | Re: Non Matching Records in Two Tables |
| Date: | 2006-02-14 21:25:36 |
| Message-ID: | 1139952337.3083.68.camel@localhost.localdomain |
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| Thread: | |
| Lists: | pgsql-sql |
On Tue, 2006-02-14 at 16:07 -0500, Tom Lane wrote:
> Ken Hill <ken(at)scottshill(dot)com> writes:
> > Seq Scan on ncccr10 (cost=0.00..20417160510.08 rows=305782 width=104)
> > Filter: (NOT (subplan))
> > SubPlan
> > -> Seq Scan on ncccr9 (cost=0.00..65533.71 rows=494471 width=104)
> > (4 rows)
>
> > Any ideas why it is so slow?
>
> "NOT (subplan)" is horrendous (and the system knows it, note the huge
> cost estimate). Try increasing work_mem enough so you get a hashed
> subplan instead.
>
> regards, tom lane
How do I ncrease work_mem?
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