| From: | "Jonah H(dot) Harris" <jonah(dot)harris(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Ilia Kantor <ilia(at)obnovlenie(dot)ru>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: slow IN() clause for many cases |
| Date: | 2005-10-12 06:26:19 |
| Message-ID: | 36e682920510112326v4fe32755i5973a194e6cf008c@mail.gmail.com |
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| Lists: | pgsql-hackers |
true dat :)
On 10/12/05, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>
> "Ilia Kantor" <ilia(at)obnovlenie(dot)ru> writes:
> > Bitmap Heap Scan on objects_hier (cost=60.29..179.57 rows=80 width=600)
> > (actual time=0.835..1.115 rows=138 loops=1)
>
> vs
>
> > Merge Join (cost=62.33..576.80 rows=1117 width=600) (actual
> > time=0.542..2.898 rows=138 loops=1)
>
> Hmm, sure looks from here like the bitmap plan is faster.
>
> regards, tom lane
>
> ---------------------------(end of broadcast)---------------------------
> TIP 2: Don't 'kill -9' the postmaster
>
--
Respectfully,
Jonah H. Harris, Database Internals Architect
EnterpriseDB Corporation
http://www.enterprisedb.com/
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