| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Leonardo Francalanci <m_lists(at)yahoo(dot)it>, Boszormenyi Zoltan <zb(at)cybertec(dot)at>, pgsql-hackers Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: plan time of MASSIVE partitioning ... |
| Date: | 2010-10-29 19:11:50 |
| Message-ID: | 1288379037-sup-1073@alvh.no-ip.org |
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| Lists: | pgsql-hackers |
Excerpts from Tom Lane's message of vie oct 29 14:15:55 -0300 2010:
> I wrote:
> > This is going to be dominated by constraint exclusion checking.
>
> Hmm, maybe I spoke too soon. With 9000 child tables I get a profile
> like this:
>
> samples % symbol name
> 447433 47.1553 get_tabstat_entry
Is there a reason for keeping the pgstat info in plain lists? We could
use dynahash there too, I think. It would have more palloc overhead
that way, though (hmm, but perhaps that can be fixed by having a smart
"alloc" function for it, preallocating a bunch of entries instead of one
by one).
--
Álvaro Herrera <alvherre(at)commandprompt(dot)com>
The PostgreSQL Company - Command Prompt, Inc.
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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