| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | PFC <lists(at)peufeu(dot)com> |
| Cc: | Jesper Krogh <jesper(at)krogh(dot)cc>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: "Slow" query or just "Bad hardware"? |
| Date: | 2008-03-27 17:54:09 |
| Message-ID: | 20080327175409.GP8764@alvh.no-ip.org |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
PFC wrote:
> Also, sometimes offine TOASTing is evil :
> Say you have a forum, you want the posts table to be CLUSTER'ed on
> (topic_id, post_id) so displaying 1 page with 30 posts on it uses 1 seek,
> not 30 seeks. But CLUSTER doesn't touch the data that has been pushed
> offline in the toast table. So, in that case, it can pay (big time
> actually) to disable toasting, store the data inline, and benefit from
> cluster.
This claim is false -- CLUSTER does process the toast table along the
main heap.
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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