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Re: Various performance questions

From: Tarhon-Onu Victor <mituc(at)iasi(dot)rdsnet(dot)ro>
To: Dror Matalon <dror(at)zapatec(dot)com>
Cc: Postgresql Performance <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Various performance questions
Date: 2003-10-27 15:15:05
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
On Sun, 26 Oct 2003, Dror Matalon wrote:

> Here's the structure of the items table
>  pubdate       | timestamp with time zone |
> Indexes:
>     "item_channel_link" btree (channel, link)
>     "item_created" btree (dtstamp)
>     "item_signature" btree (signature)
>     "items_channel_article" btree (channel, articlenumber)
>     "items_channel_tstamp" btree (channel, dtstamp)
> 5. Any other comments/suggestions on the above setup.

	Try set enable_seqscan = off; set enable_indexscan = on; to 
force the planner to use one of the indexes. Analyze the queries from 
your application and see what are the most used columns in WHERE clauses 
and recreate the indexes. select count(*) from items where channel < 
5000; will never use any of the current indexes because none matches 
your WHERE clause (channel appears now only in multicolumn indexes).

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