Re: Slow indexscan

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Mikko Partio" <mpartio(at)gmail(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Slow indexscan
Date: 2007-06-20 19:29:54
Views: Raw Message | Whole Thread | Download mbox
Lists: pgsql-performance

"Mikko Partio" <mpartio(at)gmail(dot)com> writes:
> I guess the sort_mem helped, or then part of the rows are in the cache
> already. Should increasing sort_mem help here since there are no sorts etc?

No, it wouldn't --- this change has to be due to the data being already
loaded into cache.

There's no obvious reason for the previous query to be so slow, unless
you've got horrendously slow or overloaded disk hardware. What sort of
machine is this anyway, and was it doing any other work at the time?

regards, tom lane

In response to


Browse pgsql-performance by date

  From Date Subject
Next Message Andrew Sullivan 2007-06-20 19:45:33 Re: On managerial choosing (was: Postgres VS Oracle)
Previous Message Shaun Thomas 2007-06-20 19:25:28 Re: Performance query about large tables, lots of concurrent access