Re: Nested Loop "Killer" on 8.1 - Mailing list pgsql-performance

From Tom Lane
Subject Re: Nested Loop "Killer" on 8.1
Date
Msg-id 10310.1246054920@sss.pgh.pa.us
Whole thread Raw
In response to Re: Nested Loop "Killer" on 8.1  ("Dave North" <DNorth@signiant.com>)
List pgsql-performance
"Dave North" <DNorth@signiant.com> writes:
> The outstanding question here is why does the explain analyze take
> (quite a bit) longer than just executing the query?

EXPLAIN ANALYZE has nontrivial measurement overhead, especially on
platforms with slow gettimeofday().  Old/cheap PC hardware, in particular,
tends to suck in this respect.

            regards, tom lane

pgsql-performance by date:

Previous
From: Scott Mead
Date:
Subject: Re: Terrible Write Performance of a Stored Procedure
Next
From: Greg Smith
Date:
Subject: Re: Terrible Write Performance of a Stored Procedure