Re: Performance Question

From: Douglas McNaught <doug(at)mcnaught(dot)org>
To: Terry Lee Tucker <terry(at)esc1(dot)com>
Cc: <pgsql-general(at)postgresql(dot)org>
Subject: Re: Performance Question
Date: 2006-06-14 20:21:33
Message-ID: 8764j31oaa.fsf@suzuka.mcnaught.org
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Terry Lee Tucker <terry(at)esc1(dot)com> writes:

> Hello List:
>
> I've been told that an update to a record is equivalent to a delete
> and insert operation. We have a utility written in Perl that brings
> into sync certain elements of 50 thousand records on 8 structurally
> identical databases. We threw together the script and decided to
> just delete the record and re-insert it with the data that was
> brought into sync. Now the question: Is it just as fast to do it
> this way, or is there some hidden advantage to performing an update?

UPDATE will probably be somewhat faster because it's only one SQL
statement to parse, plan and execute.

-Doug

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