From: Tom Lane <tgl@sss.pgh.pa.us>
To: Jonathan Ellis <jonathan@utahpython.org>
Cc: pgsql-performance@postgresql.org
Subject: Re: Premature view materialization in 8.2?
Date: Fri, 06 Apr 2007 02:23:56 -0400
Message-ID: <261.1175840636@sss.pgh.pa.us> (raw)
In-Reply-To: <e06563880704052251j68c86dafx5ba5a8f10fb28268@mail.gmail.com>
References: <e06563880704051146r357cb15by7e498c6d796b093a@mail.gmail.com>
<28349.1175838196@sss.pgh.pa.us>
<e06563880704052251j68c86dafx5ba5a8f10fb28268@mail.gmail.com>
"Jonathan Ellis" <jonathan@utahpython.org> writes:
> On 4/5/07, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>>> Is this a regression, or a "feature" of 8.2?
>>
>> Hard to say without EXPLAIN ANALYZE output to compare.
> To my eye they are identical other than the speed but perhaps I am
> missing something.
Yeah, it sure is the same plan, and 8.2 seems to be a tad faster right
up to the hash join on user_id. Is user_id a textual datatype? I'm
wondering if the 8.2 installation is using a different locale --- the
speed of simple string comparisons can be horrifically worse in some
locales compared to others.
regards, tom lane
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To: pgsql-performance@postgresql.org
Cc: tgl@sss.pgh.pa.us, jonathan@utahpython.org
Subject: Re: Premature view materialization in 8.2?
In-Reply-To: <261.1175840636@sss.pgh.pa.us>
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