From: Tom Lane <tgl@sss.pgh.pa.us>
To: Stephan Szabo <sszabo@megazone.bigpanda.com>
Cc: Simon Riggs <simon@2ndquadrant.com>
Cc: Karim A Nassar <Karim.Nassar@NAU.EDU>
Cc: Christopher Kings-Lynne <chriskl@familyhealth.com.au>
Cc: pgsql-performance@postgresql.org
Subject: Re: Delete query takes exorbitant amount of time
Date: Tue, 29 Mar 2005 09:56:41 -0500
Message-ID: <21616.1112108201@sss.pgh.pa.us> (raw)
In-Reply-To: <20050329061837.A51620@megazone.bigpanda.com>
References: <Pine.SOL.4.21.0503290120550.5642-100000@coruscant.cet.nau.edu>
<1112095776.11750.958.camel@localhost.localdomain>
<20050329054714.V50612@megazone.bigpanda.com>
<20050329061837.A51620@megazone.bigpanda.com>
Stephan Szabo <sszabo@megazone.bigpanda.com> writes:
> If there were some way to pass a "limit" into SPI_prepare that was treated
> similarly to a LIMIT clause for planning purposes but didn't actually
> change the output plan to only return that number of rows, we could use
> that.
Hmm ... the planner does have the ability to do that sort of thing (we
use it for cursors). SPI_prepare doesn't expose the capability.
Perhaps adding a SPI_prepare variant that does expose it would be the
quickest route to a solution.
I get a headache every time I look at the RI triggers ;-). Do they
always know at the time of preparing a plan which way it will be used?
regards, tom lane
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To: pgsql-performance@postgresql.org
Cc: tgl@sss.pgh.pa.us, sszabo@megazone.bigpanda.com, simon@2ndquadrant.com, Karim.Nassar@NAU.EDU, chriskl@familyhealth.com.au
Subject: Re: Delete query takes exorbitant amount of time
In-Reply-To: <21616.1112108201@sss.pgh.pa.us>
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