| From: | Stephan Szabo <sszabo(at)megazone(dot)bigpanda(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Simon Riggs <simon(at)2ndquadrant(dot)com>, Karim A Nassar <Karim(dot)Nassar(at)NAU(dot)EDU>, Christopher Kings-Lynne <chriskl(at)familyhealth(dot)com(dot)au>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Delete query takes exorbitant amount of time |
| Date: | 2005-03-29 16:38:28 |
| Message-ID: | 20050329083336.G58020@megazone.bigpanda.com |
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| Lists: | pgsql-performance |
On Tue, 29 Mar 2005, Tom Lane wrote:
> Stephan Szabo <sszabo(at)megazone(dot)bigpanda(dot)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
Me too, honestly.
> always know at the time of preparing a plan which way it will be used?
I believe so. I think each saved plan pretty much lives for a single
trigger type/argument set and is basically used in only one place.
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