| From: | Mitar <mmitar(at)gmail(dot)com> |
|---|---|
| To: | David Rowley <david(dot)rowley(at)2ndquadrant(dot)com> |
| Cc: | "pgsql-generallists(dot)postgresql(dot)org" <pgsql-general(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Optimizing the same PREPAREd static query (without parameters) |
| Date: | 2019-01-07 08:40:38 |
| Message-ID: | CAKLmikMPAZHJRON5CUviVysDvaiSQeOduWjCbUC2G89Shs=r+A@mail.gmail.com |
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| Lists: | pgsql-general |
Hi!
On Mon, Jan 7, 2019 at 12:09 AM David Rowley
<david(dot)rowley(at)2ndquadrant(dot)com> wrote:
> On Mon, 7 Jan 2019 at 18:54, Mitar <mmitar(at)gmail(dot)com> wrote:
> > If I have a PREPAREd query without parameters (static) and I EXECUTE
> > it repeatedly in the same session, does PostgreSQL learn/optimize
> > anything across those runs?
>
> Yes, it will generate the query plan on the first invocation of
> EXECUTE and use that plan for all subsequent EXECUTEs for the session
> until you DEALLOCATE the prepared query or DISCARD PLANS/ALL;
So this sounds more like no? So the same plan is used, so PostgreSQL
is not further optimizing the plan based on any statistics or
anything?
Mitar
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