Re: Avoiding bad prepared-statement plans.

Jeroen Vermeulen <jtv@xs4all.nl> writes:
> I think we should be careful not to over-think this.  Planning isn't *that*
> costly, so apply Amdahl's Law liberally.  I'm proposing some easy things we
> could do without adding much overhead or maintenance burden; I've been
> assuming that getting intimate with the planner would risk those advantages.

On a project where performance is a must (5ms per query is about all you
can ask) I have queries for which planning is 40+ ms and execute 2 to 5
ms (dataset fits in RAM, by design).

I'm then abusing pgbouncer so that the PREPARE is shared by a lot of
clients, all the ones landing into the session (transaction pooling).

See preprepare to get a better idea, even if we're yet to run it (it's
being used in production elsewhere, though, I've been told).
 http://preprepare.projects.postgresql.org/

Regards,
-- 
dim