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Retaining execution plans between connections?

From: James Russell <internationalhobo(at)gmail(dot)com>
To: pgsql-performance(at)postgresql(dot)org
Subject: Retaining execution plans between connections?
Date: 2006-01-20 09:14:15
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
Hi there,

I am running a website where each page connects to the DB to retrieve and
write information. Each page load uses a separate connection (rather than
just sharing one as is the common case) because I use a lot of transactions.

I am looking to speed up performance, and since each page executes a static
set of queries where only the parameters change, I was hoping to take
advantage of stored procedures since I read that PostgreSQL's caches the
execution plans used inside stored procedures.

However, the documentation states that this execution plan caching is done
on a per-connection basis. If each page uses a separate connection, I can
get no performance benefit between pages.

In other words, there's no benefit to me in putting a one-shot query that is
basically the same for every page (e.g. "SELECT * FROM users WHERE
user_name='<username>'") inside a stored proc, since the generated execution
plan will be thrown away once the connection is dropped.

Has anyone found a way around this limitation? As I said, I can't share the
DB connection between pages (unless someone knows of a way to do this and
still retain a level of separation between pages that use the same DB

Many thanks,



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Subject: Re: Retaining execution plans between connections?
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Subject: SELECT MIN, MAX took longer time than SELECT COUNT, MIN, MAX

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