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Re: cacheable stored functions?

From: Richard Huxton <dev(at)archonet(dot)com>
To: Bill Moran <wmoran(at)potentialtech(dot)com>,pgsql-performance(at)postgresql(dot)org
Subject: Re: cacheable stored functions?
Date: 2004-02-20 16:01:28
Message-ID: 200402201601.28789.dev@archonet.com (view raw or flat)
Thread:
Lists: pgsql-performance
On Friday 20 February 2004 15:35, Bill Moran wrote:
> I'm converting a SQL application to PostgreSQL.  The majority of the logic
> in this application is in the stored functions in the database.
>
> Somewhere, I saw a reference to "WITH (iscachable)" for stored functions,
> looking again, I'm unable to find any reference to this directive.  I have
> a single function that is _obviously_ safe to cache using this, and it
> generates no errors or problems that I can see.
>
> Now I'm looking at a lot of other functions that, if cached, would speed
> up performance considerably.  Yet I'm reluctant to use this directive
> since I can't find documentation on it anywhere.

From memory, "iscachable" was replaced in version 7.3 by the three 
finer-grained settings IMMUTABLE, STABLE, VOLATILE.

I'm guessing the old behaviour is still there for backwards compatibility, but 
it's probably best to use the new versions.

-- 
  Richard Huxton
  Archonet Ltd

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