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Re: cacheable stored functions?

From: Bill Moran <wmoran(at)potentialtech(dot)com>
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: cacheable stored functions?
Date: 2004-02-20 16:48:24
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
Richard Huxton wrote:
> 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.

Thanks to everyone who replied (with more or less the same answer ;)

This has explained away my confusion, and I now have a reference to read.

Bill Moran
Potential Technologies

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