RE: UDF bad performance

Try defining the function as DETERMINISTIC.

Michael Salsman

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxxxxxxxx] On Behalf Of Justin Taylor
Sent: Friday, May 10, 2019 07:30
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: UDF bad performance

I have this UDF that returns an integer:
BEGIN
RETURN CEILING ( LENGTH * WIDTH * HEIGHT / 166 ) ; END

Calls to this UDF take a lot longer than I expect (about 21x longer than an index-based SELECT statement). I checked all the parameters, and the data types match verbatim so there shouldn't be any implicit conversions.

Any suggestions?


TIA
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