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  2. RPG400-L
  3. May 2007

Re: More Questions on UDF

Alan,

Surely it won't be *that* bad. After all, the object resolution will only
take place once; the first time the UDF (program) is called. After that, it
should be almost as quick as a service program procedure call. Or is it
different when SQL is brought into the mix?

Rory


On 5/9/07, Alan Campin <Alan.Campin@xxxxxxxxxxxxxxxx> wrote:

Michael, I don't know if this has already come through to you but you
are looking at severe performance penalties using a dynamically called
program inside of service program.

IBM originally implemented UDF's as programs but it was too slow and
they added the ability for them to be service programs.

If you use your UDF in an SQL statement and you have to process a
100,000 records, you are looking at 100,000 dynamic calls.

A service program procedure call is nano-seconds vs a 100 milliseconds
for a program call.

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