Re: CHAIN versus SETLL

["James W. Kilgore" <qappdsn@xxxxxxx>]

Wayne Achenbaum wrote:
> I was always taught to use
> a setll, not a chain when record existence was the only task at hand.
> --
For existance testing (no data values required) your technique is the
least costly.
Both will provide you with an indicator to test for existance, but I
don't think the SETLL would perform a record move to buffer since it is
only reading the index.  I believe the buffer move occurs with any
following read operation.

For an online entry program performing a couple of tests it may not make
any difference in response time....but if you needed to do a couple of
dozen tests with each press of the enter key it may reduce screen turn
around time a bit.

-- 
===================================================
James W. Kilgore   | Progressive Data Systems, Inc.
President          | 311 31st Ave SE
(206) 848-2567     | Puyallup, Washington 98374 USA
qappdsn@ibm.net    | http://www.ultimate.org/PDS
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