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  3. June 2010

Re: System slow-down - disk usage?

Crispin,

Slight correction, chain is faster only if the key being searched for
doesn't exist AND the key is greater than anything else in the file.

Otherwise SETLL is faster.

Charles


On Tue, Jun 15, 2010 at 2:03 PM, Crispin Bates <cbates@xxxxxxxxxxx> wrote:
Is CHAIN always faster? If the large majority of the data access is failing
(the records are not found), then CHAIN is going to be quicker, because
SETLL has to position the file pointer to EOF, and with 20 Million Records,
that might slow things down slightly.

At least that's what Barbara Morris seemed to think here -
http://forums.systeminetwork.com/isnetforums/showthread.php?t=49800

Not sure if that's what is happening in this case, or if there is anything
OP can do, as the file seems to grow and then get smaller, based on the
description...

----- Original Message -----
From: "Charles Wilt" <charles.wilt@xxxxxxxxx>
To: "Midrange Systems Technical Discussion" <midrange-l@xxxxxxxxxxxx>
Sent: Tuesday, June 15, 2010 1:42 PM
Subject: Re: System slow-down - disk usage?


SETLL does keyed access, and is faster than a chain if all you want to
know is does the record exist.

Charles



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