MIDRANGE dot COM Mailing List Archive



Home » MIDRANGE-L » April 2008

RE:



fixed

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-
bounces@xxxxxxxxxxxx] On Behalf Of Joe Pluta
Sent: Wednesday, April 16, 2008 9:27 AM
To: Midrange Systems Technical Discussion
Subject: Re:

Joe Pluta wrote:
And not to be contrary, but by far the easiest way to do this would be
to read the file sequentially by key and compare the key to the previous
key plus one. If it doesn't match, previous key plus one is your
answer. Start previous key at zero.


True, however depending on the range of keys, the SQL may perform faster.

If he's only interested in 1-10, it doesn't matter.

If he's interested in 100,000 - 500,000, then the question becomes where does the missing key fall?
If it's at 100,005, then the RPG will find it faster. If it's at 499,995 then SQL will.

If on average, the missing key falls halfway through....the RPG could be faster. Especially if you do
the following:

Build an SQL index on FIELD
Create a DDS logical containing just FIELD, and keyed on FIELD.

This way, your RPG program is bringing in the bare minimum of data. In addition, the logical will
share the access path from the SQL index, so the data will be brought into memory in 64K(?) chucks,
which will provide a big performance boost.

HTH,
Charles




This e-mail transmission contains information that is intended to be confidential and privileged. If you receive this e-mail and you are not a named addressee you are hereby notified that you are not authorized to read, print, retain, copy or disseminate this communication without the consent of the sender and that doing so is prohibited and may be unlawful. Please reply to the message immediately by informing the sender that the message was misdirected. After replying, please delete and otherwise erase it and any attachments from your computer system. Your assistance in correcting this error is appreciated.





Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2014 by MIDRANGE dot COM and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available here. If you have questions about this, please contact