There are various speed implications here. 1) The speed of the actual generation of the OPNQRYF versus the actual generation of the logical file, or view. 2) The speed of access using the file via OPNQRYF versus the speed of access using the logical file. 3) The sum total of 1 & 2 done via OPNQRYF versus using a logical file. 4) Any performance implications of leaving a logical file out there might have on database updates. (I have a 1998 copy of the AS/400 Experts journal Volume I, Number I on my desk. It has an article in there by Skip Marchesani in which he states that it is a MYTH to believe that "logical files on a file are resource intensive, have a negative impact on performance, and should only be used when absolutely necessary". He goes on to state that IBM cleaned this up on V2 of OS/400 and even better in V3 of OS/400. Others say they have testing that disputes Skip's statements.) If 4 doesn't prove to be a concern in your environment then item 1 drops out of the picture if you leave the logical file out there. This will, in turn, shorten item 3. But if you're deleting/rebuilding the logical file all the time you're probably losing any performance improvement. Rob Berendt -- Group Dekko Services, LLC Dept 01.073 PO Box 2000 Dock 108 6928N 400E Kendallville, IN 46755 http://www.dekko.com "Dwayne Allison" <Dwayne.Allison@xxxxxxxxx> Sent by: midrange-l-bounces@xxxxxxxxxxxx 10/06/2004 10:30 AM Please respond to Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx> To "Midrange Systems Technical Discussion" <midrange-l@xxxxxxxxxxxx> cc Fax to Subject compare using qry or logical We are using the following command: OVRDBF FILE(PA0PBR) TOFILE(PASPBR) SHARE(*YES) OPNQRYF FILE((PASPBR)) QRYSLT('ARBGRP *EQ "*C*"') Is it quicker to create a logical file with a select ARBGRP that equal *C only or use the above query? -- This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list To post a message email: MIDRANGE-L@xxxxxxxxxxxx To subscribe, unsubscribe, or change list options, visit: http://lists.midrange.com/mailman/listinfo/midrange-l or email: MIDRANGE-L-request@xxxxxxxxxxxx Before posting, please take a moment to review the archives at http://archive.midrange.com/midrange-l.
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