Note that from RPG logic perspective this type of access will be viewed as
arrival (non-keyed) sequence, while DB2 engine may or may not use an index
to build the result set that satisfies view's selection criteria.
Elvi
RPG & DB2 Summit | Minneapolis | October 1-4
Mike Cain - DB2 for i5/OS Temporary Indexes - The Good, The Bad, The Ugly
October 16
2007 System i Fall Technical Conference | Orlando | November 4-7
Celebrating 10-Years of SQL Performance Excellence on IBM System i, eServer
iSeries and the server affectionately known as the AS/400
-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of AGlauser@xxxxxxxxxxxx
Sent: Tuesday, September 11, 2007 3:35 PM
To: Midrange Systems Technical Discussion
Subject: RE: CREATE INDEX and name only some columns
Jeff Crosby wrote on 11/09/2007 16:29:13:
Yes I need it for native I/O. I'll figure out another way. But I _AM_
going to define this file via DDL.
I think you could attain your goal by just creating the view, and using
that in your native I/O. As Eric mentioned, the SQL engine may use an
index over the table the view uses, so I'd suggest creating the view that
gets the data the way you'd like it presented to the HLL, then creating a
program that opens the file and reads it. If you run the program in
debug, I think you will get some information about what the SQL engine is
doing in the background to open the view - which should suggest an index
creation if an index would be useful.
HTH,
Adam
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