RE: CREATE INDEX and name only some columns

["Wilt, Charles" <WiltC@xxxxxxxxxx>]

Why?

If you need it for native I/O, use a DDS logical.

As long as the physical file is defined with DDL, you get the important benefits of using DDL vs. DDS
including:
-Validation on Write instead of Read
-64K Access paths (when logical shares an SQL access path)

As long as you're using native I/O you're _are_ going to have to have DDS logicals.  Unless you're
writing/rewriting from the ground up to avoid the need for capabilities only available to DDS
logicals.

HTH,
Charles


> -----Original Message-----
> From: midrange-l-bounces@xxxxxxxxxxxx 
> [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Jeff Crosby
> Sent: Tuesday, September 11, 2007 4:29 PM
> To: 'Midrange Systems Technical Discussion'
> Subject: RE: CREATE INDEX and name only some columns
>
> Poop.
>
> Yes I need it for native I/O.  I'll figure out another way.  
> But I _AM_ going to define this file via DDL.
>
> --
> Jeff Crosby
> UniPro FoodService/Dilgard
> P.O. Box 13369
> Ft. Wayne, IN 46868-3369
> 260-422-7531
>
> The opinions expressed are my own and not necessarily the 
> opinion of my company.  Unless I say so.
>  
>
> > -----Original Message-----
> > From: midrange-l-bounces@xxxxxxxxxxxx 
> > [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Elvis Budimlic
> > Sent: Tuesday, September 11, 2007 4:23 PM
> > To: 'Midrange Systems Technical Discussion'
> > Subject: RE: CREATE INDEX and name only some columns
> >
> > You can't create an index over a view.
> > You can create an index over select columns from the underlying 
> > physical file (SQL table).
> >
> > If you're referring to this index looking in DSPFFD as a 
> keyed LF that 
> > lists all the fields from the underlying PF, there is no way around 
> > this.  Only fields that are keyed are the ones you list on 
> the CREATE 
> > INDEX statement, but they all show.  So if you were to 
> access this SQL 
> > index with native I/O (RPG), that's what you'd get.
> >
> > Elvis
> >
> > 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+ebudimlic=centerfieldtechnology.com@xxxxxxxxxxxx
> > [mailto:midrange-l-bounces+ebudimlic=centerfieldtechnology.com
> > @midrange.com]
> > On Behalf Of Jeff Crosby
> > Sent: Tuesday, September 11, 2007 3:17 PM
> > To: 'Midrange Systems Technical Discussion'
> > Subject: CREATE INDEX and name only some columns
> >
> > Can I create an SQL index and name the columns so that I'm only 
> > including specific columns from the base table instead of 
> all columns?
> > Or do I need to create a view, and then an index over the view 
> > (because a view can't have a 'key')?
> >
> > I've been looking for examples creating an index with specific 
> > columns, haven't found any, and therefore I think I can't do it.
> >
> > Thanks.
> >
> > --
> > Jeff Crosby
> > UniPro FoodService/Dilgard
> > P.O. Box 13369
> > Ft. Wayne, IN 46868-3369
> > 260-422-7531
> >
> > The opinions expressed are my own and not necessarily the 
> opinion of 
> > my company.  Unless I say so.
> >
> >
> > --
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