Re: AW: DDL Discussion continued

[Doug Palme <DPalme@xxxxxxxxxxx>]

   I have seen some refer to indexes as similar to a keyed logical file,
   which certainly makes sense to me....however can you not also do the same
   thing with a view? IE: Use Order By in a view statement?

   From:     Doug Palme <DPalme@xxxxxxxxxxx>                                  
   To:       Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>  
   Date:     09/23/2008 09:58 AM                                              
   Subject:  Re: AW: DDL Discussion continued                                 

     ----------------------------------------------------------------------

      Thanks.....

     From:    "Birgitta Hauser" <Hauser@xxxxxxxxxxxxxxx>                    
      
     To:      "'Midrange Systems Technical Discussion'"                      
    
              <midrange-l@xxxxxxxxxxxx>                                      
    
     Date:    09/22/2008 11:57 PM                                            
    
     Subject: AW: DDL Discussion continued                                  
      

       ----------------------------------------------------------------------

     Hi,

     you may also read the following whitepaper which discusses how to
     determine
     and create the best access paths (either SQL indexes or DDS described
     keyed
     logical files).
     Indexing and statistics strategies for DB2 for i5/OS
    
   http://www-03.ibm.com/servers/enable/site/education/abstracts/indxng_abs.htm
     l

     Mit freundlichen Gru:ssen / Best regards

     Birgitta Hauser

     "Shoot for the moon, even if you miss, you'll land among the stars."
   (Les
     Brown)
     "If you think education is expensive, try ignorance." (Derek Bok)
     "What is worse than training your staff and loosing them? Not training
     them
     and keeping them!"

     -----Urspru:ngliche Nachricht-----
     Von: midrange-l-bounces@xxxxxxxxxxxx
     [mailto:midrange-l-bounces@xxxxxxxxxxxx] Im Auftrag von
     vhamberg@xxxxxxxxxxx
     Gesendet: Tuesday, 23. September 2008 03:59
     An: Midrange Systems Technical Discussion
     Betreff: Re: DDL Discussion continued

     Somehow got a quick hit of my palm on the touchpad on the last message -
     but
     my point was made already.

     You should read the manual that talks about optimization and access
   plans
     and all - it'll tell you why you need indexes for certain kinds of
   access
     -
     the better ones will not even be possible without an index under it. SQL
     may
     create its own index at time, if it thinks that will go faster than some
     other method.

     The link to the manual called Database Performance and Query
   Optimization,
     at V5R4, is

    
   http://publib.boulder.ibm.com/infocenter/iseries/v5r4/topic/rzajq/rzajq.pdf

     There'd be a similar manual at the other release levels.

     HTH
     Vern

     -------------- Original message --------------
     From: Doug Palme <DPalme@xxxxxxxxxxx>

     > We had our meeting this past week on DDL and I would like to get some
     > feedback from all of you....I know that some of the uses for a view is
     far

     > different than an index but if one is depending on the SQL engine to
     > determine the most efficient access path for the data, why even create
     > indexes? Is there any real advantage to creating them?
     > This transmission may contain information that is privileged,
     confidential

     > and/or exempt from disclosure under applicable law. If you are not the
     > intended recipient, you are hereby notified that any disclosure,
     copying,
     > distribution, or use of the information contained herein (including
   any
     > reliance thereon) is STRICTLY PROHIBITED. If you received this
     > transmission in error, please immediately contact the sender and
   destroy
     > the material in its entirety, whether in electronic or hard copy
   format.
     > Thank you.
     > --
     > 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.
     >
     --
     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.

     --
     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.

     This transmission may contain information that is privileged,
   confidential
     and/or exempt from disclosure under applicable law. If you are not the
     intended recipient, you are hereby notified that any disclosure,
   copying,
     distribution, or use of the information contained herein (including any
     reliance thereon) is STRICTLY PROHIBITED. If you received this
     transmission in error, please immediately contact the sender and destroy
     the material in its entirety, whether in electronic or hard copy format.
     Thank you.
   --
   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.

   This transmission may contain information that is privileged, confidential
   and/or exempt from disclosure under applicable law. If you are not the
   intended recipient, you are hereby notified that any disclosure, copying,
   distribution, or use of the information contained herein (including any
   reliance thereon) is STRICTLY PROHIBITED. If you received this
   transmission in error, please immediately contact the sender and destroy
   the material in its entirety, whether in electronic or hard copy format.
   Thank you.