Re: AW: DDL Discussion continued

[Doug Palme <DPalme@xxxxxxxxxxx>]

   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,
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