Re: More efficient way to write this SQL Statement???

[Bryce Martin <BMartin@xxxxxxxxxxxx>]

Yeah, already did Visual Explain and I have all the right indexes.

Just to let you all know, I really appreciate the help.  Unfortunately 
after I got it all working and doing awesome.... the spec changed and I 
don't even need it.  Oh well.  I learned something new :D


Thanks
Bryce Martin
Programmer/Analyst I
570-546-4777



Charles Wilt <charles.wilt@xxxxxxxxx> 
Sent by: rpg400-l-bounces@xxxxxxxxxxxx
02/11/2011 08:43 AM
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RPG programming on the IBM i / System i <rpg400-l@xxxxxxxxxxxx>


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Re: More efficient way to write this SQL Statement???






Bryce,

Make sure you at least have indexes on est(tcust, tship, stadtp) and
rcm(ccust)...

Select Cast(tcust As Numeric(6,0)), tship, stadtp, tname,
           tadr1,tadr2, tadr3, tste, tpost, tphone
> From est join rcm on tcust = ccust
where
     (tadr3 = '' or tadr3 = :cszESTCity)
  and (tste = '' or tste = :cszESTState)
  and (tpost = '' or tpost = :cszESTZip)
  and (tid = 'ST')
  and (cad3 = '' or cad3 <> :cszESTCity)
  and (cste = '' or cste <> :cszESTState)
  and (czip = '' or czip <> :cszESTZip)
  and (cmid = 'CM')
Order By tcust, tship, stadtp;

Do a visual explain on the above and see if any additional indexes are
recommended.

Also read this:
https://www-304.ibm.com/partnerworld/wps/servlet/ContentHandler/servers/enable/site/bi/strategy/index.html




HTH,
Charles


On Thu, Feb 10, 2011 at 4:59 PM, Bryce Martin <BMartin@xxxxxxxxxxxx> 
wrote:
> I have a static sql statement I'm using in an SQLRPGLE program.  It 
takes
> about 20 seconds to execute and I need to make it faster if at all
> possible...any suggestions will be greatly appreciated...
>
> Here is the statement...
>
>         Exec SQL
>          Declare CSZEST1 Cursor For
>           Select Cast(tcust As Numeric(6,0)), tship, stadtp, tname,
> tadr1,
>                  tadr2, tadr3, tste, tpost, tphone
>           From est
>           Where tcust not in(Select ccust
>                              From rcm
>                              Where cad3 = (case when :cszESTCity <> ''
>                                                 then :cszESTCity else
> cad3 End)
>                                and cste = (case when :cszESTState<>''
>                                                then :cszESTState else
> cste End)
>                                and czip = (case when :cszESTZip <> ''
>                                                 then :cszESTZip else 
czip
> End)
>                                and cmid = 'CM')
>             and tadr3 = (case when :cszESTCity <> ''
>                            then :cszESTCity else tadr3 End)
>             and tste = (case when :cszESTState <> ''
>                           then :cszESTState else tste End)
>             and tpost = (case when :cszESTZip <> ''
>                            then :cszESTZip else tpost End)
>             and tid = 'ST'
>           Order By tcust, tship, stadtp;
>
> The data is structured as follows.  There are 2 files, RCM and EST.  RCM
> is the customer master and EST is the address master for customers.  So
> the key from RCM to EST is CCUST = TCUST.
>
> TSHIP and STADTP together with TCUST form a unique record.  What happens
> is the user can specify a City, State, and/or Zip.  If they are not 
blank
> I need to use them as inclusion criteria.  What I want are any records 
in
> EST that meet the City/State/Zip criteria where the master RCM record 
does
> not.
>
> I hope this is enough clear info.
> Thanks
> Bryce Martin
> Programmer/Analyst I
> 570-546-4777
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