RE: Join Logical File Problem -- MIDRANGE-L

Raj, 

You are correct, you cannot use the fields from the secondary files as keys
in a join access path. However, the OPNQRYF should perform well, if tuned.
Can you post the DDS (or SQL) that was used to create file 1, 2 and 3? I'd
be interested to see which of your key fields come from which files. If the
correct LFs are build over files 1, 2 and 3 OPNQRYF will *usually* not need
to build an index to select the records, but rather to order them. Can you
also try running this query with debug on (STRDBG) and see what messages the
query optimizer returns? Finally, what version of the operating system are
you on?

-Walden

-----Original Message-----
From: Rajan.Srinivasan@Allfun.com [mailto:Rajan.Srinivasan@Allfun.com]
Sent: Friday, December 18, 1998 10:14 PM
To: MIDRANGE-L@midrange.com
Subject: Join Logical File Problem


Hello  All,
                         We   are   trying   to  replace  an  Open   Query
File  with   Join  Logical  File  and  got  struck.  Any help is
greatly  Appriciated.




 IN  BRIEF  :      JOIN  LOGICAL FILE  -   Not allowing  to have  Key field
from  Secondary  File fields.

We  are  using  the  Open Query  File.  We are trying  to  take out the
Open Query file, ( which generates the acceess path
every time, which takes long time ),  and  use   Join Logical file with
the relavent Key list.


IN  DETAIL. :

We  are showing a  selection  screen , of which  the  user can select  19
different  selection creteria to
print the report  in  19  different ways.  It is being  called and
executed from  a  CL  to  RPG.


The data is being taken from  3  Physical  files.

On  CL,  depends on the user selection,  we  run  Open Query ,  ( which is
joining  three  PF ,  and putting into an another PF),
and  that PF  is being used in  the  RPG.


" We want  to  take out the  Open Query, and  create 19 different  join
Logical file ( to join all 3  PF ) ,  with  Selection  creteria  and  with
Key Field"  and  use the join  logical file to generate the report."


PROBLEM.
                         I can able to create  19  different   LF,  over
3  different  PF.    But,   """" The Key filed used on the open query is
taking fields   from  all  three  PF,  instead of  only  from  the  Primary
fille."

                        I  read in the  manual that  "  I can  use  only
the fields  from the Primary file  for the Key field ", which is correct
because when I use  fields from secondary files  for Key field,  I am
getting a compile time error.

WHAT WE WANT TO DO
Basically we want to ellimate the process  to generate the access path  (
to take out the open query file from CL ) every time  when the user select
any option to generate the report.


Actual  Open Query  File  statement  in CL

OPNQRYF    FILE((FILE 1) (FILE 2) (FILE 3)) +

                          FORMAT(CRTPF1) QRYSLT('(X090 *EQ  "R")')

                          KEYFLD((XR180) (XR070) (XR110) (XA133) (XA131)
(XA010) (CHKDIG)   (ICLASS))

                          JFLD((ALOAN DLOAN) (CLOAN DLOAN))

                          JDFTVAL(*YES) MAPFLD((ALOAN 'A2LOAN' *CHAR 10)
(MR010 'SMR010' *CHAR 9) (HKDIG 'CHKDIG' *CHAR 1) (DLOAN 'MR010 +

                         *CAT HKDIG' *CHAR 10) (CLOAN 'ILOAN' *CHAR 10))





Any  help is greatly appriciated.

Thanks in advance

Raj




















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