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query problem

 
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nadh
Intermediate


Joined: 08 Oct 2004
Posts: 192
Topics: 89
PostPosted: Thu Feb 10, 2005 9:47 am    Post subject: query problem Reply with quote
Code:

SELECT PTY_ID
      ,ACCT_CO_CD
      ,CHK_DIG
      ,PTY_SUR
  FROM DB2.TA02513A
 WHERE PTY_ID >=:W-VAL1-SSA1-DB75B
   AND PTY_ID < :W-VAL2-SSA1-DB75B
 ORDER BY SUBSTR(PTY_ID,11,2)
 OPTIMIZE FOR 16 ROWS


for this i got a coment from dba as
About, the TA02513A-CURP2, the usage of OPTIMIZE for 16 Rows is in conflict with the sort !!

I did not understand what he is asking... cant we use optimize and sort in one query?

pls. any one help me out.

thanks in advance.
nadh
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kolusu
Site Admin
Site Admin


Joined: 26 Nov 2002
Posts: 12378
Topics: 75
Location: San Jose
PostPosted: Thu Feb 10, 2005 10:17 am    Post subject: Reply with quote
Nadh,

Check this link which explains in detail about using OPTIMIZE and ORDER by in the same query with examples.

http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/DSNAGH10/5.8.7.2?SHELF=&DT=20010212102121&CASE=

Hope this helps...

Cheers

Kolusu
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SureshKumar
Intermediate


Joined: 23 Jan 2003
Posts: 211
Topics: 21
PostPosted: Thu Feb 10, 2005 11:19 am    Post subject: Reply with quote
Nadh,
ORDER BY will invariably retrieve the entire result and sort it by the criteria. Optimize will be of no significant help here. If its expensive, work on the business requirements, using Index sort or verify if you would need a clustering index..etc.
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