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DB2 query with performance improvements

 
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prabhu_mf
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PostPosted: Mon Dec 08, 2014 10:18 pm    Post subject: DB2 query with performance improvements Reply with quote

Hi All

I have a query which takes more time for execution and which leads to my program run for a longer time.

Code:

SELECT DISTINCT T3.FILEDV1,T3.FILEDV2,T3.FIELDV3,T3.FIELDV4,
       T3.DATEID1,T3.INUMBER,T3.FIELDV5                     
   FROM OPR63_MTABLE1 T3,                           
        OPR02_MTABLE2 T2,                             
        OPR29_MTABLE3 T9                             
  WHERE T3.ICUSCNO=:CUSTOMER.CNUMBER                             
    AND T3.LEDREC = '42'                                     
    AND T3.DATEID1 IN (T9.DATEID1, T2.DATEID1)       <-- this line causing performance issue         
    AND T3.INUMBER=:CUSTOMER.INUMBER;


in the query,

Code:
AND T3.DATEID1 IN (T9.DATEID1, T2.DATEID1) 


this line causes the issue and take more time for processing. when code like

Code:
AND T3.DATEID1 IN (T2.DATEID1)
or

Code:
AND T3.DATEID1 IN (T2.DATEID1),


processing time is less than a sec.

could you guide me how I can improve this query.
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dbzTHEdinosauer
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PostPosted: Mon Dec 15, 2014 8:43 pm    Post subject: Reply with quote

have you tried:

Code:
and (  (t3.dateid1 in t9.dateid1) or (t3.dateid1 in t2.dateid1) )


or

Code:
and (  (t3.dateid1 in t2.dateid1) or (t3.dateid1 in t9.dateid1) )

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