IBM Support

MA47502 - OSP-DB-OTHER-PERFM PERFORMANCE IMPROVEMENT TO QDS IO COSTING

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 APAR (Authorized Program Analysis Report)

Abstract

OSP-DB-OTHER-PERFM PERFORMANCE IMPROVEMENT TO QDS IO COSTING

Error Description

Performance improvement to QDS IO Costing                      

Problem Summary

Please see the ERROR DESCRIPTION section.                      

Problem Conclusion

The IO costing model for temporary objects (QDSs) used the      
SQE optimizer is changed to start the IO costing curves sooner.
This change in IO cost behavior is enabled by setting the      
QAQQINI option SERVICE_AQ to *YES. When this INI option is      
enabled, the SQE optimizer will start costing IOs for the      
temporary objects at the smaller of 300M or at the query fair  
share. This will in general bias the optimizer towards index    
plans.                                                          

Temporary Fix

Comments

Circumvention


PTFs Available

R720 MF65924 PTF Cover Letter   9297
R730 MF65717 PTF Cover Letter   9311

Affected Modules

         
         

Affected Publications

Summary Information

Status............................................ CLOSED PER
HIPER........................................... No
Component.................................. 9400DG3DB
Failing Module.......................... RCHMGR
Reported Release................... R730
Duplicate Of..............................




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Document Information

Modified date:
15 November 2019