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2643865 - Many retry in DQP work units and slow performance case - SAP IQ

Symptom

Customer saw a DQP query processing was slow with many retries in work-units.
Below copy is part of customer's HTML Plan.

#181 Order By
Generated Result Rows 85
Estimated Result Rows 14,440,014
Fragment ID 2
Optimization Note Parallel sort load
Work Units - nodexx1 53 (1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0)
Work Units - nodexx3 32/30 (1, 1, 1/1, 1/1, 1/1, 1/1, 1/1, 1/1, 1/1, 1/1, 1/1, 1/1, 1/1, 1/1, 1/1, 1/1, 1/1, 1/1, 1/1, 1/1, 1/1, 1/1, 1/1, 1/1, 1/1, 1/1, 1/1, 1/1, 1/1, 1/1, 1/1, 1/1, 0)
Max. Possible Parallel Arms 96
Max. Active Parallel Threads 85
Parallel Sink Work Units 85
First Worker Work Unit 29

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Environment

SAP IQ 16.0

Product

SAP IQ 16.0

Keywords

"Retry work unit" ; "Retry workunit" ;"Retry work-unit" ;"DQP retry" ; , KBA , BC-SYB-IQ , Sybase IQ , How To

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