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Status Future consideration
Created by Guest
Created on Feb 3, 2021

Improve performance of queries with correlated subqueries in IDAA v7

Queries with correlated sub-queries where index access is involved will generally run faster on Db2z then on IDAA v7.

Since IDAA v7 supports correlated subqueries, these queries are generally offloaded to IDAA, although they may run significantly slower on IDAA.

Thus, the offload-decision process by the Db2 for z/OS optimizer need to be more fine-grained. If a correlated subquery runs a few seconds on Db2 for z/OS using index access, and several minutes on IDAA, the query should not be offloaded.

Alternatively, Db2 Warehouse needs to be enhanced so that these queries run faster on IDAA can thus be offloaded to IDAA as well.

This request is a result of performance issues which described in cases TS004225008 & TS004552600.

Needed by Date Mar 1, 2021
  • Admin
    Dennis Lukas Mayer
    Feb 12, 2021

    We currently consider to provide an option to keep selected queries in Db2 for z/OS instead of offloading to the Accelerator.

  • Guest
    Feb 4, 2021

    This request is very important. I support this request, and hope it will be approved ASAP.