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Status Not under consideration
Workspace Db2 Analytics Accelerator for z/OS
Created by Guest
Created on Feb 3, 2020

RELATED IDEAS

force the execution of a query on an accelerator if more than one is available.

The CURRENT ACCELERATOR special register specifies a preferred target accelerator or accelerators to which Db2 sends dynamic SQL queries.
But If you have multiple accelerators on which the same set of Db2 tables are accelerated, by default the workload balancing algorithm (WLB) distributes the queries based on the queue length on each accelerator. When the CURRENT ACCELERATOR special register names a particular eligible accelerator server, Db2 considers sending eligible SQL to that server before it sends it to other accelerator servers. But If the accelerator server that is named by the CURRENT ACCELERATOR isn't available, Db2 considers other available accelerator servers.

MY REQUEST: Create  new special register, for sample: CURRENT FORCE ACCELERATOR, that forces the execution on a chosen accelerator. And If the accelerator server that is named by the CURRENT FORCE ACCELERATOR  isn't available then the query run on DB2 or fail if CURRENT QUERY ACCELERATION is set to ALL.

  • Guest
    Reply
    |     Apr 8, 2020

    Hi Dennis,

    Thanks you for your review of my idea.
    Thanks for your time and your help.

    Regards.

  • Guest
    Reply
    |     Apr 8, 2020

    It is currently not planned to add a new special register to force a query to an Accelerator but this workaround might help:

    CREATE TABLE ACCELERATORS.ACC1 (C1 INT);

    INSERT INTO TABLE ACCELERATORS.ACC1(C1) values 1;

    add ACCELERATORS.ACC1 to ACCEL1

    load ACCELERATORS.ACC1 on ACCEL1

    SET CURRENT QUERY ACCELERATION = ALL

    SELECT <your query> FROM <yourtable>, ACCELERATORS.ACC1 for fetch only

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