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Status Not under consideration
Workspace Db2 for z/OS
Created by Guest
Created on Nov 14, 2023

RELATED IDEAS

High CPU utilisation in CF structure xxxx_SCA

We have noticed that the structure DB2P_SCA in production the reason for high CPU consumption in the Coupling Facility is.
Our reporting proofs this behaviour.

We opened a case and did a deeper dive with IBM’s experts into.

At the end we can say that every XA transaction manager, like

  • Oracle Weblogic: every 5 minutes

  • Bealogic JBoss: every 2 minutes

  • Bitronix: every 60 seconds

  • Atomikos: every 10 seconds(our environment)

calls the “recover method” to compare its own list of 'open' transaction IDs with the database's list of 'prepared' XIDs(XIDLIST) held in DB2P_SCA for every application instance.

By application instance we mean a Java process - i.e. in the 'traditional' sense a WebSphere ApplicationServer instance. We have a lot of them.

  • 200 productive LAS server instances alone, which make a recovery() call once every 10 seconds.

  • Plus all remaining tower applications in Production.

During the investigation it was found that the behavior we noticed is not actually a Code Bug, but that there is still room for improvement to make reading open XIDs much more efficient.

This is very interesting for all customers, who are working with DataSharing.

Needed By Quarter
  • Admin
    Janet Figone
    Reply
    |     Apr 11, 2024

    Dear Michael,

    Thank you for submitting this Db2 for z/OS enhancement request. We have reviewed this request but since it does not align within functionality prioritized for delivery within the next 12 months. unfortunately, we will not be considering this idea at this time.

    We appreciate your input to the Db2 for z/OS development team. We hope that you will continue to submit enhancement suggestions for improvements as customer feedback is a key component to shaping the future direction of Db2 for z/OS.

    Sincerely,

    Db2 for z/OS Team

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