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Status Delivered
Workspace Db2 for z/OS
Created by Guest
Created on Apr 28, 2015

Performance Optimization for Java IMS

In a Java Cobol Mix Environment:
Reusing connections to databases and using Connection pools has become a quasi standard in all "application server" environments, especially when application servers use connections to databases to ensure transactional behaviour.
Assuming the connection pooling for accessing DB2 is active in IMS, there is the option "KEEPDYNAMIC Yes" in DB2 to keep allocated Database resources (such as cursors, statements and prepared statements) over transaction boundaries (reuse after commit).
As of today KEEPDYNAMIC yes does not work over transaction boundaries in IMS.
For performance and CPU usage reasons, an option to set KEEPDYNAMIC yes (assuming the connection pooling for accessing DB2 is active in IMS) is requested for the IMS TM application server when it uses DB2 on z/OS as the database.
  • Guest
    Jun 17, 2019

    Hi, Janet. This Idea has been delivered by DB2 for z/OS APARs PI61982 and PI61983 for V11, PI74192 and PI74193 for V12.

    Jim Pickel
    Senior Technical Staff Member
    Db2 for z/OS Development
    Security and Connectivity
    Silicon Valley Laboratory

    mobile: 408-497-6320