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Status Future consideration
Workspace IMS System Services
Categories General System
Created by Guest
Created on Jun 27, 2022

RELATED IDEAS

Reducing IMS/Db2 connection pooling thread footprint of an MPP when RLA=Y

Details

When RLA=Y (PH33024) is set there is an opportunity to enhance IMS/Db2 connection pooling (DSNMIN20) . Right now IMS connection pooling modules DFSESAT0 and DFSESCT0 hand over PSTUSID as EEVPUSID to Db2 . Db2 uses this userid as first part of the 16 bytes key that is used for pooling up to 50 threads per MPP (see fields WALAID and WALP_POOL_KEY in Db2 control block WAL that is mapped in SDSNIVPD(DSNWCBDZ) and can be located as CDE name WAL in the MPP) . If the logic of PH33024 is extended to DFSESAT0/DFSESCT0 and EEVPUSID is set to the userid of the dep. region ACEE for RLA=Y then the first 8 bytes of WALP_POOL_KEY ( i.e. WALP_USER_ID) becomes fixed per MPP.

Business justification

Proposed code change together with RLA=Y reduces the pooling thread footprint of a single MPP i.e. the contribution to overall thread growth in Db2 that pooling brings along.

On the one hand more plans per MPP can be pooled.

On the other hand more MPPs can exploit connection pooling with the same overall thread footprint in Db2 compared to as-is-world .

Of course the milage of each IMS installation may vary according to the variety in their PSTUSIDs. For FI having more than 50 ISC-LTERMS per IMS is the main reason for proposed code change being a goodie.

Idea priority High
  • Guest
    Reply
    |     Sep 13, 2022
    Thank you for your interest in keeping IMS a vital and successful product. Software development has continuously evolved during IMS's lifetime, and so has IMS itself. We have kept pace with, adopted, and implemented many industry standard best practices within our organization, including Continuous Delivery, Design Thinking, and Agile.

    When choosing new features to add from the list of requirements in our backlog, we assess which will bring the most value to as many clients as possible and prioritize those.

    After reviewing this request for enhancement and assessing its potential value, our decision is to add this item to our backlog. Items in our backlog are expected to start in the next 18 months. We reserve the right to re-prioritize our backlog items as new requests come in. This helps ensure that we are constantly focused on providing the best value to all of our clients.

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