Setting up the database resource adapter (DRA) for IMS access

InfoSphere® Classic CDC for z/OS® requires the use of the database resource adapter (DRA) interface on the source server for IMS access.

About this task

Work with your IMS system administrator or system programmer to set up the DRA. The source server uses the IMS DRA interface to communicate with the source IMS subsystem for refresh processing. The DRA is also used for mapping verification of delimited and non-delimited subscriptions.

The default load module for the DRA, DFSPZP00, is in the IMS.SDFSRESL library. The remainder of the DRA modules reside in a load library that is dynamically allocated by DFSPRRC0 (the startup). The default DDNAME and DSNAME of the load library (IMS.SDFSRESL) are specified in the default startup table DFSPZP00. DFSPZP00 contains default values for the DRA initialization parameters.

You must also configure a DRA service that references the DRA startup table in the source server.

Note: This service does not apply to publishing changes for delimited format subscriptions to WebSphere® MQ.

Procedure

  1. Code a new start-up table. Name it, for example, DFSPZP01. You might want to use DFSPZP00 as an example.
  2. Specify the required values.
  3. Copy any unchanged values from the default table.
    1. Set a value of at least 3 for MINTHRD.
    2. Set a value of 5 for MAXTHRD.
  4. Assemble and link the new module into a load library. If the new module is named DFSPZP01, the IMS DRA initialization, DRATABLESUFFIX configuration parameter, specifies a value of 01 in the DRA startup-table suffix.

What to do next

For information about DFSPZP00 see the IMS documentation about installation and customization. For information about using the DRA start-up table to optimize performance, see the CICS documentation about performance.