Data Capture exit routines

If your installation contains both IMS DB and Db2 for z/OS® databases, duplicating data in IMS DL⁄I and Db2 for z/OS relational databases might be required.

For example, your Db2 for z/OS application programs, written in Structured Query Language (SQL), might require data from the IMS DB database. You might be converting your site to Db2 for z/OS on a gradual basis, or you might want to take advantage of the relational technology of Db2 for z/OS for some of your IMS data.

To duplicate data between the two types of databases, you must ensure that each update to data segments occurs in both databases in a timely manner. The process of duplicating updates from an IMS DB database to a Db2 for z/OS database is known as data propagation.

The two ways to propagate data from IMS DB to Db2 for z/OS are:

IMS DataPropagator, an IBM® licensed program that provides support for data propagation and for exit routines.
Data Capture exit routine. This is an exit routine that you write to establish a routine for data propagation. It can be written in assembler language, C language, COBOL, or PL⁄I, and it is called by an application program that requires data propagation.

Note: The Data Capture exit routine is not available to CICS®. DBCTL can use the exit routine, but only for BMPs.

Related reading:

For information about system requirements for data propagation, see IMS Version 15.3 System Definition.
For information on the database considerations associated with the Data Capture exit routine, IMS Version 15.3 Database Administration.
For information on writing a Data Capture exit routine, see IMS Version 15.3 Exit Routines.
For more information about IMS DataPropagator, see:
- IMS DataPropagator for z/OS: An Introduction
- IMS DataPropagator for z/OS Concepts