Customizing VSAM RRDS Roll Files

This document describes the customization of VSAM RRDS roll files.

It covers the following topics:

This section does not apply if you are using the Natural Roll Server.

Increasing the Number of VSAM RRDS Roll Files

Up to nine VSAM RRDS roll files can be allocated. Each roll file has an ID consisting of a user-defined prefix followed by a fixed suffix. The prefix can be 1 to 9 characters long. The suffix consists of two characters from R1 to R9.

To add a new VSAM roll file, perform the following steps:

  1. Create an empty VSAM RRDS conforming to your local site standards. Then initialize the data set using the batch program NCISCPRI, which must have been assembled during the Natural installation.The SPACE and RECORDSIZE attributes can differ between different roll files, so you can modify them as required to find the best values in your environment.

  2. Create an FCT entry and change the CICS JCL accordingly, using the prefix/suffix for both.

The new roll file becomes available when Natural CICS Interface is initialized again.

Decreasing the Number of VSAM RRDS Roll Files

Perform the following steps:

  1. Ensure that Natural is not active.

  2. Either delete the FCT and JCL definitions or delete the file.

The number of roll files is adjusted when Natural CICS Interface is initialized again.

Changing the Characteristics of the VSAM RRDS Roll Files

Perform the following steps:

  1. Execute the procedures described above for decreasing the number of roll files.

  2. Execute the procedures for increasing the number of roll files.