DBRC groups

When more than one DBRC accesses the same RECON data set in an IMSplex environment, they are considered a DBRC group.

The group:

Is identified by a DBRC group ID.
Can access the shared RECON data set in serial or parallel mode.
Is supported in IMS Version 10 and later.

A DBRC group ID can be specified in the CHANGE.RECON command. You can view the DBRCGRP in the QUERY IMSPLEX command in the subtype column.

Restriction: DBRCs in the same IMSplex that use different RECON data sets must use different DBRC group IDs when parallel RECON data set access is being used.

Recommendation: If serial RECON access is being used in the IMSplex, DBRCs in the same IMSplex that use different RECON data sets can use the same DBRC group ID, but doing so is not a good idea. When one RECON data set encounters an error, automatic RECON loss notification processing is performed by all DBRC instances in the IMSplex with the same DBRC group ID, thus adding processing overhead to the DBRC instances that are not using the RECON data set in error. Using different DBRC group IDs avoids this additional processing overhead.