JOB_GROUP_CLEAN=Y | N
If JOB_GROUP_CLEAN = Y, implicitly created job groups that are empty and have no limits assigned to them are automatically deleted.
Job groups can only be deleted automatically if they have no limits specified (directly or in descendent job groups), have no explicitly created children job groups, and haven’t been attached to an SLA.
N (Implicitly created job groups are not automatically deleted unless they are deleted manually with bgdel.)