You can run a batch job to check the contents of one, some, or all of the labels in the label data set with their corresponding DBDs or DBD-type ACBs. This task is useful for discovering label mismatch problems before application programs are affected, and for re-creating the Database Integrity messages when a label mismatch problem has occurred.
In the IMS online environment, Database Integrity is invoked to verify labels only at database OPEN time. If you change control blocks with the MODIFY command and the database has not been closed, take special care to verify that the new ACB library is correct. You should check the labels against the inactive ACB library prior to the IMS MODIFY command. Consider adding the LBLCHECK job to your Online Change Utility (DFSUOCU0) procedure.