Altering a HALDB database that has logical relationships

If a HALDB database is logically related to another database, you can use the HALDB online alter function to modify any segment in the database except for logical parent or logical child segments.

If you need to alter a segment that is a logical parent or logical child, you must take both databases offline so that you can apply the changes to both databases at the same time by using the HD Reorganization Unload utility (DFSURGU0) and the HD Reorganization Reload utility (DFSURGL0). The online alter function for HALDB databases can apply changes to only one database at a time.