Converting logically related HDAM or HIDAM databases to HALDB

Converting logically related HDAM or HIDAM databases to HALDB PHDAM or PHIDAM is similar to converting a simple database to HALDB; however, HALDB support for logical relationships might require changes to your logical relationships and all of the logically related databases must be converted to HALDB at the same time.

Create image copies of your database data sets and back up your RECON data sets and your existing DBD definitions.

In addition to the steps for converting logically related databases to HALDB, this section describes the concepts and issues that you should consider before beginning the conversion process.

Databases that are logically related to each other must be converted to HALDB at the same time. IMS does not support logical relationships between HALDB and non-HALDB databases.

HALDB supports only two types of logical relationships: unidirectional and bidirectional with physical pairing. HALDB does not support virtual pairing. You must convert bidirectional logical relationship that use virtual pairing to bidirectional logical relationships that use physical pairing.

HALDB does not use symbolic pointers or hierarchical pointers. HALDB PHIDAM databases do not support the use of twin forward only pointers (TWIN or T).

You do not need to change the DBDs for logical databases when the physical databases that they reference are migrated. DBDs for logical databases have ACCESS=LOGICAL in their DBD statements.