Converting HDAM and HIDAM databases to HALDB

You can convert an HDAM or HIDAM database to a HALDB database by using the IMS base utilities.

For a logical view of HDAM and HIDAM databases before and after changing to PHDAM and PHIDAM, respectively, see the following figure.

Figure 1. HDAM and HIDAM databases before and after changing to PHDAM and PHIDAM
HDAM before: data sets. After: PHDAM database or partition with data sets and ILDS. HIDAM before: data sets and HIDAM index. After: PHIDAM database or partition with data sets, ILDS, and index.
Restriction: HALDB support for logical relationships does not include support for virtual pairing. When converting a logically related database to HALDB, you can convert the logical relationships as follows:
  • Unidirectional relationships in the database being converted can remain unidirectional in the HALDB database.
  • Physically-paired logical relationships in the database being converted can remain physically-paired in the HALDB database.
  • Virtually-paired logical relationships in the database being converted can be converted to physically-paired in the HALDB database.

Installations which have database requirements answered by HALDB should convert those databases to HALDB. You do not need to convert existing databases which do not require greater capacities and do not need shorter reorganization outages.

In addition to the basic steps for converting a database to HALDB, this section also contains the steps for converting a database with a secondary index to HALDB, and the steps for converting databases with logical relationships to HALDB. Each of these tasks, as well other concepts and issues related to the conversion process, are covered in the following topics.