Partitions in PHDAM, PHIDAM, and PSINDEX databases

You can view a HALDB database, whether it is a PHDAM, PHIDAM, or a PSINDEX database, as a single database whose records are divided into manageable sections called partitions.

A partition is a subset of a HALDB database. The maximum size of a partition depends on the maximum number of data sets per partition and the maximum size of the data sets.

In many cases, each partition can be administered independently from the other partitions in the database. The division of records across partitions in a HALDB database is transparent to application programs, unless you choose to process partitions selectively.

HALDB partitions include unique features that allow IMS to manage them and that make them easier for you to use, as well. The HALDB partition structure also offers unique functions that are unavailable with non-partitioned databases, such as selective partition processing.