Overview of IDMS

IDMS is a network database management system that is accessed by a subschema (the equivalent in FOCUS is a Master File). IDMS provides two methods of retrieving records within a subschema from an application program, DML (network access) and LRF (LRF-based access).

DML access is the traditional method of IDMS database navigation. It is the network navigation facility. Each physical record is retrieved separately. An application program enters the IDMS data source at a particular IDMS record-type (the equivalent in a Master File is a segment) and searches the set connections to retrieve the required data. See Network Concepts for concepts that apply to network record-types.


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