ddd ims data
Overview of IMS Databases. An IMS database is a large, centralized collection of information comprising one or more physical files that can be accessed by the SAS/ACCESS interface to IMS. An IMS database is a hierarchical database. Information is structured in records that are subdivided into a hierarchy of related segments. A record is a root segment and all of its dependent segments. Segments are further subdivided into fields. The data in any record relates to one entity.