A database instance is represented by one or more segments. A segment definition describes the physical attributes of a database such as how data is stored on Direct Access Storage Devices (DASD) and how much space the database contains.
Segments are included into a DMCL, a component used at run time to define the universe of databases accessible by a CA IDMS run-time environment (either local mode or central version). Each run-time environment uses a single DMCL load module generated from a DMCL source definition residing in a system dictionary.
A DBTABLE optionally groups segments into DBNAMEs. A DBNAME enables multiple segments to be accessed together as a single database. A DMCL identifies the DBTABLE with which it is associated and like DMCLs, DBTABLEs are generated into load modules for use at runtime.
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