Answer Posted / nygrande
DBDGEN control statements consists of Assembler Language
macro statements. The macros are supplied by IBM in a
library named IMSVS.MACLIB. DBDGEN control statements are
normally coded by the DBA and submitted to the system with
JCL. That invokes a cataloged procedure usually called
DBDGEN. The DBDGEN procedure causes the DBDGEN control
statements to the processed by the assembler producing the
object module. The object module is then passed to the
linkage editor which, in turn, stores a load module in
another IMS Library called as IMS.DBDLIB or IMSVS.DBDLIB.
The DBD process is normally preformed only once for a
database. All applications use the DBD in accessing the
information on the database. A new DBD is normally created
only if the physical nature of the database changes.
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