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Answer Posted / nygrande
PSB - Program Specification Block defines the programs view
of the database and application programs access authority to
database. It defines the logical data structure. A PSB is
made up of one or more PCBs (Program communication blocks).
PCB - Program Communication Block defines which database the
program will access and the type of access allowed. It is
defines the programmer's view of the database.
ACB - Application Control Block is an internal control block
consisting of combined information from the DBD and PSB.
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