Multiple choice technology mainframe

CONTROL BLOCKS ARE?

  1. PCB

  2. PSB

  3. ALL THE ABOVE

  4. NONE
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In IMS, PSB (Program Specification Block) is the control block that defines which database(s) a program can access and which segments it can use within those databases. A PSB contains one or more PCBs (Program Communication Blocks). While PCB is a control block, PSB is the broader, more comprehensive answer and better represents 'control blocks' in the plural sense. Option B (PSB) is the best answer as it encompasses the complete set of control blocks.

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