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Mainframe Fundamentals: COBOL, JCL, and VSAM
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READ PHYSICAL is less effecient then READ LOGICAL
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A
False
💡 Explanation:
READ PHYSICAL is actually MORE efficient than READ LOGICAL in Adabas. READ PHYSICAL accesses records directly by their ISN (Internal Sequence Number) without using the inverted list indexes. READ LOGICAL requires index lookups to find record ISNs first, making it slower for direct access.