COBOL ⭐ Featured
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Q: How does SEARCH ALL differ from SEARCH?

Answer:
SEARCH performs a sequential/linear search from the current index position. SEARCH ALL performs a binary search requiring the table to be sorted (ASCENDING/DESCENDING KEY clause) and indexed. SEARCH ALL is faster for large tables but requires sorted data.
search tables performance
VSAM
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Q: What is LINEAR dataset?

Answer:
LINEAR VSAM is byte-addressable. No record structure. Used by DB2 tablespaces, system software. DEFINE CLUSTER LINEAR. Accessed via DIV (Data-in-Virtual) or memory mapping.
linear byte-addressable special