Multiple choice technology mainframe

How many data buffers are allocated to VSAM ESDS?

  1. 1

  2. 2

  3. 3

  4. 4
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B Correct answer
Explanation

VSAM ESDS (Entry Sequenced Data Set) typically allocates 2 data buffers for efficient sequential processing - one buffer for input operations and one for output operations, enabling smooth sequential I/O.

AI explanation

VSAM Entry-Sequenced Data Sets (ESDS) are allocated 2 data buffers by default (there's no index component in ESDS, unlike KSDS which also needs index buffers). These two buffers support read-ahead/write-behind buffering for sequential and direct processing efficiency. Allocating only 1 buffer would prevent any double-buffering performance benefit, while 3 or 4 buffers aren't the VSAM default allocation for ESDS (extra buffers can be requested via BUFND/AMP parameters, but the baseline default is 2).

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