Multiple choice technology mainframe

What is BLKSIZE in DCB parameter?

  1. It is the number of records MVS System reads together when we issue read command

  2. It is the number of blocks present in dataset

  3. It is the number of records present in dataset

  4. none
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A Correct answer
Explanation

BLKSIZE specifies the block size in bytes, the number of bytes MVS reads in a single I/O operation. Reading larger blocks reduces I/O overhead. It is not the count of records or blocks in the dataset, but rather the physical block size on disk.

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