Answer / guest

Control Interval is analogous to a physical block for QSAM
files. It is the unit of I/O. Must be between 512 bytes to
32 k. Usually either 2K or 4K. A larger control interval
increases performance for sequential processing while the
reverse is true for random access. Under CICS when a record
is locked, the entire CI gets locked.

Control Area is a group of control intervals. CA is used
during allocation. CA size is calculated based on the

allocation type (cyl, tracks or records) and can be max of 1
cylinder

What is the index set?

1 Answers  

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is it slower if you access a record through alternative index as compared to primary index?

1 Answers   IBM,

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Explain the biggest disadvantage of using a vsam dataset?

0 Answers  

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how do you create an alternate index ?

0 Answers   IBM,

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can any one tell "in esds in what structure records will stored?"

1 Answers  

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What is the use of access method services in vsam?

0 Answers  

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How do you fix the problem associated with VSAM out of space condition?

1 Answers   IBM,

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What is the difference between sequential files and ESDS files?

1 Answers   IBM,

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What is the biggest disadvantage of using a vsam dataset?

0 Answers  

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explain how can you initialize a vsam file before any operation?

0 Answers   IBM,

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What is the upgrade set?

1 Answers  

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Create syntax for a VSAM file ?

2 Answers   Xansa,

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