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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
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we can define the ksds cluster by two ways by using the file-aid or by using the idcams utility. Explain them.
How is the sorting of vsam files carried?
What are the access method services used in vsam?
What is a ci split? What is a ca split?
Explain the function of entry-sequenced data set?
What is the biggest disadvantage of using a vsam dataset?
why ci and ca splits are not possible in esds and rrds?
What does the keyranges parameter in define cluster command do?
Discuss record management in vsam?
Define base cluster?
What is the main purpose of having user catalog in vsam?
What are the building blocks used in vsam datasets?
How does control intervals and control areas related to each other?
Explain the process in which flat files are converted into vsam files?
what is meant by dirty read in vsam?
