What is the difference between a serial collection of data and a sequential collection of data?

QUESTION:

What is the difference between a serial collection of data and a sequential collection of data? Which can be used for direct access?


ANSWER:

A serial (unordered) collection of data cannot be used meaningfully for sequential access. Although the text does not state this, certain kinds of sequential files can also be accessed directly. These are called indexed sequential files, which with the use of an external index, allow a file organized sequentially to be accessed directly.

 

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