System Analysis and Design
Back-up procedure helps in

restoring the data files whenever there is a system crash
restoring the operation whenever there is a disk failure
all of the listed here
none of the listed here

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System Analysis and Design
Sequential organization

has records placed randomly throughout the file
Stores records sequentially but uses an index to locate records
means storing records in contiguous blocks according to a key.
None of these
uses an index for each key type

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