System Analysis and Design
Back-up procedure helps in

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

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System Analysis and Design
Inverted list organization

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

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