Question

Which allocation strategy to be used if file size is large and if it is to be accessed randomly?

Answer 1

The answer is index.

Index allocation strategy must be used if the file size is large and if it is to be accessed randomly.               

The index allows to access a record in a file randomly using a file key. This key must be unique and helps in making the record distinct and easily identifiable. Sometimes, over one index is present. In such cases, the additional indexes are called alternate indexes.