Practically only a very small percentage of addresses is kept as initial reference points ( which also requires storage ), and most of the database data is accessed by indirection using displacement calculations ( distance in bits from the reference points ) and data structures which define access paths ( using pointers ) to all needed data in effective manner, optimized for the needed data access operations.

Practically only a very small percentage of addresses is kept as initial reference points ( which also requires storage ), and most of the database data is accessed by indirection using displacement calculations ( distance in bits from the reference points ) and data structures which define access paths ( using pointers ) to all needed data in effective manner, optimized for the needed data access operations.

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