To show that an attribute has no value, the variable-length record format uses a null bitmap. The bulk of a tuple's properties are null in a few unusual instances. By altering the way records are represented, it is feasible to reduce the cost of a null attribute to only one bit.

To show that an attribute has no value, the variable-length record format uses a null bitmap. The bulk of a tuple's properties are null in a few unusual instances. By altering the way records are represented, it is feasible to reduce the cost of a null attribute to only one bit.

CMPTR

3rd Edition

ISBN:9781337681872

Author:PINARD

Publisher:PINARD

Chapter17: Creating A Database

Section: Chapter Questions

Problem 9QY

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