In the variable-length record format, a null bitmap is used whenever it is necessary to demonstrate that an attribute does not contain any data. Under certain peculiar circumstances, the vast majority of a tuple's attributes are represented by the value null. It is possible to cut the cost of a null attribute down to just one bit by modifying the method in which entries are stored in a database.

In the variable-length record format, a null bitmap is used whenever it is necessary to demonstrate that an attribute does not contain any data. Under certain peculiar circumstances, the vast majority of a tuple's attributes are represented by the value null. It is possible to cut the cost of a null attribute down to just one bit by modifying the method in which entries are stored in a database.

Systems Architecture

7th Edition

ISBN:9781305080195

Author:Stephen D. Burd

Publisher:Stephen D. Burd

Chapter3: Data Representation

Section: Chapter Questions

Problem 3RP

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