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Chapter 9

Chapter 9. Physical Data Organization and Indexing. Disks. Capable of storing large quantities of data cheaply Non-volatile Extremely slow compared with cpu speed Performance of DBMS largely a function of the number of disk I/O operations that must be performed. Physical Disk Structure.

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Relational Calculus

A nonprocedural query language, where each query is of the form { t | P ( t ) } When we substitute values for the arguments, function yields an expression, called a proposition , which can be either true or false. It is the set of all tuples t such that predicate P is true for t

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T semester - PowerPoint PPT Presentation

Chapter 9

Relational Calculus