Distributed Database Systems (International Computer Science by David Bell, Jane Grimson

By David Bell, Jane Grimson

This ebook adopts a pragmatic strategy, reviewing the basics of database expertise and advancements in info communications (including criteria) earlier than reviewing the rules of disbursed DB platforms. It contains case reviews of the best items.

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29 30 Distributed Database Systems DB design should always be preceded by the requirements phase of the software life cycle, which will among other things identify the data items (attributes) which should be stored in the DB, their meaning and their relationships to one another. In the case of the patient DB we know that the following information is to be stored about each patient: the patient number, name, date of birth, address, sex and GP. However, in order to carry out the DB design process, we need to know whether a patient can have more than one address or more than one GP and whether the patient number uniquely identifies a patient or whether it is just the date on which the patient's details were recorded on the DB.

15. Conceptually, layer n on host A communicates directly with its counterpart layer n on host B. 14 Alternative broadcast network topologies. via open relay systems (OSI terminology for PSEs) to the corresponding physical layer on host B and then up through the 'stack' on host B to layer n. The functions of the various layers can be summarized as follows: (1) The physical layer is concerned with the actual physical transmission of bits across the communications media. , Datalink 4----. Anolication •-..

4(b). 4(c). Overview of Databases and Computer Networks The Cartesian product (PRODUCT) of two relations A and B concatenates every tuple in A with every tuple in B. 5. The second group of operators are the relational operators. There are two unary relational operators, that is those which operate on a single relation, namely select and project, and one binary operator which operates on a pair of relations, join. The SELECT operator takes a horizontal subset from a relation, that is it selects those tuples from the relation which satisfy a certain constraint.

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