By David Bell, Jane Grimson
Dispensed database structures have now come of age with the declaration of a number of advertisement items (Oracle, Ingres, Multi-Star) which meet the pressing want for integration of heterogeneous collections of information. This booklet adopts a pragmatic strategy, reviewing the basics of database know-how and advancements in facts communications (including criteria) prior to reviewing the foundations of allotted DB structures. It comprises case reviews of the prime items.
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Additional info for Distributed Database Systems
A database, where a database is defined as an integrated collection of shared data, a reservoir of data. 1 Facilities for maintenance of meta-data, for example through a data dictionary or system catalogue; Data independence - the insulation of physical data from the way in which it is viewed by users and application programmers (logical view); Tools for the database administrator; these can include tools for both the design and monitoring of the database. ) within an organization, that is it enabled sharing of the corporate data resource.
To another. The network layer also ensures that the network does not get swamped with packets leading to bottlenecks. e. from originator to recipient), and the lower layers, which are concerned with point-to-point transport of data. It decides what type of end-to-end connection is needed depending on the requirements. An error-free end-to-end connection, which delivers messages in the same order in which they were transmitted, is an example of a common transport connection. Overview of Databases and Computer Networks (5) (6) (7) The session layer manages sessions between different machines.
14. 1 Network architecture Networks are concerned with connecting (often heterogeneous) components and it is therefore essential to agree a set of rules governing the manner in which they can communicate. This set of rules is called a protocol. Furthermore, this language must be very structured so that messages do not get muddled, like two people talking at the same time on a half-duplex radio or normal telephone. 13 Alternative point-to-point network topologies. tation details from the upper layer.
Distributed Database Systems by David Bell, Jane Grimson