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By D. A. Bell
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Extra resources for Relational Databases. State of the Art Report
Specification of load data For this study an extension to existing requirements definition notations such as that of Leggett (BEL4) has been developed to capture database load specifications. When designing the structure and organisation of a database, a database designer must know the frequency of each application function and other data in order to calculate access probabilities. He/she should also know which tuples or relations are to be assessed simultaneously or consecutively to service the functions, so that he/she can determine how the tuples or relations should be physically clustered for efficiency.
He is now a professor at the University of Paris and research project leader at the Institut National de Recherche en Informatique et Automatique (INRIA). His main interests are databases, expert systems and distributed systems. A former member of the SIRIUS project leading team and one of the designers of SIRIUS DELTA, a distributed database system, Professor Gardarin currently leads the SABRE project whose aims are to design and develop an advanced data and knowledge base computer. Tools for database design and programming—a new perspective Introduction The idea of a computer aid for database design and programming is now widespread because of the complexity of structuring an extensive list of information and the tedious task of specifying transactions directly in inadequate programming languages such as COBOL.
The SQL/DS system also provides utility functions for archiving of the database and log files and for forward recovery. Archiving may use either the utility supplied as part of the DBMS, or the dump/restore facilities—VSAM Back-up/Restore or DDR—offered by the host operating systems. Databases, DBS PAC Es, tables, indexes and views The SQL/DS database is divided into a number of DBSPACEs, each of which may have different characteristics as regards size, public or private accessibility and allocation to data storage devices.