Title :
Object histories as a foundation for an active OODB
Author :
Van den Akker, Johan ; Siebes, Arno
Author_Institution :
CWI, Amsterdam, Netherlands
Abstract :
Several links exist between active and temporal databases. These are summarised by the observation that rules are triggered by a specified evolution of the database. We discuss the relation between active and temporal database using DEGAS, an object based active database programming language. To achieve full active database functionality, a DEGAS object records its complete history. Hence, all data needed for a temporal database supporting a single temporal dimension is provided. Furthermore, the semantics of the active behaviour of DEGAS are defined straightforwardly in terms of the object history. Finally we discuss the advantages and disadvantages of extending DEGAS with a second time dimension (to achieve full temporal functionality) from an active database perspective
Keywords :
active databases; deductive databases; object-oriented databases; object-oriented languages; query languages; temporal databases; DEGAS; active OODB; active behaviour; active database perspective; full active database functionality; full temporal functionality; object based active database programming language; object histories; object history; temporal databases; temporal dimension; Computer languages; Data models; Event detection; History; Object oriented databases; Production; Spatial databases;
Conference_Titel :
Database and Expert Systems Applications, 1996. Proceedings., Seventh International Workshop on
Conference_Location :
Zurich
Print_ISBN :
0-8186-7662-0
DOI :
10.1109/DEXA.1996.558263
