Accession Number : ADA309874
Title : Active Heterogeneous Databases for Monitor and Control.
Descriptive Note : Final rept.,
Corporate Author : ILLINOIS UNIV AT CHICAGO CIRCLE DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SC IENCE
Personal Author(s) : Wolfson, Ouri ; Sistla, A. P. ; Yu, Clement
PDF Url : ADA309874
Report Date : MAY 1996
Pagination or Media Count : 13
Abstract : As part of this project, a rule based declarative trigger language employing temporal logic has been developed. This language facilitates monitoring of the evolution of a database over time. and permits the specification of appropriate actions that need to be taken whenever the pre specified conditions are satisfied. Each rule has a condition and an action part. Two versions of the rule language have been developed. In the first version, the condition part of the language is specified in Past Temporal Logic, and in the second version the condition part is specified in Future Temporal Logic. The project has implemented systems that monitor conditions specified in the two temporal logics. In the area of heterogeneous database systems, systems for schema and query translations between object-oriented databases and relational databases have been developed and implemented- These two types of databases are chosen., because relational databases are widely used and object-oriented databases are gaining popularity. With both the schema and query translators, a relational user can access an object-oriented database and an object-oriented user can access a relational database. Parts of the systems have been ported to the Rush Medical Center, and to Hughes Aircraft Co.
Descriptors : *DATA BASES, *RULE BASED SYSTEMS, *HETEROGENEITY, MONITORING, COMMUNICATIONS NETWORKS, EVOLUTION(GENERAL), COMPUTER APPLICATIONS, PARTS, MEDICAL SERVICES, OBJECT ORIENTED PROGRAMMING.
Subject Categories : Computer Systems
Distribution Statement : APPROVED FOR PUBLIC RELEASE