Técnica de controle de concorrência semântico para sistemas de gerenciamento de bancos de dados em tempo-real.

Abstract

The great technological advance in the areas Sensor Networks has motivated the use of such networks a variety of applications, among them can detach: monitoring systems, flood detection system, supervising items in a factory warehouse, among others. The principal characteristic of those applications it is the large volume of data with time of useful life limited that they need to be processed, consequently the transactions that also use them they should have temporal constraints so that they get to use such data while the same ones are still valid. Such characteristics impose the necessity of such applications to be managed through a Real-Time Database System, that besides being projected to deal with great volumes of data, also they guarantee the logical and temporal validity given and transactions to the m. In that work, it introduces one mechanism of concurrency control for real-time database system, called is Semantic Concurrency Control Protocol, the concurrency control should have the ability to express the trade-off that results from the inherent conflict between temporal and logical consistency constraints, and also be able to maintain and bound any imprecision that results from trading off logical consistency for temporal consistency. This protocol is based on a Compatibility Function (CF), defined for the user, for the methods of reading and writing of an object of the application. The FC also controls and limits bounded imprecision when it happens trading off logical consistency for temporal consistency. The Semantic Concurrency Control Protocol was implemented mm the programming language Java and the database was stored im the Database Management System of Microsoft DB2 IBM.