Linguagem de consulta para aplicações em tempo-real.

Abstract

Processing of continuous data streams is emerging as new and expanding area of research and concerns the processing of information from sources that produce data in a fast rate and in a continuous way. For example, information from sensory devices can be considered as a continuously expanding and unlimited sequence of data items without any boundaries. Traditionally, such information required special monitoring applications and equipment that process and react to continual inputs from several sources such as in a weather monitoring station, patient monitoring equipment, etc. This work, presents a syntax for the declaration of real-time queries, called Query Language for Application Real-Time Databases (QL-ARTDB) or Query Language for Real-Time Databases (QL- RTDB). Ahead of the developed syntax we implement a interface to process the QL- RTDB. Such interface can be used in applications that they need to deal with temporal restrictions. It was implemented through the DBMS IBM DB2 and programming language Java. The DBMS that we use is IBM DB2, however, the same can be substituted by any another one with the same characteristics. The syntax of the language allows that the users de ne its queries using the SQL-99 added of the primitives in real-time that they correspond to the imposed temporal restrictions to the data used for the same ones. The advantage of this interface is to accept a commerce DBMS to process conventional data as conventional data with time restrictions which is necessary to business that need to work with both ways.