Real-time Data Definition And Operation In Arts-edb System

Real-time database system is a database system for the development of a branch, it applies to dealing with rapidly changing constantly updated data and time-bound transactions. Real-time database technology is a real-time systems and database technology, the product of a combination, the researchers hope to use database technology to solve real-time systems in the data management issues, while taking advantage of real-time database technology for real-time time-driven scheduling and resource allocation algorithm. As a real-time database system, the main research contents of the definition of real-time data processing of study is a very important.In concluding this paper the field of real-time database of the basic concepts and theories,based on the history of the development,the main characteristics of real-time data research,analysis of how real-time database systems for real-time data definition and treatment. In the real-time database system,the data with the external environment changes the state of rapid change,its value only in a certain period of time is valid, out of date would be invalid, and therefore the system in addition to protecting the internal state of the database (data values) the accuracy,phase capacitive,but also must safeguard the internal state and external environment,the actual state of consistency,as well as data for decision-making or derive new data at the time when the mutual consistency. The operation of real-time data must also be time to consider the consistency,including time constraints and the temporal relational algebra operations and other issues.Characteristics of real-time data through a detailed study of this paper in the traditional database data model based on the concept by extending the time were added to the data model, and establish the definition of real-time data and operation standards, enabling real-time database to meet the definition of real-time data processing requirements...