منابع مشابه
Some Performance Issues in Distributed Real Time Database Systems
Database performance is an important aspect of database usability. Distributed real time database systems (DRTDBS) must be designed on all levels of database architecture to support timely execution of requests. The primary performance objective in DRTDBS is to minimize the number of missed deadlines. Due to the demanding nature of this objective, traditional approaches are inadequate. However,...
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This paper treats the file redundancy issue in distributed database systems asking what is the optimal number of file copies, given the ratio r of the frequencies of query and update requests. To draw a general conclusion applicable to a wide variety of practical distributed database systems, simplified network models are constructed , and optimal number of file copies, as well as their locatio...
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Video databases became an active field of research during the last years. Many universities and research groups are building prototypes and the first commercial products are becoming available. This paper surveys some of the most important open issues that should be taken into account when designing a contemporary video database system. Index Terms Video databases, Multimedia database syste...
متن کاملResearch Issues in Real-Time Database Systems
Today's real-time systems are characterized by managing large volumes of data. Efficient database management algorithms for accessing and manipulating data are required to satisfy timing constraints of supported applications. Real-time database systems involve a new research area investigating possible ways of applying database systems technology to real-time systems. Management of real-time in...
متن کاملPerformance Issues of a Web Database
Web databases are becoming an efficient tool used to manage the web sites. In this paper we analyse the performance of a typical Web database system with different sizes of web pages and different sizes of database tables. Since a web server and a database server work simultaneously, the response time in dealing with a request to the database can not be seen simply as the web server service tim...
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ژورنال
عنوان ژورنال: Mathematical and Computer Modelling
سال: 1990
ISSN: 0895-7177
DOI: 10.1016/0895-7177(90)90170-r