Object Database Management System Essay Example | Topics and Well Written Essays - 2000 words

Object Database Management System - Essay Example There are two most important factors that lead users to implement object database technology. Firstly, relational databases turn out to be cumbersome to use with composite data. Secondly, data is usually operated by application software written using object-oriented programming languages such as C++, Java, Delphi and C#, and the code required translating between this demonstration of the data and the tuples of a relational database can be dreary to write, and prolonged to execute. This variance between the models used to represent information in the application programs and the database is sometimes referred to as an impedance variance. Now a day Client-Server applications that depends on a database on the server as a data store while servicing requests from multiple clients are quite ordinary. The majority of these applications use a Relational Database Management System (RDBMS) because their data store while using an object oriented programming language for development. The "impedance mismatch" caused as a result of having to map objects to tables and vice versa has long been accepted as an essential performance penalty. Object-oriented databases are designed to work well with object-oriented programming languages such Java, C#, and C++. ODBMS used exactly the same model as object-oriented programming languages. Object database management systems added the notion of persistence to object programming languages. The early commercial products were integrated with various languages: GemStone (Smalltalk), Gbase (Lisp), and Vbase. (COP). COP was the C Object Processor, a proprietary language based on C that pre-dated C++. For much of the 1990s, C++ dominated the commercial object database management market. Vendors added Java in the late 1990s and more recently, C#. (Object database - Wikipedia, the free encyclopaedia) Theory We now introduce some basic concept of general system theory. This is essentially a way of understanding a system in terms of those components and characteristics that are common to all systems. We use the term system here in a very specific sense; although one that has much broader application than just computer systems. In everyday speech people may refer to the legal system, a tropical storm system, the system of parliamentary democracy, an eco-system, a system for winning at roulette, a computer system in someone's office, a system for shelving books in a library, a system-build house and many more. Some of these certainly meet our definition of a system and others do not. Probably the only thing that they all have in common is that they have some kind of organization. But in general systems theory, a system is rather more than just anything that shows a degree of organization. Characteristics of a system A system exists in an environment. A system is separated from its environment by some kind of boundary. Systems have inputs and outputs. They receive inputs from their environment and send outputs into their environment. Systems have interfaces. An interface allows communication between two systems. A system may have sub-system. A sub-system is also a system, and may have further sub- systems of its own. Systems that endure have a control mechanism. System control relies on feedback (and sometimes feed-forward). These comprise information about the system's operations or its