Database Management System, Network Database Providers, Hierarchical Database Model, Distributed Database Management System

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Database management system can be defined as computer software made for organizing, analyzing and modifying the information stored in a database. It is a set of programs that helps in controlling the organization's storage and retrieval of data in a database. Some of the examples of DBMS are Oracle, Microsoft Access, Microsoft SQL server and File maker. The greatest advantage of using database management systems is that information systems can be changed easily according to the company's requirements.

The market for database management system software experienced rapid growth of 9.5% in 2006. The total revenue for DBMS software exceeded 5 billion euros in 2006.

DISTRIBUTED DATABASE

A database that consists of two or more data files stored on multiple sites on a computer network. A distributed database is divided in to many partitions or fragments that can easily be copied. Many users can access the database at the same time without interfering each other. The most important benefit of distributed database management system is that they are economical and can be modified, added or removed from the system easily.

NETWORK DATABASE

(35 Companies)

The network database is a database that is constructed like a set. The set contains an owner record type, the name of the set and a record type of the member. In this model the whole network of relationships is symbolized by many paired sets. The network database model represents different objects and their relationships in a flexible manner. It is basically used by network installation tool for finding and allocating the network resources.

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OBJECT ORIENTED DATABASE

The object oriented database management system (OODBMS) presents information in the form of objects that are used in Object-Oriented Programming. In other words we can say that object database management systems are a combination of database capabilities and object programming language capabilities. The main feature of ODBMS is that it makes database objects look like programming language objects. Some of these object oriented database languages are Python, Java, C, Visual Basic, .NET, C++ and Smalltalk.

RELATIONAL DATABASE

Relational Database aids in storing, managing and disseminating information of various types. The RDBMS contains objects, tables, queries, forms, reports, macros stored in the form of computer programs. In the RDBMS the data and the relationship between them are properly organized in tables (accumulation of records with every entry having the same field). In the table the fields and records are represented as columns and rows respectively. This model can increase the versatility and speed of the database using the relationship of similar data. Some of the examples of this model are Sybase, Informix, OLEDB, SQL server, and Oracle.

HIERARCHICAL DATABASE

In the hierarchical database model the data is organized in tree form. It is known as hierarchical because it contains a hierarchy of parent and child data sections. Data is presented in a series of records having fixed field values attached to them. It compiles all the records together as record types. In the hierarchical model the links are developed between the record types through parent child relationships using trees. In this model the ratio of parent-child relationship is 1:many. The examples of hierarchical model are Adabas, GTM, IMS, MUMPS, Metakit FOCUS, DMSII and Multidimensional hierarchical toolkit.

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