DDBMS.pdf

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Evolution of Distributed Database Management System During the 1970s, corporations implemented centralized database management systems to meet their structured information needs. Structured information is usually presented as regularly issued formal reports in a standard format. Copyright @ www.bcanotes.com
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The use of centralized database required that corporate data be stored in a single central site, usually a mainframe computer. Data access was provided through serially connected dumb terminals . The centralized approach worked well to fill the structured information needs of corporations, but it fell short when quickly moving events required faster reponse times and equally quick access to information. Copyright @ www.bcanotes.com
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The 1980s gave birth to a series of crucial social and technological changes that affected database development and design, such as: Business operations became more decentralized geographically. Competition increased at the global level. Customer demands and market needs favored a decentralized management style. Copyright @ www.bcanotes.com
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Rapid technological change low cost mainframe. The large number of applications based on DBMS and the need to protect investments in centralized DBMS software made the notion of data sharing attractive. Copyright @ www.bcanotes.com
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During 1990s the factors we have just described became even more firmly pressured. However, how these factors were addressed was strongly influenced by: The growing acceptance of internet and, particularly, the WWW , as the platform for data access and distribution. The WWW is, in effect, the repository for distributed data. The increased focus on data analysis that led to data mining and warehousing. Although a data warehouse is not usually a distributed database, it does rely on techniques-such as data replication and distributed queries-that facilitate its data extraction and integration. Copyright @ www.bcanotes.com
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The decentralized database is especially desirable because centralized database management is subject to problems such as: Performance degradation due to a growing number of remote locations over greater distance. High Cost associated with maintaining and operating large central (mainframe) database systems. Reliability problems created by dependence on central site. Copyright @ www.bcanotes.com
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Advantages of DDBMS Data are located near the “greatest demand” site: The data in a distributed database system are dispersed to match business requirements. Copyright @ www.bcanotes.com
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Faster Data Processing: A distributed database system makes it possible to process data at several sites, thereby spreading out the system’s workload.
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