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Examples of Online Databases:
The adoption of modern technology has resulted in the proliferation of machine readable databases. The National Library of Medicine (USA) designed its MEDLARS which became operational in 1964. Later appeared its online version as MEDLINE. Engineering Index of the Engineers° Joint Council (USA) and Biological Abstracts soon had their corresponding online versions, viz., COMPENDEX and BIOSIS. Yet another very large online database is that of Information Services for Physics and Engineering Communities, called INSPEC (UK) representing the three printed versions of Physics Abstracts, Electrical and Electronic Abstracts and Computers and Control Abstracts.
CA Search and AGRICOLA, the online counterparts respectively of Chemical Abstracts and Bibliography of Agriculture (NAL, USA) are worth mentioning. These are all also devoted to sciences. Of the social sciences, there exist a number of large online databases particularly in economics, psychology, political science and management. For example, PsychINFO is the online version of Psychological Abstracts.
MARC database of the Library of Congress is a good source to search for resources in humanities. It is also worthwhile to know about two full text online databases: one is LEXIS in law and the other is NEXIS that offers several newspapers and business publications.
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Storage capacity and Cost per bit of storage: Storage capacit y: It is the amount of data that can be stored in the storage unit. A large capacity is preferred. Cost pe
Types of Search Engine: Some of the basic categories of Search engines are : a. Primary Search Engines: Such search engines use web crawlers or spiders to traverse the w
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Transaction-based model: Here, the pricing is based on providing a committed business service, for ex, processing payroll for a global company as part of HR offering and this
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Data transmission: Most digital communication data is transmitted in a serial form, that is, only one bit at a time. Transmission of data in serial form means each bit is tran
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