Online Retrieval Systems
Online retrieval systems appeared in the early years of computer application in information retrieval (60s & 70s)
Examples of these systems were Dialog, Ovid and RBS.
Online retrieval systems are designed to work on many large live databases containing millions of records and some times their documents
Compared to other systems, online retrieval systems provide very advanced search and retrieval features
Online retrieval systems are usually fee- or subscription-based services; and they provide access to peer viewed, quality (often scholarly) information sources
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