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Introduction to Database Systems by ITL Education Solutions Limited

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CHAPTER 15

INFORMATION RETRIEVAL

After reading this chapter, the reader will understand:

  • Information retrieval process and information retrieval system
  • Differences between database system and information retrieval system
  • Vector space model for document representation
  • TF/IDF based ranking
  • Similarity based retrieval, cosine similarity, and relevance feedback
  • Performance measures, recall, and precision
  • Inverted index
  • Signature files
  • Working of web search engines

Any web page, usually designed in HTML or XML, is considered to be a document. The web documents may be multimedia objects such as images or video clips or it may also contain data in the form of text. There are billions of documents on the Web, which is the biggest source of information. ...

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