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Secondary Index

  • Reference work entry
  • First Online:
Encyclopedia of Database Systems

  • 21 Accesses

Synonyms

Non-clustering index

Definition

A tree-based index is called a secondary index if the order which it maintains on the search-key values is not the same as the order of the file which it indexes. For example, consider a relation R with some numeric attribute A taking values over an (ordered) domain D. Assume that relation R is not physically stored on the values of attribute A (i.e., relation R is either stored as a heap – an unordered file, or is ordered on another attribute). Furthermore, assume that a tree-based index (e.g., B+ -tree) has been created on attribute A. Then this index is secondary.

Key Points

Tree-based indices are built on numeric attributes and maintain an order among the indexed search-key values. They are further categorized by whether their search-key ordering is the same with the file’s physical order (if any). Note that a file may or may not be ordered. Ordered is a file whose records are stored in pages according to the order of the values of an...

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Recommended Reading

  1. Elmasri RA, Shamkant NB. Fundamentals of database systems. 5th ed. Reading: Addisson-Wesley; 2007.

    MATH  Google Scholar 

  2. Manolopoulos TY, Tsotras Y, Vassilis J. Advanced database indexing. Dordecht: Kluwer; 1999.

    MATH  Google Scholar 

  3. Ramakrishnan R, Gehrke J. Database management systems. 3rd ed. New York: McGraw-Hill; 2003.

    MATH  Google Scholar 

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Author information

Authors and Affiliations

  1. Aristotle University of Thessaloniki, Thessaloniki, Greece

    Yannis Manolopoulos

  2. University of Piraeus, Piraeus, Greece

    Yannis Theodoridis

  3. University of California-Riverside, Riverside, CA, USA

    Vassilis J. Tsotras

Authors
  1. Yannis Manolopoulos
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  2. Yannis Theodoridis
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  3. Vassilis J. Tsotras
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Corresponding author

Correspondence to Yannis Manolopoulos .

Editor information

Editors and Affiliations

  1. Georgia Institute of Technology College of Computing, Atlanta, GA, USA

    Ling Liu

  2. University of Waterloo School of Computer Science, Waterloo, ON, Canada

    M. Tamer Özsu

Section Editor information

  1. University of California-Riverside, Riverside, MA, USA

    Vassilis J. Tsotras

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Manolopoulos, Y., Theodoridis, Y., Tsotras, V.J. (2018). Secondary Index. In: Liu, L., Özsu, M.T. (eds) Encyclopedia of Database Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8265-9_758

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