Encyclopedia of Database Systems

2018 Edition
| Editors: Ling Liu, M. Tamer Özsu

Hierarchical Data Summarization

  • Egemen Tanin
  • Mohammed Eunus Ali
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-8265-9_536

Synonyms

Hierarchical data summarization

Definition

Given a set of records, data summaries on different attributes are frequently produced in data management systems. Commonly used examples are the number of records that fall into a set of ranges of an attribute or the minimum values in these ranges. To improve the efficiency in accessing summaries at different resolutions or due to a direct need for investigating a hierarchy that is inherent to the data type, such as dates, hierarchical versions of data summaries can be used. A data structure or algorithm is labeled as hierarchical if that structure or algorithm uses the concept of subcomponents to systematically obtain conceptually larger components. The method of obtaining a larger component is regularly induced by the user’s understanding of the domain as well as the fact that hierarchies can also be created automatically by a set of rules embedded into the system. Thus, rules used in a data structure’s creation, e.g., B+-trees,...

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Computing and Information SystemsUniversity of MelbourneMelbourneAustralia
  2. 2.Department of Computer Science and EngineeringBangladesh University of Engineering and Technology (BUET)DhakaBangladesh