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The Computer Journal 2002 45(5):481-493; doi:10.1093/comjnl/45.5.481
© 2002 by British Computer Society
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Persistent Views—A Mechanism for Managing Ageing Data

Janne Skyt1 and Christian S. Jensen1

1 Aalborg University, Department of Computer Science, Fredrik Bajers Vej 7E, DK-9220 Aalborg Øst, Denmark Email: skyt@cs.auc.dk

Enabled by the continued advances in storage technologies, the amounts of on-line data grow at a rapidly increasing pace. This development is witnessed in many data warehouse-type applications, including so-called data webhouses that accumulate click streams from portals. The presence of very large and continuously growing amounts of data introduces new challenges, one of them being the need for effective management of aged data. In very large and growing databases, some data eventually becomes inaccurate or outdated and may be of reduced interest to the database applications. This paper offers a mechanism, termed persistent views, that aids in flexibly reducing the volume of data, for example, by enabling the replacement of such ‘low-interest’, detailed data with aggregated data. The paper motivates persistent views and precisely defines and contrasts these with the related mechanisms of views, snapshots and physical deletion. The paper also offers a provably correct foundation for implementing persistent views.

Received 30 August, 2001. Revised 6 March, 2002.


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