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      An archiving model for a hierarchical information storage environment

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      Author
      Moinzadeh, K.
      Berk, E.
      Date
      2000
      Source Title
      European Journal of Operational Research
      Print ISSN
      0377-2217
      Publisher
      Elsevier
      Volume
      123
      Issue
      1
      Pages
      206 - 225
      Language
      English
      Type
      Article
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      Abstract
      We consider an archiving model for a database consisting of secondary and tertiary storage devices in which the query rate for a record declines as it ages. We propose a `dynamic' archiving policy based on the number of records and the age of the records in the secondary device. We analyze the cases when the number of new records inserted in the system over time are either constant or follow a Poisson process. For both scenarios, we characterize the properties of the policy parameters and provide optimization results when the objective is to minimize the average record retrieval times. Furthermore, we propose a simple heuristic method for obtaining near-optimal policies in large databases when the record query rate declines exponentially with time. The e ectiveness of the heuristic is tested via a numerical experiment. Finally, we examine the behavior of performance measures such as the average record retrieval time and the hit rate as system parameters are varied.
      Keywords
      Heuristic methods
      Hierarchical systems
      Information management
      Information retrieval systems
      Mathematical models
      Optimization
      Query languages
      Archiving model
      Hierarchical information storage
      Poisson process
      Record query rate
      Permalink
      http://hdl.handle.net/11693/11077
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/S0377-2217(99)00079-X
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