An archiving model for a hierarchical information storage environment

Cataloged from PDF version of article.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. Ó 2000 Elsevier Science B.V. All rights reserved

National Westminster Bank mass storage archiving

The problem of retrieving records at random from a very large archival data base has not previously been eflectively soluble by data processing techniques. This paper describes such an appli-cation, in which a large bank in the United Kingdom uses the IBM 3850 Mass Storage System for storing and retrieving cus-tomer account statements