Autonomic Databases: Detection of Workload Shifts with n-Gram-Models

  • Authors:
  • Marc Holze;Norbert Ritter

  • Affiliations:
  • Department of Informatics, University of Hamburg, Hamburg, Germany 22527;Department of Informatics, University of Hamburg, Hamburg, Germany 22527

  • Venue:
  • ADBIS '08 Proceedings of the 12th East European conference on Advances in Databases and Information Systems
  • Year:
  • 2008

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Abstract

Autonomic databases are intended to reduce the total cost of ownership for a database system by providing self-management functionality. The self-management decisions heavily depend on the database workload, as the workload influences both the physical design and the DBMS configuration. In particular, a database reconfiguration is required whenever there is a significant change, i.e. shift, in the workload.In this paper we present an approach for continuous, light-weight workload monitoring in autonomic databases. Our concept is based on a workload model, which describes the typical workload of a particular DBS using n-Gram-Models. We show how this model can be used to detect significant workload changes. Additionally, a processing model for the instrumentation of the workload is proposed. We evaluate our approach using several workload shift scenarios.