Title: Online monitoring and visualisation of database structural deterioration

Authors: Takashi Hoshino, Kazuo Goda, Masaru Kitsuregawa

Addresses: Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505, Japan. ' Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505, Japan. ' Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505, Japan

Abstract: Structural deterioration of database is caused by updates of the database and can degrade performance seriously. Database reorganisation, which removes structural deterioration by relocating data in the secondary storage, is an administrator|s headache; it is difficult to schedule reorganisation efficiently to keep acceptable performance because conventional database systems lack crucial monitoring facility of structural deterioration, with high resolution, high accuracy and low overhead. In order to make database reorganisation be easy for administrators and be autonomic in the future, the paper proposes an online database structure deterioration monitor, which can visualise structural deterioration distribution, with a novel structural deterioration model, a storage performance model and an incremental update technique. The experimental results with our prototype show that our scheme can monitor structural deterioration with an error of within 12% and with an overhead of 3% at most.

Keywords: visualisation; structural deterioration; database reorganisation; IO cost estimation; storage performance models; database systems; online monitoring; incremental updates.

DOI: 10.1504/IJAC.2010.033011

International Journal of Autonomic Computing, 2010 Vol.1 No.3, pp.297 - 323

Published online: 06 May 2010 *

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