Access Restriction

Author Holtman, K. ♦ van der Stok, P. ♦ Willers, I.
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©1998
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Computer programming, programs & data ♦ Technology ♦ Engineering & allied operations
Subject Keyword Electrical capacitance tomography ♦ Physics ♦ Prototypes ♦ Throughput ♦ Energy measurement ♦ Transaction databases ♦ Frequency ♦ Read only memory ♦ Pattern analysis ♦ Cost accounting
Abstract In the very large object database systems planned for some future particle physics experiments, typical physics analysis jobs will traverse millions of read-only objects, many more objects than fit in the database cache. Thus, a good clustering of objects on disk is highly critical to database performance. We present the implementation and performance measurements of a prototype reclustering mechanism which was developed to optimise I/O performance under the changing access patterns in a high energy physics database. Reclustering is done automatically and on-line. The methods used by our prototype differ greatly from those commonly found in proposed general-purpose reclustering systems. By exploiting some special characteristics of the access patterns of physics analysis jobs, the prototype manages to keep database I/O throughput close to the optimum throughput of raw sequential disk access.
Description Author affiliation: EP Div., CERN, Geneva, Switzerland (Holtman, K.)
ISBN 0818683074
ISSN 10988068
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research ♦ Reading
Education Level UG and PG
Learning Resource Type Article
Publisher Date 1998-07-10
Publisher Place UK
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Size (in Bytes) 113.14 kB
Page Count 9
Starting Page 132
Ending Page 140

Source: IEEE Xplore Digital Library