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Details of Grant 

EPSRC Reference: GR/K55509/01
Title: VALIDATION OF THE MASTA I/O COST MODEL FOR DATABASE CRASH RECOVERY MECHANISMS
Principal Investigator: Munro, Dr D
Other Investigators:
Morrison, Professor R Connor, Dr R
Researcher Co-Investigators:
Project Partners:
Department: Computational Science
Organisation: University of St Andrews
Scheme: Standard Research (Pre-FEC)
Starts: 01 July 1995 Ends: 31 July 1995 Value (£): 2,220
EPSRC Research Topic Classifications:
Information & Knowledge Mgmt
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Summary on Grant Application Form
The design of database crash recovery mechanisms on modern computer systems must take account of the relative speed of processors over disks. In these systems disk I/O activity is the dominant expense and the disk transfer time relative to seek time makes patterns of disk access significant. The MaStA (Massachusetts St Andrews) cost model for database crash recovery mechanisms, designed by the authors, provides finer grained distinctions of I/O costs than previous work by being structured independently of machine architectures and application workloads and refining costs in terms of I/O categories, access patterns and application workload parameters. The main features of the model are:+ Cost is based upon a probabilistic estimation of disk activity, broken down into sequential, asynchronous, clustered synchronous, and unclustered synchronous disk accesses for each recovery scheme.+ The model is calibrated by different disk performance characteristics, either measured by experiment or predicted by analysis.+ The model may be used over a wide variety of workloads, including those typical of object-oriented and database programming systems.
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Organisation Website: http://www.st-and.ac.uk