Is a ratio of buffer cache hits to total of requests, that is, the probability that a data block will be in memory on a subsequent block re-read
Published in Chapter:
Self-Tuning Database Management Systems
Camilo Porto Nunes (Federal University of Campina Grande, Brasil), Cláudio de Souza Baptista (Federal University of Campina Grande, Brasil), and Marcus Costa Sampaio (Federal University of Campina Grande, Brasil)
Copyright: © 2009
|Pages: 9
DOI: 10.4018/978-1-60566-242-8.ch080
Abstract
Computing systems have become more complex and there is a plethora of systems in heterogeneous and autonomous platforms, from mainframes to mobile devices, which need to interoperate and lack effective management. This complexity has demanded huge investments to enable these systems to work properly. It is necessary to invest on software acquisition and installation: management, administration, and update. These costs compound the Total Cost of Ownership (TCO), which tends to increase exponentially according to the software complexity. Information Technology (IT) focuses mainly on providing information services in order to achieve simplicity, agility, large access to information, and competitivity. Database Management Systems (DBMS) are part of the IT infrastructure in large, medium, and even small enterprises.