New PDF release: Advanced Database Systems: 10th British National Conference

By Michael L. Brodie (auth.), Peter M. D. Gray, Rob J. Lucas (eds.)

ISBN-10: 3540556931

ISBN-13: 9783540556930

The topic of this publication is the possibility of new complicated database platforms. the amount provides the lawsuits of the tenth British nationwide convention on Databases, held in Aberdeen, Scotland, in July 1992. the amount includes invited papers, one at the promise of disbursed computing andthe demanding situations of legacy structures through M.L. Brodie, and the opposite on object-oriented standards trap and research and the Orca undertaking by way of D.J.L. Gradwell. the next 4 components every one include 3 submitted papers chosen from a complete of 36 submissions. The components are entitled: - Object-oriented databases - Parallel implementationsand business structures - Non-relational information versions - good judgment programming and databases

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Additional info for Advanced Database Systems: 10th British National Conference on Databases, BNCOD 10 Aberdeen, Scotland, July 6–8, 1992 Proceedings

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Seshadri and A. Silberschatz with database technology5 , however, this requires some support from network element manufacturers. Therefore, our architecture does not assume all network elements have been enhanced with database technology, but yet tries to minimize the impact of these network elements. In Figure 3, NE1 and NE6 are network elements that have been enhanced with database technology and are denoted by the rectangle around these network elements. This enhancement enables them, for example, to perform some computation at the network element and return only the information that the network manager is interested in thus minimizing the volume of network management traffic.

The coordinator solicits votes from each of the NN participating in the transconfiguration using the PrepareRequest message. The coordinator collects these votes and then decides on an outcome. If any NN voted No or if a timeout expires before all votes are collected the coordinator decides Abort and sends a AbortRequest message to any site where a tentative update was performed. If all sites vote Yes a CommitRequest messages is sent to all non read-only sites. Figure 3 shows the state diagrams of a Coordinator, a NN performing reconfiguration and a NN involved only in read requests.

In the example of Figure 2 the NOC first reads a value from an NN in London then provisionally updates a value on a NN in London based on the value read at Frankfurt. The NOC prepares, and then later commits the changes at the London NN. After this a prepareRequest is sent to Frankfurt and the read locks are released there. 3 A Centralised Two-Phase Commit Solution Perhaps the most popular and prevalent commit protocol is the Centralised TwoPhase Commit Protocol[1]. We will describe it in the environment of Network Management.

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Advanced Database Systems: 10th British National Conference on Databases, BNCOD 10 Aberdeen, Scotland, July 6–8, 1992 Proceedings by Michael L. Brodie (auth.), Peter M. D. Gray, Rob J. Lucas (eds.)


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