Advances in Databases: 15th British National Conference on by Larry Kerschberg (auth.), Carol Small, Paul Douglas, Roger

By Larry Kerschberg (auth.), Carol Small, Paul Douglas, Roger Johnson, Peter King, Nigel Martin (eds.)

This booklet includes the refereed lawsuits of the fifteenth British nationwide convention on Databases, BNCOD 15, held in London, in July 1997.
The 12 revised complete papers offered have been chosen from greater than 30 submissions. additionally integrated are 10 poster shows and the invited lecture at the position of clever software program brokers in complex details structures through Larry Kerschberg. The papers are geared up in topical sections on transaction processing, optimization, object-orientation and the net, and database integration.

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Tambe, W. L. Johnson, R. M. Jones, F. Koss, J. E. Laird, P. S. Rosenbloom, and K. Schwamb, "Intelligent Agents for Interactive Simulation Experiments," In AI Magazine, vol. 16, 1995, pp. 15-39. 64. M. Tambe and P. S. Rosenbloom, "Event Tracking in a Dynamic Multi-Agent Environment," USC - - Information Sciences Institute, Technical Report ISIRR-393, September 11, t994. 65. C. Toomey and others, "Software Agents for Dissemination of Remote Terrestrial Sensing Data," i-SAIRAS 94, Pasadena, CA, 1994.

After the announcement of the primary responsibility, node 0 sends fragment shield locks to the nodes 10 and 11. This means that node 10 and 11 may have produced log records for fragment replicas 1000 and 1004 which did not arrive in node 0 before the takeback. 34 9 Synchronization of Hot Standby Replicas a t Failures It is the node holding the primary replica of a fragment that has the responsibility for synchronizing all replicas by producing tog records and shipping them for redo execution at the hot standbys.

The query process performs three main operations: It scans the base relation(s) of the query, processes the log and extracts relevant log records, and performs the necessary undo/redo-operations before emitting the tuples. The scan is performed by the scan thread which scans the relations tuple-bytuple without setting any read locks. Thus, it will not have to wait for transactions to commit before reading a tuple, and transactions will not have to wait for the query to finish before updating a tuple.

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