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

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

This e-book comprises the refereed complaints 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 displays and the invited lecture at the function of clever software program brokers in complicated details structures by means of Larry Kerschberg. The papers are equipped in topical sections on transaction processing, optimization, object-orientation and the net, and database integration.

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Extra info for Advances in Databases: 15th British National Conference on Databases, BNCOD 15 London, United Kingdom, July 7–9, 1997 Proceedings

Sample text

The shaded boxes show the two periods, takeover and takeback, when fragment 1000 is unavailable. The recovering node goes through several phases before it regains its role as a primary. First, a node-internal recovery makes node 0 actionconsistent. Second, node 0 is caught up by using the replicated tuple log sent from node 10. Third, it is made hot standby for all its fragment replicas. Fourth, it regains the primary role as prior to the crash, the takeback. ~keover so~:,o __~_ . . . _~_. .

The nodes holding the hot standby fragment replicas for the failed node take over as primaries. Q-rot declustering minimizes the takeover time, because the takeover is performed in parallel at multiple nodes. This is important since during the takeover parts of the database are temporarily unavailable. Unlike mirrored declustering, Q-rot declustering ensures the increased load for the nodes involved in the takeover to be spread over multiple nodes. , if node 0 in Figure 1 failed, node 10 and 11 at site B will take over the primary responsibility for fragment replica 1000 and 1004, respectively.

For high availability, the declustering strategy must ensure the replicas of a fragment to reside at different sites. To facilitate load balancing, fragment replicas must be evenly distributed over the nodes. Furthermore, all nodes must storeboth primary and hot standby fragment replicas. Primary fragment replicas will give higher load since read operations only affect them. A straight forward declustering strategy is multi-site mirrored declustering [3, 17]. Pairs of nodes (one node from each site) store replicas of the same fragment.

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