Whilst for the software side, this is done by keeping
operating system, device drivers, and application software up-to-date with the most recent
service packs (DB2 Operation, 2000).
Regarding the highly available database platforms, the technological advantages of clustering
technologies, database replication, and database log mirroring are the main implementation
issues towards protection against database server failure. Clustering essentially uses multiple
servers in an environment where one or more backup servers can seamlessly take over the
workloads of a failed primary server. This section will examine each of these alternatives
and discuss how they are implemented by each of the enterprise database products.
Database H gh Ava lab l ty: An Extended Survey
Copyright ?© 2007, Idea Group Inc. Copying or distributing in print or electronic forms without written permission
of Idea Group Inc. is prohibited.
Database.Clustering
With database clustering, each physical server in the cluster is called a node. The entire
group of nodes work together to form a cluster. These clustering nodes can be viewed as a
single node/server. The showcasing of a single server instead of multiple clustered nodes is
accomplished by sharing common resources.
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