||Oracle Tips by Burleson
Oracle10g Grid Computing
Chapter 12 - RAC Design Considerations
Cache fusion in Oracle10g RAC introduces an
improved diskless algorithm that handles cache coherency more
efficiently than Oracle’s earlier disk-ping-based architectures.
This enables simpler database designs to be implemented while
achieving optimal performance. However, great care must be taken to
select the fastest interface and network components to get optimal
performance from the cluster interconnect in order to realize the
true benefits of Oracle's improvements.
Designing for true high availability starts with
redundant hardware. If there are multiple single-points of failure,
then the finest RAC implementation in the known Universe will do
little to achieve high availability.
The response time and throughput requirements
placed on the system by service-level agreements and customer/client
expectations ultimately determine whether a data and functional
partitioning strategy should be implemented, and how stringent the
strategy must be. The response time and throughput needs for the
application also determine how much effort needs to be invested to
achieve an optimal database design.
To determine how to allocate work to particular
instances, start with a careful analysis of the system’s workload.
This analysis must consider:
Functional dependencies between
application software components.
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