Oracle Essentials [Electronic resources] : Oracle Database 10g, 3rd Edition نسخه متنی

6.8 Real Application Clusters and Performance

Oracle9i
introduced an evolution of the Oracle Parallel Server
(OPS) technology called Real Application Clusters. In the
past, OPS had been primarily used for availability, because there
were performance penalties for using OPS with OLTP and some other
types of applications.

Real Application Clusters have eliminated these problems, making it
possible for most applications to scale over a cluster of machines.
Oracle claims that with Real Application Clusters, each new machine
can add as much as 90% of the performance of the standalone machine.
Even if this new technology doesn't reach these
heights, you can still deploy the same application on a Real
Application Cluster that you can on a single database server, with
the capability of adding more nodes to the cluster, rather than
upgrading your database server to increase overall throughput.

Oracle Database
10g has added cluster workload management, a
feature that lets you specify how different services, or workloads,
use the nodes in a cluster. Cluster workload management gives you the
ability to provision the nodes in a cluster to different parts of the
overall application workload.

Real Application Clusters are discussed in more detail in Chapter 8.