Clustering and load balancing
Oracle Application Server instances can be clustered together, for higher performance
and availability. Youcan cluster Web Cache, Java Container, Portal, Forms
Service, Report Servers (deprecated in Oracle Application Server 10g Release 2), or
OID instances. In addition, you can use Real Application Clusters to provide clustering
capabilities for the AS infrastructure or Portal. A multitier set of clusters is shown
in Figure 15-2.
mod_oc4j, which directs requests to the Oracle Container for Java from the Oracle
HTTP Server, provides load balancing across multiple instances of the Java Container,
based on several different types of schemes, including varieties of random
assignment, round robin, and metric-based. With Oracle Application Server 10g
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Release 2, an OC4J instance can host clustered and nonclustered applications at the
same time.
You can implement load balancing for either stateless requests or requests that carry
state. State-based load balancing is implemented with cookies and can be done either
explicitly or with Java Object Cache.
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