Of course,
since AS is focused on running applications rather than storing data, these functions
are not nearly as complex as the similar functionality available for the database,
which must support thousands of potential users.
Figure 15-2. Multiple levels of clustering in Oracle Application Server
Web Cache Cluster
OHS Cluster
OC4J Cluster
Web
cache
instance
Web
cache
instance
Web
cache
instance
OHS
instance
OHS
instance
OHS
instance
OC4J
instance
OC4J
instance
OC4J
instance
OC4J
instance
OC4J
instance
OC4J
instance
OC4J
instance
OC4J
instance
OC4J
instance
344 | Chapter 15: Beyond the Oracle Database
AS can be installed to use underlying hardware cluster functionality in what is called
a Cold Failover Cluster. This configuration uses a shared disk attached to multiple
machines. If the primary server should fail, operations fail over to a backup server.
Oracle Application Server 10g also supports Active Failover Clusters (AFCs)
(although the initial release of AS 10g did not support this configuration in a production
environment).
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