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Oracle Coherence: A RAC alternative?
Oracle Tips by Burleson Consulting
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Oracle is approaching many avenues
towards continuous availability, offering many solutions like
Real Application Clusters, Oracle Failsafe and now
Oracle Coherence, an application server-level caching
product.
Formerly the
Tangosol product which was acquired in 2007 by Oracle, the
newly-dubbed Oracle Coherence appears to be remarkably similar
to the original offering.
Internally, Oracle Coherence is just a Java
"clustered cache" platform for the application server, sharing data between
nodes in a cluster via a RAM cache, essentially a middleware-based distributed
RAM cache for frequently-used data.
Because Coherence bypasses the Oracle data buffers
by sharing at the app server level, it is sometimes a simpler solution that RAC
for certain applications.
Tangosol is very similar to the "Times Ten"
product which was recently purchased by Oracle, with the exception that Times
Ten does not do data distribution.
