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Oracle Tips by Burleson |
Real Application Clusters
Let's take a more detailed look at Oracle
RAC. The RAC architecture provides:
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Cache Fusion
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True scalability
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Enhanced reliability
RAC allows the DBA true transparent
scalability. In order to increase the number of servers in almost
all other architectures, including Oracle's previous OPS, data and
application changes were required or in many cases performance would
actually get worse. With RAC:
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All Applications Scale – No tuning
required
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No Physical Data Partitioning required
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ISV Applications Scale out of the
box
This
automatic, transparent scaling is due almost entirely to the RAC's
cache fusion and the unique parallel architecture of the RAC
implementation on Oracle. Since the processing of requests is
spread across the RAC instances evenly and all access a single
database image instead of multiple images, addition of a server or
servers requires no architecture changes, no remapping of data and
no recoding. In addition, failure of a single node results in only
loss of its addition to scalability, not in loss of its data since a
single database image is utilized.
See Code Depot
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