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Oracle Tips by Burleson |
Oracle10g Grid Computing
with RAC
Chapter 12 - RAC Design Considerations
Designing for High Performance
Designing
for high performance means that every tier of the design must
eliminate contention for resources. If there is no contention, then
each process gets the resources it needs to perform optimally.
Resources fall into multiple categories: physical, as in disk and
network, and internal, such as CPU speed and memory capacity.
Designing for performance means utilizing these resources properly and
not relying on memory or disk resources to make up for poor
application design.
As with
normal databases, the application design will drive performance. The
finest equipment will not make up for a poor application design. In
the days of Oracle Parallel Server (OPS), Oracle recommended partitioning the application data and the
servers to make OPS perform. Now, Oracle salesmen insist that any
application can be run with RAC, with no need for changes.
To add
capacity, just add a server and bingo, more capacity is provided and
more users, no matter what they do with the application, can connect.
This all sounds wonderful until the manual Oracle9i Real Application
Clusters Deployment and Performance, Release 1 (9.0.1), Part No.
A96598-01, chapter 3, Scaling Applications for Real Application
Clusters, and Chapter 4, Scaling Applications for Real Application
Clusters, is consulted. There, Oracle recommends partitioning both the
application data and the users to optimize performance. This
unfortunate fact is omitted from the 9.2 and 10g versions of the
manual, which seems to indicate the automated tuning features of 9.2
and 10g relieve the DBA of this arduous task.
For more information,
see the book
Oracle 11g
Grid and Real Application Clusters 30% off if you
buy it directly from Rampant TechPress .
Written by top Oracle
experts, this RAC book has a complete online code depot with
ready to use RAC scripts.
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