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Oracle scalability solutions - Oracle RAC

RAC stands for Real Application Clusters. Oracle has a host of tools that facilitate scalability. Oracle RAC is commonly used for scalable Oracle solutions. Oracle Real Application Cluster (RAC) allows multiple nodes in a clustered environment to mount and open a single database that resides on shared disk storage. Should a single system (node) fail, the database service will still be available on the remaining nodes.

RAC has the ability to quickly add an entire server to a cluster increasing the horsepower without effecting end-user response time. RAC is a recommended solution when you have saturated a single server.

Grid Computing
The idea of Grid computing arose from the need to solve highly-parallel computational problems that were beyond the processing capability of any single computer. Oracle Grid computing technology represents a significant rethinking of the traditional role of software infrastructure in areas such as system performance, clustering and storage.

What is a Scale up approach?
In this approach, server resources (CPU, RAM, Disk) can be added into a single, monolithic server, which can have slots for up to 64 CPU’s and over 256 Gigabytes of RAM.  Eg: HP Superdome (64 CPU), the Unisys ES-7000 Series (32 Processors), the Sun Microsystems SunFire and the IBM X and Regatta class servers.

What is Scale out approach?
The "scale out" approach is designed for super large Oracle databases that support many thousands of concurrent users. Unless the system has a need to support more than 10,000 transactions per second, it is likely that the system will benefit more from a scale up approach.

In the real world, managing vary large number of transactions, a scale up scale out approach may be used. Organizations start with a large vertical architecture server, adding resources as-needed. If continuous availability is also required, they may have a mirrored server using long-distance RAC or Oracle Streams.

Amazon is an excellent example of a scale out Oracle scale out approach.  Amazon announced plans to move their 14 trillion byte Oracle database to Oracle RAC on Linux and Amazon uses load-balanced Linux Web servers to horizontally scale its Web presence to millions of connected users.

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