Skip to main content

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.

Comments

Post a Comment

Popular posts from this blog

SAAS Simple Maturity Model

There are two architectural models – commonly referred as SAAS Maturity models- that describe the transition of a service to what is called Multi-tenant efficient, highly scalable application. The SAAS Maturity model described by Microsoft has four distinct stages and is illustrated below. Another similar well-known model for SaaS-maturity is known as Forrester-model but adds another stage known as "Dynamic Business Apps-as-a-service". The three key Attributes of a SAAS Architecture: Configurability: Metadata used to configure the way the application behaves for customers Multi-tenant Efficiency : Maximizing the sharing of resources across tenants Scalability: Maximizing concurrency, resource efficiency SAAS Simple Maturity Model (Microsoft, 2006) SaaS Maturity Model (Forres...
Post a Comment
Read more

CXF Example –Web Service Using Spring and Maven

Apache CXF is an open source services framework. CXF helps you build Web Services using frontend programming APIs, like JAX-WS and JAX-RS. These services can speak a variety of protocols such as SOAP, XML/HTTP, RESTful HTTP, or CORBA and work over a variety of transports such as HTTP, JMS or JBI. Support for bottom up approach and top down approach. Support for Standards JAX-WS, JSR-181, SAAJ, JAX-RS SOAP 1.1, 1.2, WS-I BasicProfile, WS-Security, WS-Addressing, WS-RM, WS-Policy WSDL 1.1 MTOM Building Web Services – Example 1 Develop a simple Web Service using CXF framework. The example in this case is an InterestRate Service. Tools / technologies Version CXF 2.1 Maven 2.0 Tomcat apache-tomcat-6.0.24 JDK java version 1.6.0_20       The Application Scope The "Interest Rate Service" application demonstrates how easily you can develop a Web Service using CXF frame work. The WSDL service definition defines three operations. Below is the InterestRateService interface.   @WebS...
2 comments
Read more

What is an ESB?

ESB is another of these amorphous terms that means different things to different people. An ESB can be thought of as the next generation of Service Oriented Architecture. Everybody knows web services today, and they have been used extensively to allow companies to break the tyranny of proprietary architectures. Now you can wire applications to service providers without having to know or worry about the provider's underlying operating system or programming language. It is an architectural concept/construct - not a technology, despite some vendors (and even gartner) telling you otherwise. You'll find many different types of technology can fulfil the conceptual role of an ESB, hence be careful not to associate it with a particular technology. Therefore designing the architecture is more important than choosing a 'product'. An Enterprise Service Bus (ESB) is the "backbone" of the service-oriented architectural model which allows different protocols to be communica...
Post a Comment
Read more