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Chapter 2  Grid, Utility Computing and Clusters 

Open Grid Services Architecture

What is WebService?

A Web Service is an interface that describes a collection of operations that are network accessible. They are built on XML based technologies and messaging. They use XML schemas to mark-up and describe services and their operations. Web Services commonly use the Simple Object Access Protocol (SOAP) as a communication protocol over HTTP- when this is not appropriate for performance reasons, a different protocol may be used.

It is the GSA that pulls together Open Grid Architecture and Web Services to form Grid Services. Grid Services are dynamic, transient, and have state (i.e., have a finite lifetime) and are defined by a well-defined set of interfaces and behaviors. OGSA interfaces and behaviors describing Grid Services can be written in an XML schema based WSDL document – other implementations are possible.

Perception of Grid

Since the Grid Architecture involves interoperability and sharing of resources within enterprise and across enterprises, we often wonder if the Grid is synonymous with Internet or if the grid is alternative to internet. Rather, the Grid is a set of additional protocols and services that build on Internet protocols and services to support the creation and use of computation and data-enriched environments. In addition, we need to note that any resource that is “on the Grid” is also, by definition, “on the Net.”

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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Our remote Oracle DBA service provides 100% of the remote Oracle database administration needs for your company, and includes 24x7 access to our staff of 100% OCP Certified Oracle DBAs. 

We require a 12 month service commitment and include the following services:

  • Initial configuration review and problem identification
  • Installation of Oracle statistics collection mechanisms and quarterly database growth summaries
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  • Twenty Four hour Oracle emergency support
  • Reporting and resolving all serious Oracle alert log messages
  • Free use of the BC TablePack, ServerPack and AuditPack services
  • Quick response emergency support for production database outages
  • Four hours of free remote DBA support every month. You can use these free hours for any DBA activity, including database analysis, system design, production migrations or personal mentoring.

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