The
Oracle database with RAC forms the foundation for the provisioning of these
resources.
Figure 12-6. Sample grid configuration, including computer blades and cluster
Grid Users, Grid Controls
Application Servers/Blades
Database Servers/Blades
Network Attached Storage
Network interconnects
300 | Chapter 12: Oracle and Hardware Architecture
Oracle Database 10g introduced several important features that enable the delivery
of resources when needed via a grid:
Dynamic Service Provisioning
This feature automatically allocates and reallocates server resources based on
configuration and failover rules. Service requests are automatically routed to the
server with the least load. If a server fails, the surviving services are automatically
reallocated to the available servers.
Web services
Web services are also an inherent part of the grid landscape, because applications
running on the grid want to use the same type of transparent access to
components (or services) that users have to applications. Database web services
provide support for queries, messaging, and DML, can access Java and PL/SQL,
and can provide full XML support.
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