Services are groups or classifications of applications that comprise business components that extend and respond to application workloads. Examples of services are Accounts Payable (AP), Customer Relationship Management (CRM), and so on. Services in Oracle Real Application Clusters (Oracle RAC) enable continuous, uninterrupted database operations to support multiple services on multiple instances.
Services enable Oracle RAC to integrate cluster database resources into a single system image to optimize cluster manageability. This simplifies system deployment, testing, and disaster recovery and administrative overhead. With services, users connect to a database without regard for which instance executes the SQL application service.
You assign services to run on one or more instances, and alternate instances can serve as backup instances in case the primary instance fails. If a primary instance fails, Oracle moves the service from the failed instance to a surviving alternate instance.
Services enable you to model and deploy both planned and unplanned operations for all types of high availability or disaster recovery scenarios. During outages, Oracle RAC automatically restarts key components. Components that are eligible for automatic restart include instances, Oracle Net Services listeners, and the database as well as several database subcomponents.
About Real Application Clusters
Managing Cluster Managed Database Services
Enterprise Manager Information Roadmap
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