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What does Oracle Clusterware do?
Oracle Clusterware is a portable cluster software that allows clustering of independent servers so that they cooperate as a single system.
What is Oracle Database cluster?
Oracle Real Application Clusters (RAC) allow customers to run a single Oracle Database across multiple servers in order to maximize availability and enable horizontal scalability, while accessing shared storage.
What are the uses of Real Application clusters?
What are the components of Oracle Clusterware?
The Oracle Clusterware includes two important components: the voting disk and the Oracle Cluster Registry (OCR). The voting disk is a file that manages information about node membership and the OCR is a file that manages cluster and Oracle Real Application Clusters (Oracle RAC) database configuration information.
What is Oracle RAC architecture?
RAC Architecture. Oracle Real Application clusters allows multiple instances to access a single database, the instances will be running on multiple nodes. In an standard Oracle configuration a database can only be mounted by one instance but in a RAC environment many instances can access a single database.
What is Oracle Oraagent?
Oracle ASM: Provides disk management for Oracle Clusterware and Oracle Database. Cluster Time Synchronization Service (CTSS): Provides time management in a cluster for Oracle Clusterware. Oracle Agent (oraagent): Extends clusterware to support Oracle-specific requirements and complex resources.
What does Oracle 10 g real application cluster mean?
A cluster comprises multiple interconnected computers or servers that appear as if they are one server to end users and applications. Oracle Database 10 g Real Application Clusters (Oracle RAC) enables the clustering of the Oracle Database.
How does Oracle Clusterware work with Oracle RAC?
Oracle Clusterware is a portable cluster management solution that is integrated with the Oracle database. The Oracle Clusterware is also a required component for using Oracle RAC. In addition, Oracle Clusterware enables both single-instance Oracle databases and Oracle RAC databases to use the Oracle high availability infrastructure.
What is the background process in Oracle Clusterware?
The Oracle Clusterware comprises several background processes that facilitate cluster operations. The Cluster Synchronization Service (CSS), Event Management (EVM), and Oracle Cluster components communicate with other cluster component layers in the other instances within the same cluster database environment.
How does Oracle database work in a cluster?
On each of the hosts in the cluster, an Oracle Database instance is launched that uses the shared storage structures to provide the logical database objects. Thus, the multiple database instances provide a common database access for the users.