Stupid question: what is the difference between RAC and Clusterware?
Hi allI'm about to start experimenting with the 11 G RAC Setup (to begin with, is that a cluster of a node, will try to add another later).
I am reading the docs... I'm on that of clusterware installation, and it seems to indicate that the clusterware and RAC are two different things?
http://download.Oracle.com/docs/CD/B28359_01/install.111/b28263/prelinux.htm#BABJHGBE
With quotes like "UDP is the default for Oracle RAC interconnect protocol and TCP is the Protocol of interconnection for Oracle Clusterware. You must use a switch for interconnection. Oracle recommends using a dedicated switch. "
Can someone tell me the difference? I know it sounds stupid, but it's confusing me, and I'm new on this.
Cayenne
Published by: cayenne on March 20, 2009 11:25
Published by: cayenne on March 20, 2009 11:25
You can make your http://www.oracle.com/technology/products/database/clusterware/clusterware_for_unbreakable_linux_faq.html#7 understand
What is the difference between the Oracle Clusterware and Oracle Real Application Clusters?
In case of failure of the system, put in cluster guarantees availability high for users. Redundant hardware components, such as the additional nodes, interconnection, and discs, allow the cluster to provide high availability. These redundant hardware architecture avoid the single points of failure and provide exceptional resilience fault.
In environments Oracle Real Application Clusters (RAC), Oracle Clusterware monitors and manages Real Application Cluster databases. When a node of the cluster is started, all instances, auditors and the services are started automatically. If an instance fails, the clusterware automatically restarts the instance, so that the service is often restored prior to the notice of the administrator, he was down. In this sense Oracle Clusterware is the base of Oracle Real Application Clusters.
In these environments CCR ensures the continuous operation of the database, but also scalability by running several bases of instance data at the same time, usually one on each node in the cluster.
Tags: Database
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