What are Oracle RAC components?
What are Oracle RAC components?
At a very high level, RAC architecture consists of these components:
- Physical Nodes or Hosts.
- Physical Interconnects and interconnect protocols.
- Cluster Manager Software and Cluster Ready Services.
- Oracle Instances and Cache Fusion.
- Shared Disk System.
- Clustered File System, Raw Devices, Automatic Storage Management.
What is Oracle RAC server?
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 is Oracle RAC heartbeat?
Answer: A heartbeat is a polling mechanism, similar to a ping, that monitors the availability of other servers in a RAC system. The heartbeat is a type of polling mechanism that is sent over the cluster interconnect to ensure that all RAC nodes are available. The heartbeat is part of the clusterware node monitoring.
What is the purpose of Oracle RAC?
Aims. The main aim of Oracle RAC is to implement a clustered database to provide performance, scalability and resilience & high availability of data at instance level.
How does Oracle RAC work?
What is node eviction in RAC?
A node eviction is done when a heartbeat indicates that a node is not responding, and the evicted node is re-started so that it can continue to partiipate in the cluster.
What is split brain in RAC?
Split Brain is often used to describe the scenario when two or more nodes in a cluster, lose connectivity with one another but then continue to operate independently of each other, including acquiring logical or physical resources, under the incorrect assumption that the other process(es) are no longer operational or …
What causes node eviction in Oracle RAC?
When you have a three node cluster, two nodes will survive a node eviction, and so on. A node eviction is done when a heartbeat indicates that a node is not responding, and the evicted node is re-started so that it can continue to partiipate in the cluster.
What is voting disk in RAC?
Voting Disks in Oracle RAC Description Voting disk is a file that manages information about node membership.It is located on the shared cluster system or a shared raw device file or Oracle ASM(11gr2 onwards) . Its primary purpose is to help in a situation where the private network communication fails.