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Oracle RAC Interview Questions and Answers

1
What is the main purpose of Oracle Real Application Clusters (RAC)?
  • Oracle Real Application (RAC) provides the interaction of executable file with the Oracle database.
  • It allows the running of any packaged or custom built application with the Oracle database that is running on a server pool.
  • It provides very high level of availability, flexibility and scalability to run the application and store it to the database.
  • It creates the database such that if the pool fails then the database is continued to run from the remaining servers and the load can be distributed.
  • It makes it easier for the administrator to maintain many servers at the same time by load-balancing techniques and providing provision to add more and more servers when the load increases.
2
Where are the Clusterware files stored on a RAC environment?

The Clusterware is installed on each node (on an Oracle Home) and on the shared disks (the voting disks and the CSR file)

3
What is SCAN?

Single Client Access Name (SCAN) is s a new Oracle Real Application Clusters (RAC) 11g Release 2 feature that provides a single name for clients to access an Oracle Database running in a cluster. The benefit is clients using SCAN do not need to change if you add or remove nodes in the cluster.

4
What is required by Oracle RAC database to connect to a network?
  • Oracle RAC requires an active connection of the network to the LAN (Local Area Network) so that the database server can be found and connected.
  • The database server is further having connections with application servers that store the applications and allow user to transfer their data.
  • The connection is required with the server pool so that the transfer of services and applications can be done on demand basis.
  • The interconnection between the networks is really important as it has to maintain the overall flow of the pools and the resources.
  • Oracle RAC provides support to redundant interconnects relatively and it provides an overall infrastructure solution.
  • The load balancing and inter-node messaging can be handled more carefully when the networks or the servers are interconnected to each other.
5
How is possible to install a RAC if we don’t have a CFS?

This is possible by using a raw device.

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