Oracle RAC Questions and Answers

25. What is the benefit of using Virtual IP (VIP)?
 
  • Whenever an application uses VIP to connect to a database, it can failover to another available node in case of a failure of one node.
  • You need to use VIP as the host name in the Transparent Network Substrate (TNS) entry to use VIP.
 
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26. What is the use of RMSn?
  RMNs are RAC Management Processes. These processes manage RAC and create more resources whenever new instances are added to RAC.
 
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27. Explain the software component of RAC?
 
  • In a RAC set up, each node has an instance similar to a non RAC database.
  • Each instance in RAC has its own memory structures and background processes.
  • Oracle RAC instances use two processes: GRS (Global Enqueue Service) and GCS( Global Cache Service) that enable cache fusion.
 
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28. Which tools are available to manage RAC environment?
  RAC can be managed using Oracle Enterprise Manager (OEM), Server Control Utility (srvctl) and Database Configuration Assistant (DBCA).
 
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