a2zinterviews

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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