x or later. Otherwise, each node will have its own copy of the binary executables.
Network Configuration
Each node in a RAC has a minimum of three IP addresses: one for the public network, one for the
private network interconnect, and a virtual IP address to support faster failover in the event of a
node failure. As a result, a minimum of two physical network cards are required to support RAC;
352 Oracle Database 11g DBA Handbook
additional network cards are used to provide redundancy on the public network and thus an
alternate network path for incoming connections. For the private network, additional network
cards can boost performance by providing more total bandwidth for interconnect traffic. Figure
10-1 shows a two-node RAC with one network card on each node for the private interconnect
and one network card on each node to connect to the public network.
The public network is used for all routine connections to and from the server; the interconnect
network, or private network, supports communication between the nodes in the cluster, such as
node status information and the actual data blocks shared between the nodes. This interface
should be as fast as possible, and no other types of communication between the nodes should
occur on the private interface; otherwise, the performance of the RAC may suffer.
The virtual IP address is the address assigned to the Oracle listener process and supports rapid
connect-time failover, which is able to switch the network traffic and Oracle connection to a different
instance in the RAC much faster than a third-party high-availability solution.
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