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  Oracle Database Tips by Donald Burleson

Oracle10g Grid Computing with RAC
Chapter 6 - Install, Configure and Database Creation


If more than two nodes are interconnected in a cluster, they must be linked with a switch. Wherever possible, we must provide redundant interconnects by using dual switches. How do you detect which interconnect is used? The following commands show which interconnect is used for UDP or TCP:

sqlplus> connect / as sysdba
oradebug setmypid
oradebug ipc

The corresponding trace can be found in the user_dump_dest directory, and contains the following information in the last couple of lines:

SKGXPCTX: 0x32911a8 ctx
admno 0x12f7150d admport:
    info for network 0
  socket no 9 IP UDP 43307
  info for network 1
  socket no 0 IP UDP 0
context timestamp 0x1ca5
  no ports

When other protocols such as HMP or RDG are used, the trace file will not reveal the IP address.

The above text is an excerpt from:

Oracle 10g Grid & Real Application Clusters
Oracle 10g Grid Computing with RAC
ISBN 0-9744355-4-6

by Mike Ault, Madhu Tumma


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