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Only One Instance of a RAC Database Can Start at a Time: Second Instance Fails to Start due to "No reconfig messages from other instances" - LMON is terminating the instance (Doc ID 2528588.1)

Last updated on APRIL 17, 2023

Applies to:

Oracle Database - Enterprise Edition - Version and later
Information in this document applies to any platform.


In an otherwise healthy cluster with Grid Infrastructure fully up and running on all nodes, only one database instance can be started at a given moment.  Additional instances cannot not join. For example:


Here on the local address <privateIP_node2>:64828 it is trying to connect to the remote address <privateIP_node1>:50737 but it times out.

The port on node 2 was 64828 on the private IP <privateIP_node2> and on node 1 the port was 50737 on the private IP <privateIP_node1>.

It is because this communication is not happening, that is, the packets aren't getting through, that one can only start one instance at a time.


This can happen at database creation time or afterwards if there were changes to the network configuration.


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