Testing the configuration
To ensure reliable operations in the cluster:
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Start database instances at the same time on all desired nodes.
This verification confirms multiple node access to the database.
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Start listeners on all nodes using the host names specified in the listener.ora configuration files.
This action may require configuring IP aliases on servers.
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Verify all instances are registered with all the listeners.
This critical step ensures clients can connect to any listener to access any instance.
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Verify the client systems can access the new database.