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Issue:
Receiving TNS-12564: TNS:connection refused when trying to startup my instance.

Reason:
The "TNS-12564: TNS:connection refused when trying to startup my instance" was caused by a memory issue. My newly created instance on my RAC was causing memory issues.

Fix:
I modified the Total SGA Size (MB) setting via Database Control on my old instance, so that I could startup my new instance.

 

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