ORA-12522: TNS:listener could not find available instance with given INSTANCE_ ROLE
Cause: There are not any available and appropriate database instances registered with the listener, that are part of the service identified by SERVICE_NAME given in the connect descriptor and that have the specified INSTANCE_ROLE (and INSTANCE_NAME, if specified).
Action: Check to make sure that the INSTANCE_ROLE specified is correct. Run lsnrctl services to ensure that the instance(s) have registered with the listener and that they are ready to accept connections.
Cause: There are not any available and appropriate database instances registered with the listener, that are part of the service identified by SERVICE_NAME given in the connect descriptor and that have the specified INSTANCE_ROLE (and INSTANCE_NAME, if specified).
Action: Check to make sure that the INSTANCE_ROLE specified is correct. Run lsnrctl services to ensure that the instance(s) have registered with the listener and that they are ready to accept connections.
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