ORA-04930: open sequence number failed or initial state is valid

Cause: Either Shared Sequence Number OS component was not installed properly, or an MC hardware failure may have occurred or a previous instance was not shut down properly.

Action: Verify that there are no background or foreground Oracle processes from a previous instance on this node using the OS command ps -ef|grep <instance_name>. Verify that there are no shared memory segments belonging to the user which owns the Oracle installation by isuing the ipcs -b OS command. If there are shared memory segments or processes still on the system, use svrmgrl to shutdown the instance with the abort option. If the instance is not up, verify that the cluster software and/or the hardware is installed and working. Log in as superuser and issue the cnxshow command. Are all of the nodes in the cluster listed? Are they members of the cluster? Is the communications between nodes okay? If the answer to any of these questions is false, contact Digital's customer support organization.

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ORA-04931: unable to set initial sequence number value

Cause: A call to the SSN failed to set the sequence number to its initial value, possibly caused by an MC hardware problem.

Action: Verify that the MC hardware is functioning properly. If it is not, contact Digital's customer support organization. If it is, contact Oracle support.

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ORA-04934: unable to obtain the current sequence number

Cause: A call to the SSN failed to return its current value. Either there are many errors occurring on the MC hardware, or the sequence number has become invalid and cannot be validated.

Action: Verify that the MC hardware is functioning properly. If it is, contact Oracle Support.

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