16808, 0000, "primary database is not open"
*Cause: A prior attempt to open the primary database was disallowed
because the primary had shut itself down earlier after being
isolated from both the fast-start failover observer and the
target standby database for more than FastStartFailoverThreshold
seconds. It was assumed that a fast-start failover was underway.
Since that time, re-contact with either the observer or the target
standby database indicates that no such failover had actually
occurred. The primary database can now be opened.
*Action: Open the database by issuing the SQL*Plus ALTER DATABASE OPEN