ORA-16140: standby online logs have not been recovered
Cause: The standby database has online logs containing redo that has not been recovered. Activating the standby would lose redo contained in the online logs.
Action: To recover the standby online logs issue the following command: ALTER DATABASE RECOVER MANAGED STANDBY DATABASE FINISH. Then re-issue the ALTER DATABASE ACTIVATE STANDBY DATABASE command. To activate the standby without recovering the online logs, issue the following command: ALTER DATABASE ACTIVATE STANDBY DATABASE SKIP STANDBY LOGFILE.
Error Type: ORA