ORA-16140: standby online logs have not been

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ORA-16140: standbyonline logs have not been recovered
Cause: The standby database has online logs containing redothat has not been
recovered. Activating the standby would lose redo contained in the online logs.
Action: Torecover the standby online logs issue the following command: ALTER
DATABASE RECOVER MANAGED STANDBY DATABASE FINISH. Then reissue
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.