Oracle Error Message
ORA-16444: ALTER SYSTEM FLUSH REDO TO STANDBY failed due to a corrupted control file or online log file.
Reason for the Error
A flush redo operation discovered SCNs greater than a previously failed flush redo operation.
Solution
This can happen if there are one or more errors that have corrupted the control file or online redo logs. In these cases, flush redo operation is not possible.