Oracle Error ORA-38858: cannot mark redo thread string as enabled

Oracle Error Message

ORA-38858: cannot mark redo thread string as enabled

Reason for the Error

The open resetlogs or standby activation operation failed because it needs to mark a redo thread as enabled. However, the control file was recreated with a MAXINSTANCES value smaller than the thread number of the redo thread.

Solution

Recreate the control file with a larger MAXINSTANCES value.