ORA-00294: invalid archivelog format specifier 'string'
What triggered the Error:
An invalid format specifier was found in the LOG_ARCHIVE_FORMAT initialization parameter. The only characters permitted following the % symbol are s, S, t, and T.What should we do to fix it:
Correct the initialization file and re-start the instance.
If this was not sufficient go over to:
Oracle Official Support Knowledge Center
Or maybe those geeks at: StackOverflow Board
Or maybe those geeks at: StackOverflow Board