ORA-00252: log string of thread string is empty, cannot archive
What triggered the Error:
A log must be used for redo generation before it can be archived. The specified redo log was not been used since it was introduced to the database. However it is possible that instance death during a log switch left the log empty.What should we do to fix it:
Empty logs do not need to be archived. Do not attempt to archive the redo log file.
If this was not sufficient go over to:
Oracle Official Support Knowledge Center
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Or maybe those geeks at: StackOverflow Board