"log %s of thread %s is being cleared, cannot become current log"
*Cause: An attempt to switch to a new online log for the redo thread
failed because no reusable log could be found. This log is being
cleared and will be useable when the clearing completes. The
command that began the clearing may have terminated without
completing the clearing.
*Action: If the clear command is still executing then wait for its
completion. If it terminated then reissue the clear command, or
drop the log.