"log %s is current log for instance %s (thread %s) - cannot drop"
*Cause: A thread's current log cannot be dropped even if the thread is
closed. A disabled thread usually does not have a current log,
but a half completed disable may need to be disabled again.
*Action: If the database is not open then disable the thread. If the
database is open and an instance has the thread open, then the
instance can be requested to switch logs. If the database is
closed the log can be archived or cleared to force a switch.