Log status:
■ UNUSED - Online redo log has never been written to. This is the state
of a redo log that was just added, or just after a RESETLOGS, when it
is not the current redo log.
■ CURRENT - Current redo log. This implies that the redo log is active.
The redo log could be open or closed.
■ ACTIVE - Log is active but is not the current log. It is needed for
crash recovery. It may be in use for block recovery. It may or may not
be archived.
■ CLEARING - Log is being re-created as an empty log after an ALTER
DATABASE CLEAR LOGFILE statement. After the log is cleared, the
status changes to UNUSED.
■ CLEARING_CURRENT - Current log is being cleared of a closed
thread. The log can stay in this status if there is some failure in the
switch such as an I/O error writing the new log header.
■ INACTIVE - Log is no longer needed for instance recovery. It may be
in use for media recovery. It might or might not be archived.[@more@]

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V$LOG.STATUS

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