V$STANDBY_LOG displays information about standby redo logs. Standby redo logs are similar to online redo logs, but standby redo logs are only used on a standby database that is receiving redo data from the primary database.
Log group number
Database ID of the primary database to which the standby redo logfile is assigned. If the standby redo logfile is unassigned, the value UNASSIGNED will be displayed.
Log thread number
Log sequence number
Size of the log (in bytes)
Number of bytes used in the log
Archive status (YES) or (NO). See the STATUS column for further details.
UNASSIGNED - If ARCHIVED is NO, then the standby redo log has been archived and is again available. If ARCHIVED is YES, then the standby redo log has never been used and is available.
ACTIVE - If ARCHIVED is NO, then the standby redo log is complete and waiting to be archived. If ARCHIVED is YES, then the standby redo log is currently being written to and is therefore not ready to be archived. For a given thread, there should be only one such log.
Lowest SCN in the log
Time of the first SCN in the log
Last change number made to this datafile. Set to NULL if the datafile is being changed.