1. Database Reference
  2. Dynamic Performance Views
  3. Dynamic Performance (V$) Views: V$SCHEDULER_RUNNING_JOBS to V$ZONEMAP_USAGE_STATS
  4. V$STANDBY_LOG

9.81 V$STANDBY_LOG

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.
Column Datatype Description

GROUP#

NUMBER

Log group number

DBID

VARCHAR2(40)

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.

THREAD#

NUMBER

Log thread number

SEQUENCE#

NUMBER

Log sequence number

BYTES

NUMBER

Size of the log (in bytes)

BLOCKSIZE

NUMBER

Block size of the logfile (512 or 4096)

USED

NUMBER

Number of bytes used in the log

ARCHIVED

VARCHAR2(3)

Archive status (YES) or (NO). See the STATUS column for further details.

STATUS

VARCHAR2(10)

Log status:

  • UNASSIGNED - If ARCHIVED is NO, then the standby redo log has been archived and is again available.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.

FIRST_CHANGE#

NUMBER

Lowest SCN in the log

FIRST_TIME

DATE

Time of the first SCN in the log

NEXT_CHANGE#

NUMBER

All redo records contained within this log will have an SCN lower than NEXT_CHANGE#. Only filled in once the log is complete. Also the lowest SCN of any redo record in the next log.

NEXT_TIME

DATE

All redo records contained within this log will have a timestamp lower than NEXT_TIME. Only filled in once the log is complete. Also the lowest timestamp of any redo record in the next log.

LAST_CHANGE#

NUMBER

All redo records contained within this log will have an SCN lower than LAST_CHANGE#. Only filled in once the log is complete. Also the lowest SCN of any redo record in the next log.

LAST_CHANGE# is deprecated. Use NEXT_CHANGE# instead.

LAST_TIME

DATE

All redo records contained within this log will have a timestamp lower than LAST_TIME. Only filled in once the log is complete. Also the lowest timestamp of any redo record in the next log.

LAST_TIME is deprecated. Use NEXT_TIME instead.

CON_ID

NUMBER

The ID of the container to which the data pertains. Possible values include:

  • 0: This value is used for rows containing data that pertain to the entire CDB. This value is also used for rows in non-CDBs.

  • 1: This value is used for rows containing data that pertain to only the root

  • n: Where n is the applicable container ID for the rows containing data