SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
1 1 38 52428800 1 NO INACTIVE 1678937 07-APR-13
2 1 39 52428800 1 NO CURRENT 1708375 08-APR-13
3 1 37 52428800 1 NO INACTIVE 1641414 07-APR-13
GROUP# Log group
THREAD# Log thread
SEQUENCE# Log sequence
BYTES Size of the log (in bytes)
MEMBERS of members in the log group
ARCHIVED VARCHAR2(3) Archive status (YES or NO)
STATUS Log status:
UNUSED - Online redo log has never been written to. This is the state of a redo log that was just added, or just after a RESETLOGS, when it is not the current redo log.
CURRENT - Current redo log. This implies that the redo log is active. The redo log could be open or closed.
ACTIVE - Log is active but is not the current log. It is needed for crash recovery. It may be in use for block recovery. It may or may not be archived.
CLEARING - Log is being re-created as an empty log after an
ALTER DATABASE CLEAR LOGFILE statement. After the log is cleared, the status changes to UNUSED.
CLEARING_CURRENT - Current log is being cleared of a closed thread. The log can stay in this status if there is some failure in the switch such as an I/O error writing the new log header.
INACTIVE - Log is no longer needed for instance recovery. It may be in use for media recovery. It might or might not be archived.
INVALIDATED - Archived the current redo log without a log switch.
FIRST_CHANGE# Lowest system change (SCN) in the log
FIRST_TIME DATE Time of the first SCN in the log
SQL> select * from v$logfile;
GROUP# STATUS TYPE MEMBER IS_
---------- ------- ------- ---------------------------------------------------------------------------------
3 ONLINE /home/oracle/10.2.0/product/oradata/orcl/redo03.log NO
2 ONLINE /home/oracle/10.2.0/product/oradata/orcl/redo02.log NO
1 ONLINE /home/oracle/10.2.0/product/oradata/orcl/redo01.log NO
GROUP# Redo log group identifier number
STATUS Status of the log member:
INVALID - File is inaccessible
STALE - File's contents are incomplete
DELETED - File is no longer used
null - File is in use
TYPE Type of the logfile:
ONLINE
STANDBY
MEMBER R edo log member name
IS_RECOVERY_DEST_FILE Indicates whether the file was created in the flash recovery area (YES) or not (NO)
SQL> select * from v$log_history;
RECID STAMP THREAD# SEQUENCE# FIRST_CHANGE# FIRST_TIM NEXT_CHANGE# RESETLOGS_CHANGE# RESETLOGS
---------- ---------- ---------- ---------- ------------- --------- ------------ ----------------- ---------
1 810903173 1 1 525876 24-MAR-13 556543 525876 24-MAR-13
2 811006590 1 2 556543 24-MAR-13 615576 525876 24-MAR-13
3 811020025 1 3 615576 25-MAR-13 636527 525876 24-MAR-13
4 811029938 1 4 636527 25-MAR-13 656691 525876 24-MAR-13
RECID Control file record ID
STAMP Control file record stamp
THREAD# Thread of the archived log
SEQUENCE# Sequence of the archived log
FIRST_CHANGE# Lowest system change (SCN) in the log
FIRST_TIME Time of the first entry (lowest SCN) in the log
NEXT_CHANGE# Highest SCN in the log
RESETLOGS_CHANGE# Resetlogs change of the database when the log was written
RESETLOGS_TIME Resetlogs time of the database when the log was written
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