V$DATAFILE_HEADER

Oracle 11gR1

V$DATAFILE_HEADER displays datafile information from the datafile headers.

Column	Datatype	Description
FILE#	NUMBER	Datafile number (from control file)
STATUS	VARCHAR2(7)	ONLINE | OFFLINE (from control file)
ERROR	VARCHAR2(18)	NULL if the datafile header read and validation were successful. If the read failed then the rest of the columns are NULL. If the validation failed then the rest of columns may display invalid data. If there is an error then usually the datafile must be restored from a backup before it can be recovered or used.
FORMAT	NUMBER	Indicates the format for the header block. The possible values are 6, 7, 8, or 0. 6 - indicates Oracle Version 6 7 - indicates Oracle Version 7 8 - indicates Oracle Version 8 0 - indicates the format could not be determined (for example, the header could not be read)
RECOVER	VARCHAR2(3)	File needs media recovery (YES | NO)
FUZZY	VARCHAR2(3)	File is fuzzy (YES | NO)
CREATION_CHANGE#	NUMBER	Datafile creation change#
CREATION_TIME	DATE	Datafile creation timestamp
TABLESPACE_NAME	VARCHAR2(30)	Tablespace name
TS#	NUMBER	Tablespace number
RFILE#	NUMBER	Tablespace relative datafile number
RESETLOGS_CHANGE#	NUMBER	Resetlogs change#
RESETLOGS_TIME	DATE	Resetlogs timestamp
CHECKPOINT_CHANGE#	NUMBER	Datafile checkpoint change#
CHECKPOINT_TIME	DATE	Datafile checkpoint timestamp
CHECKPOINT_COUNT	NUMBER	Datafile checkpoint count
BYTES	NUMBER	Current datafile size in bytes
BLOCKS	NUMBER	Current datafile size in blocks
NAME	VARCHAR2(513)	Datafile name
SPACE_HEADER	VARCHAR2(40)	The amount of space currently being used and the amount that is free, as identified in the space header
LAST_DEALLOC_SCN	VARCHAR2(16)	Last deallocated SCN

Oracle dynamic performance views