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Oracle® Database Reference
12c Release 1 (12.1)

E17615-23
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V$DATAFILE_HEADER

V$DATAFILE_HEADER displays data file information from the data file headers.

Column Datatype Description
FILE# NUMBER Data file number (from control file)
STATUS VARCHAR2(7) ONLINE | OFFLINE (from control file)
ERROR VARCHAR2(18) NULL if the data file 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 data file 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, 10 or 0.

6 - indicates Oracle Version 6

7 - indicates Oracle Version 7

8 - indicates Oracle Version 8

10 - indicates Oracle Version 10

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 Data file creation change#
CREATION_TIME DATE Data file creation timestamp
TABLESPACE_NAME VARCHAR2(30) Tablespace name
TS# NUMBER Tablespace number
RFILE# NUMBER Tablespace relative data file number
RESETLOGS_CHANGE# NUMBER Resetlogs change#
RESETLOGS_TIME DATE Resetlogs timestamp
CHECKPOINT_CHANGE# NUMBER Data file checkpoint change#
CHECKPOINT_TIME DATE Data file checkpoint timestamp
CHECKPOINT_COUNT NUMBER Data file checkpoint count
BYTES NUMBER Current data file size in bytes
BLOCKS NUMBER Current data file size in blocks
NAME VARCHAR2(513) Data file name
SPACE_HEADER VARCHAR2(40) Represents the block address of a space file header block of a locally managed data file
LAST_DEALLOC_CHANGE# VARCHAR2(16) Last deallocated SCN
UNDO_OPT_CURRENT_CHANGE# VARCHAR2(40) For internal use only
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