Friday, July 25, 2008

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

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