Oracle8i Reference
Release 2 (8.1.6)

Part Number A76961-01

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Dynamic Performance (V$) Views, 36 of 179


V$DATAFILE_HEADER

This view 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(512) 

Datafile name 


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