V$FILESPACE_USAGE summarizes space allocation information of each datafile and tempfile.
| Column | Datatype | Description | 
|---|---|---|
TABLESPACE_ID | 
NUMBER | 
ID of the tablespace to which the file belongs | 
RFNO | 
NUMBER | 
Relative file number of the file | 
ALLOCATED_SPACE | 
NUMBER | 
Total allocated space in the file | 
FILE_SIZE | 
NUMBER | 
Current file size | 
FILE_MAXSIZE | 
NUMBER | 
Maximum file size | 
CHANGESCN_BASE | 
NUMBER | 
SCN base of the last change to the file | 
CHANGESCN_WRAP | 
NUMBER | 
SCN wrap of the last change to the file | 
FLAG | 
NUMBER | 
Flags for file attributes |