V$TEMP_SPACE_HEADER

This view displays aggregate information per file per temporary tablespace regarding how much space is currently being used and how much is free as per the space header.

Column	Datatype	Description
TABLESPACE_NAME	VARCHAR2(30)	The name of the temporary tablespace
FILE_ID	NUMBER	The absolute file number
BYTES_USED	NUMBER	How many bytes are in use
BLOCKS_USED	NUMBER	How many blocks are in use
BYTES_FREE	NUMBER	How many bytes are free
BLOCKS_FREE	NUMBER	How many blocks are free
RELATIVE_FNO	NUMBER	The relative file number for the file