DBA_FREE_SPACE

Oracle 11gR1

DBA_FREE_SPACE describes the free extents in all tablespaces in the database.

Note that if a datafile (or entire tablespace) is offline in a locally managed tablespace, you will not see any extent information. If an object has extents in an online file of the tablespace, you will see extent information about the offline datafile. However, if the object is entirely in the offline file, a query of this view will not return any records.

Related View

USER_FREE_SPACE describes the free extents in the tablespaces accessible to the current user.

Column	Datatype	NULL	Description
TABLESPACE_NAME	VARCHAR2(30)		Name of the tablespace containing the extent
FILE_ID	NUMBER		File identifier number of the file containing the extent
BLOCK_ID	NUMBER		Starting block number of the extent
BYTES	NUMBER		Size of the extent (in bytes)
BLOCKS	NUMBER		Size of the extent (in Oracle blocks)
RELATIVE_FNO	NUMBER		Relative file number of the file containing the extent

Oracle data dictionary views