SELECT A.tablespace_name tablespace, D.mb_total,
 SUM (A.used_blocks * D.block_size) / 1024 / 1024 mb_used,
 D.mb_total - SUM (A.used_blocks * D.block_size) / 1024 / 1024 mb_free
 FROM v$sort_segment A,
 (
 SELECT B.name, C.block_size, SUM (C.bytes) / 1024 / 1024 mb_total
 FROM v$tablespace B, v$tempfile C
 WHERE B.ts#= C.ts#
 GROUP BY B.name, C.block_size
 ) D
 WHERE A.tablespace_name = D.name
 GROUP by A.tablespace_name, D.mb_total;