Hi Norman, > (SELECT VALUE > FROM v$parameter > WHERE NAME = 'db_block_size') * SUM (a.blocks) / 1024 > used_mb if I'm not completely wrong this should by used_Kb (not used_mb) alternatively ... WHERE NAME = 'db_block_size') * SUM (a.blocks) / (1024 * 1024) used_mb Regards, Jaromir -- //www.freelists.org/webpage/oracle-l