oracle查看用户所占用的表空间

select *
  from (select owner || '.' || tablespace_name name, sum(b) g
          from (select owner,
                       t.segment_name,
                       t.partition_name,
                       round(bytes / 1024 / 1024 / 1024, 2) b,
                       tablespace_name
                  from dba_segments t)
         where owner not in
               ('SYS', 'OUTLN', 'SYSTEM', 'TSMSYS', 'DBSNMP', 'WMSYS')
         group by owner || '.' || tablespace_name)
 order by name;