1. 查某一用户下的表
select SEGMENT_NAME,TABLESPACE_NAME,sum(BYTES/1024/1024)||'M' from USER_extents where SEGMENT_TYPE='TABLE'group by SEGMENT_NAME,TABLESPACE_NAME2.查所有的表
select SEGMENT_NAME,TABLESPACE_NAME,sum(BYTES/1024/1024)||'M' from dba_extents where SEGMENT_TYPE='TABLE'group by SEGMENT_NAME,TABLESPACE_NAME