二、查看当前用户每个表占用空间的大小：Select Segment_Name,Sum(bytes)/1024/1024 From User_Extents Group By Segment_Name 查看每个表空间占用空间的大小：Select Tablespace_Name,Sum(bytes)/1024/1024 From Dba_Segments Group By Tablespace_Name as4101 lsnrctl startas4101 svrmg