查版本：
select * from v$instance;
or
select * from product_component_version;
当前用户每个表占用空间：
Select Segment_Name,Sum(bytes)/1024/1024 From User_Extents Group By Segment_Name;
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;
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