select * from all_tables where owner = '用户名'
查询某个表的大小(单位是GB):
SELECT t.bytes/1024/1024/1024 FROM user_segments t where t.segment_name='DJ_SZ'
select * from all_tables where owner = '用户名'
SELECT t.bytes/1024/1024/1024 FROM user_segments t where t.segment_name='DJ_SZ'