1.通过查询dba_segments Select owner,segment_name,sum(bytes)/1024/1024 as MB from dba_segments group by owner,segment_name; 查询:是分配给一个表的物理空间数量,而不管空间是否被使用. 2.num_rows * avg_row_len select table_name, round(num_rows * avg_row_len /1024/1024, 8) as total_len,…