本文提供了一种查询Oracle数据库中表、索引及分区表所占用空间的方法。通过使用SQL语句，可以方便地获取到各个表、索引及分区表的具体占用情况。
select segment_name, sum(bytes)/1024/1024 Mbytese from user_segments group by segment_name;
1、表占用空间
select segment_name, sum(bytes)/1024/1024 Mbytese from user_segments where segment_type='TABLE' group by segment_name;
2、索引占用空间select segment_name ,sum(bytes)/1024/1024 from user_segments where segment_type ='INDEX' group by segment_name;
3、分区表TABLE PARTITION占用空间
select segment_name,sum(bytes)/1024/1024 Mbytes from user_segments where segment_type='TABLE PARTITION' group by segment_name;
1、表占用空间
select segment_name, sum(bytes)/1024/1024 Mbytese from user_segments where segment_type='TABLE' group by segment_name;
2、索引占用空间select segment_name ,sum(bytes)/1024/1024 from user_segments where segment_type ='INDEX' group by segment_name;
3、分区表TABLE PARTITION占用空间
select segment_name,sum(bytes)/1024/1024 Mbytes from user_segments where segment_type='TABLE PARTITION' group by segment_name;
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