--SYSDBA为模式名,SLI_TEST为表名,查出来的单位为k

SELECT TABLE_USED_SPACE('SYSDBA', 'SLI_TEST')*(PAGE/1024) FROM DUAL

--下面这个语句也可以,和oracle用法类似

select segment_name,sum(bytes/1024) from user_segments where segment_name='SLI_TEST'