SQL Sample:

SELECT segment_name
    ,sum(siz_M) AS siz_M
FROM (
    SELECT segment_name
        ,segment_type
        ,bytes / 1024 / 1024 AS siz_M
    FROM user_segments
    WHERE segment_type LIKE 'TABLE%'
        AND segment_name = 'TABLE_NAME' --表名
    )
GROUP BY segment_name