注意：由于lob字段有独立的lob segment来存储，故对于带有lob字段的表，不能仅仅查询dba_segments.
以下脚本来自：
How to Compute the Size of a Table containing Outline CLOBs and BLOBs[Article ID 118531.1]
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经过修改:改为了NVL(SUM(S.BYTES),0)
SQL> col "TOTAL TABLE SIZE" format 99999999999999
---注意：以下sql可以直接执行。为了方便复制该脚本，因此不贴SQL语句的log，而是放上了执行时的SQL语句。
SELECT
(SELECT NVL(SUM(S.BYTES),0) -- The Table Segment size
FROM DBA_SEGMENTS S
WHERE S.OWNER = UPPER('LC0019999') AND
(S.SEGMENT_NAME = UPPER('ZWPZK'))) +
(SELECT NVL(SUM(S.BYTES),0) -- The Lob Segment Size
FROM DBA_SEGMENTS S, DBA_LOBS L
WHERE S.OWNER = UPPER('LC0019999') AND
(L.SEGMENT_NAME = S.SEGMENT_NAME AND L.TABLE_NAME = UPPER('ZWPZK') AND L.OWNER = UPPER('LC0019999'))) +
(SELECT NVL(SUM(S.BYTES),0) -- The Lob Index size
FROM DBA_SEGMENTS S, DBA_INDEXES I
WHERE S.OWNER = UPPER('LC0019999') AND
(I.INDEX_NAME = S.SEGMENT_NAME AND I.TABLE_NAME = UPPER('ZWPZK') AND INDEX_TYPE = 'LOB' AND I.OWNER = UPPER('LC0019999')))
"TOTAL TABLE SIZE"
FROM DUAL;
TOTAL TABLE SIZE
----------------
3571869286
SQL> select 3571869286/1024/1024/1024 from dual;
35718692864/1024/1024/1024
--------------------------
3.3265625
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