在oracle裡面，由於lob欄位有獨立的lob segment來儲存，所以查詢需要DBA_SEGMENTS S, DBA_INDEXES  2張表結合才可查出結果。

以下是實驗SQL說明：

表名：GJ_NORM_POOL

表歸屬使用者名稱：ORACLE

SELECT  
 (SELECT NVL(SUM(S.BYTES),0)                                                                                               -- The Table Segment size  
  FROM DBA_SEGMENTS S  
  WHERE S.OWNER = UPPER('ORACLE') AND  
       (S.SEGMENT_NAME = UPPER('GJ_NORM_POOL'))) +  
 (SELECT NVL(SUM(S.BYTES),0)                                                                                               -- The Lob Segment Size  
  FROM DBA_SEGMENTS S, DBA_LOBS L  
  WHERE S.OWNER = UPPER('ORACLE') AND  
       (L.SEGMENT_NAME = S.SEGMENT_NAME AND L.TABLE_NAME = UPPER('GJ_NORM_POOL') AND L.OWNER = UPPER('ORACLE'))) +  
 (SELECT NVL(SUM(S.BYTES),0)                                                                                               -- The Lob Index size  
  FROM DBA_SEGMENTS S, DBA_INDEXES I  
  WHERE S.OWNER = UPPER('ORACLE') AND  
       (I.INDEX_NAME = S.SEGMENT_NAME AND I.TABLE_NAME = UPPER('GJ_NORM_POOL') AND INDEX_TYPE = 'CLOB' AND I.OWNER = UPPER('ORACLE')))  
  "TOTAL TABLE SIZE"  
FROM DUAL;  
 

select 13500416/1024/1024/1024 from dual;