查询Oracle 数据库中带有lob字段的某一个表的大小

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。

1. SELECT
2. (SELECT NVL(SUM(S.BYTES),0) -- The Table Segment size
3. FROM DBA_SEGMENTS S
4. WHERE S.OWNER = UPPER('LC0019999') AND
5. (S.SEGMENT_NAME = UPPER('ZWPZK'))) +
6. (SELECT NVL(SUM(S.BYTES),0) -- The Lob Segment Size
7. FROM DBA_SEGMENTS S, DBA_LOBS L
8. WHERE S.OWNER = UPPER('LC0019999') AND
9. (L.SEGMENT_NAME = S.SEGMENT_NAME AND L.TABLE_NAME = UPPER('ZWPZK') AND L.OWNER = UPPER('LC0019999'))) +
10. (SELECT NVL(SUM(S.BYTES),0) -- The Lob Index size
11. FROM DBA_SEGMENTS S, DBA_INDEXES I
12. WHERE S.OWNER = UPPER('LC0019999') AND
13. (I.INDEX_NAME = S.SEGMENT_NAME AND I.TABLE_NAME = UPPER('ZWPZK') AND INDEX_TYPE = 'LOB' AND I.OWNER = UPPER('LC0019999')))
14. "TOTAL TABLE SIZE"
15. FROM DUAL;
17. TOTAL TABLE SIZE
18. ----------------
19. 3571869286
20. SQL> select 3571869286/1024/1024/1024 from dual;
21. 35718692864/1024/1024/1024
22. --------------------------
23. 3.3265625