ORACLE DBA_OBJECTS视图中OBJECT_TYPE为LOB的对象查看

在ORACLE数据库中，DBA_OBJECTS视图中OBJECT_TYPE为LOB的对象是什么东西呢？其实OBJECT_TYPE为LOB就是大对象（LOB），它指那些用来存储大量数据的数据库字段。下面演示一下:

CREATE TABLE TEST

(    

    "ID"   NUMBER, 

    "NAME" NVARCHAR2(10), 

    "TEST" CLOB

) 

INSERT INTO TEST

SELECT 1000, 'kerry', 'ttdfdf' FROM DUAL;

COMMIT;

SELECT * FROM DBA_LOBS WHERE OWNER='SYSTEM' AND TABLE_NAME='TEST'

SELECT * FROM DBA_OBJECTS

WHERE OBJECT_TYPE ='LOB'

AND OWNER         ='SYSTEM'

AND OBJECT_NAME='SYS_LOB0000585336C00003$$';

如果你想知道这些LOB对象涉及那些对象，可以使用下面SQL查看详细信息：

SELECT O.OWNER,O.OBJECT_ID,  O.OBJECT_NAME, O.OBJECT_TYPE,

       L.TABLE_NAME, L.COLUMN_NAME

FROM DBA_OBJECTS O

INNER JOIN DBA_LOBS L ON L.SEGMENT_NAME=O.OBJECT_NAME AND O.OWNER =L.OWNER

ORDER BY 1