DBMS_METADATA Dependent Object name filters

Question

Hello "Every One",
I'm having trouble using the BASE_OBJECT_NAME filter to extract metadata for dependent objects.
Never mind, I was having trouble doing this. However, I still have a question. Why am can I extract metadata for dependent objects using a filter combination of SCHEMA and BASE_OBEJCT_NAME_EXPR, or BASE_OBJECT_SCHEMA and BASE_OBJECT_NAME, but not SCHEMA and BASE_OBJECT_NAME?
I've included an example below which attempts to extract constraints on a specific table using the filters mentioned above.
SQL> DECLARE
  2    h NUMBER;
  3    th NUMBER;
  4    ddl CLOB;
  5  BEGIN
  6    FOR i IN 1..105 LOOP
  7      DBMS_OUTPUT.PUT('-');
  8    END LOOP;
  9    DBMS_OUTPUT.PUT_LINE('-');
10
11    h := DBMS_METADATA.OPEN('CONSTRAINT');
12    DBMS_METADATA.SET_FILTER(h, 'SCHEMA', 'LAB315JUNE06');
13    DBMS_METADATA.SET_FILTER(h, 'BASE_OBJECT_NAME', 'XCASE');
14    th := DBMS_METADATA.ADD_TRANSFORM(h, 'DDL');
15    DBMS_METADATA.SET_TRANSFORM_PARAM(th, 'SEGMENT_ATTRIBUTES', false);
16    LOOP
17      ddl := DBMS_METADATA.FETCH_CLOB(h);
18      EXIT WHEN ddl IS NULL;
19      DBMS_OUTPUT.PUT_LINE(ddl);
20    END LOOP;
21    DBMS_METADATA.CLOSE(h);
22
23    FOR i IN 1..105 LOOP
24      DBMS_OUTPUT.PUT('-');
25    END LOOP;
26    DBMS_OUTPUT.PUT_LINE('-');
27
28    h := DBMS_METADATA.OPEN('CONSTRAINT');
29    DBMS_METADATA.SET_FILTER(h, 'SCHEMA', 'LAB315JUNE06');
30    DBMS_METADATA.SET_FILTER(h, 'BASE_OBJECT_NAME_EXPR', 'IN (''XCASE'')');
31    th := DBMS_METADATA.ADD_TRANSFORM(h, 'DDL');
32    DBMS_METADATA.SET_TRANSFORM_PARAM(th, 'SEGMENT_ATTRIBUTES', false);
33    LOOP
34      ddl := DBMS_METADATA.FETCH_CLOB(h);
35      EXIT WHEN ddl IS NULL;
36      DBMS_OUTPUT.PUT_LINE(ddl);
37    END LOOP;
38    DBMS_METADATA.CLOSE(h);
39
40    FOR i IN 1..105 LOOP
41      DBMS_OUTPUT.PUT('-');
42    END LOOP;
43    DBMS_OUTPUT.PUT_LINE('-');
44
45    h := DBMS_METADATA.OPEN('CONSTRAINT');
46    DBMS_METADATA.SET_FILTER(h, 'BASE_OBJECT_SCHEMA', 'LAB315JUNE06');
47    DBMS_METADATA.SET_FILTER(h, 'BASE_OBJECT_NAME', 'XCASE');
48    th := DBMS_METADATA.ADD_TRANSFORM(h, 'DDL');
49    DBMS_METADATA.SET_TRANSFORM_PARAM(th, 'SEGMENT_ATTRIBUTES', false);
50    LOOP
51      ddl := DBMS_METADATA.FETCH_CLOB(h);
52      EXIT WHEN ddl IS NULL;
53      DBMS_OUTPUT.PUT_LINE(ddl);
54    END LOOP;
55    DBMS_METADATA.CLOSE(h);
56
57    FOR i IN 1..105 LOOP
58      DBMS_OUTPUT.PUT('-');
59    END LOOP;
60    DBMS_OUTPUT.PUT_LINE('-');
61  END;
62  /
  ALTER TABLE "LAB315JUNE06"."XCASE" ADD CONSTRAINT "XCASE_PK" PRIMARY KEY ("USPECID", "REL_INDEX") ENABLE
  ALTER TABLE "LAB315JUNE06"."XCASE" ADD CONSTRAINT "XCASE_PK" PRIMARY KEY ("USPECID", "REL_INDEX") ENABLE
PL/SQL procedure successfully completed.
SQL>Message was edited by:
Will Krause

Answer 1

If you ask questions related to dbms_metadata, it would add value if you provide your database version ( because there are a lot differences even between patchsets).
If you put dbms_metadata.get_query() calls in your block, you would see, which calls are made to the database. I did it ( as user sys and on my development schema/tables, so in your case the names may vary, but the point remains) - this is what i got for 1st rsp. 2nd call:
SELECT /*+rule*/ SYS_XMLGEN(VALUE(KU$), XMLFORMAT.createFormat2('CONSTRAINT_T', '7')), 0
FROM SYS.KU$_CONSTRAINT_VIEW KU$ WHERE NOT BITAND(KU$.BASE_OBJ.FLAGS,128)!=0
AND  KU$.OWNER_NAME=:SCHEMA1 AND   KU$.BASE_OBJ.NAME='CUSTOMER' AND   KU$.BASE_OBJ.OWNER_NAME='SYS';
SELECT /*+rule*/ SYS_XMLGEN(VALUE(KU$), XMLFORMAT.createFormat2('CONSTRAINT_T', '7')), 0
FROM SYS.KU$_CONSTRAINT_VIEW KU$ WHERE NOT BITAND(KU$.BASE_OBJ.FLAGS,128)!=0
AND  KU$.OWNER_NAME=:SCHEMA1 AND   KU$.BASE_OBJ.NAME IN ('CUSTOMER');
----------------------------------------------------------------------------------------------------------You see, in the first call a condition is added ( ku$.base_obj.owner_name='SYS' - block was executed under sys) , which is most likely wrong, that's why nothing is returned - so, probably this is a bug (at least, this condition don't make sense for me) and you may wish to fill an SR by Oracle Support.
Best regards
Maxim