Query rewrite don't work wor aggregate query but work for join query

Dear experts,
Let me know what's wrong for
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
I have two MATERIALIZED VIEW:
A) -- Only join
CREATE MATERIALIZED VIEW "SCOTT"."TST_MV"
ENABLE QUERY REWRITE AS
SELECT "T57410"."MEMBER_KEY" "MEMBER_KEY",
"T57410"."ANCESTOR_KEY" "ANCESTOR_KEY",
"T57410"."DISTANCE" "DISTANCE",
"T57410"."IS_LEAF" "IS_LEAF",
"T57460"."DEPARTMENTID" "DEPARTMENTID",
"T57460"."NAME" "NAME","T57460"."PARENT"
"PARENT","T57460"."SHORTNAME" "SHORTNAME",
"T57460"."SKIMOID" "SKIMOID"
FROM "BI_OIV_HIER" "T57410",
"BI_DEPARTMENTS" "T57460"
WHERE "T57410"."ANCESTOR_KEY"="T57460"."DEPARTMENTID";
B) -- Join with aggregation
CREATE MATERIALIZED VIEW "SCOTT"."TST_MV2"
("C41", "C42", "C43",
"C44", "C45", "C46",
"C47", "C48", "C49",
"C50", "C51", "C52",
"C53", "C54", "C55",
"C56", "C57", "C58",
"C59", "C60", "C61",
"INCIDENTTYPE")
ENABLE QUERY REWRITE
AS SELECT COUNT(T56454.TOTAL) AS c41,
T56840.CATEGORYID AS c42,
T56840.PARENT AS c43,
T56908.DOCSTATEID AS c44,
T56908.PARENT AS c45,
T56947.EXPIREDID AS c46,
T56947.PARENT AS c47,
T56986.ISSUESTATEID AS c48,
T56986.PARENT AS c49,
T57025.LOCATIONID AS c50,
T57025.PARENT AS c51,
T57064.NEWID AS c52,
T57064.PARENT AS c53,
T57103.PARENT AS c54,
T57103.RESOLUTIONID AS c55,
T57142.PARENT AS c56,
T57142.RESPONSIBLEID AS c57,
T57181.PARENT AS c58,
T57181.SOURCEID AS c59,
T57460.DEPARTMENTID AS c60,
T57460.PARENT AS c61,
T56454.INCIDENTTYPE
FROM BI_OIV_HIER T57410
BI_DEPARTMENTS T57460
BI_SOURCE_HIER T57176
SOURCE T57181
BI_RESPONSIBLE_HIER T57137
RESPONSIBLE T57142
BI_RESOLUTIONS_HIER T57098
RESOLUTIONS T57103
BI_NEW_HIER T57059
NEW T57064
BI_LOCATIONS_HIER T57020
LOCATIONS T57025
BI_ISSUESTATES_HIER T56981
ISSUESTATES T56986
BI_EXPIRED_HIER T56942
EXPIRED T56947
BI_DOCSTATES_HIER T56903
DOCSTATES T56908
BI_CATEGORY_HIER T56835
CATEGORY T56840
INCIDENTS T56454
WHERE ( T56454.RESOLUTION = T57098.MEMBER_KEY
AND T56454.CATEGORY = T56835.MEMBER_KEY
AND T56454.DOCSTATE = T56903.MEMBER_KEY
AND T56454.EXPIRED = T56942.MEMBER_KEY
AND T56454.ISSUESTATE = T56981.MEMBER_KEY
AND T56454.LOCATION = T57020.MEMBER_KEY
AND T56454.NEW = T57059.MEMBER_KEY
AND T56454.RESPONSIBLE = T57137.MEMBER_KEY
AND T56454.SOURCE = T57176.MEMBER_KEY
AND T56454.DEPARTMENTID = T57410.MEMBER_KEY
AND T56835.ANCESTOR_KEY = T56840.CATEGORYID
AND T56903.ANCESTOR_KEY = T56908.DOCSTATEID
AND T56942.ANCESTOR_KEY = T56947.EXPIREDID
AND T56981.ANCESTOR_KEY = T56986.ISSUESTATEID
AND T57020.ANCESTOR_KEY = T57025.LOCATIONID
AND T57059.ANCESTOR_KEY = T57064.NEWID
AND T57098.ANCESTOR_KEY = T57103.RESOLUTIONID
AND T57137.ANCESTOR_KEY = T57142.RESPONSIBLEID
AND T57176.ANCESTOR_KEY = T57181.SOURCEID
AND T57410.ANCESTOR_KEY = T57460.DEPARTMENTID
GROUP BY T56840.CATEGORYID,
T56840.PARENT,
T56908.DOCSTATEID,
T56908.PARENT,
T56947.EXPIREDID,
T56947.PARENT,
T56986.ISSUESTATEID,
T56986.PARENT,
T57025.LOCATIONID,
T57025.PARENT,
T57064.NEWID,
T57064.PARENT,
T57103.PARENT,
T57103.RESOLUTIONID,
T57142.PARENT,
T57142.RESPONSIBLEID,
T57181.PARENT,
T57181.SOURCEID,
T57460.DEPARTMENTID,
T57460.PARENT,
T56454.INCIDENTTYPE;
So, optimizer uses query rewrite in
select * from TST_MV
and don't use query rewrite in
select * from TST_MV2
within one session.
select * from TST_MV should be read as underlying select for TST_MV:
SELECT "T57410"."MEMBER_KEY" "MEMBER_KEY",
"T57410"."ANCESTOR_KEY" "ANCESTOR_KEY",
"T57410"."DISTANCE" "DISTANCE",
"T57410"."IS_LEAF" "IS_LEAF",
"T57460"."DEPARTMENTID" "DEPARTMENTID",
"T57460"."NAME" "NAME","T57460"."PARENT"
"PARENT","T57460"."SHORTNAME" "SHORTNAME",
"T57460"."SKIMOID" "SKIMOID"
FROM "BI_OIV_HIER" "T57410",
"BI_DEPARTMENTS" "T57460"
WHERE "T57410"."ANCESTOR_KEY"="T57460"."DEPARTMENTID";
So, select * from TST_MV2 should be read by similar way as underlying select to TST_MV2
DBMS_STATS.GATHER_TABLE_STAT is done for each table and MV.
Please help to investigate the issue.
Why TST_MV2 don't used for query rewrite ?
Kind regards.

Hi Carlos
It looks like you have more than one question in your posting. Would I be right in saying that you have an issue with how long Discoverer takes when compared with SQL, and a second issue with regards to MVs not being used? I will add some comments on both. If one of these is not an issue please inform.
Issue 1:
Have you compared the explain plan from Discoverer with SQL? You may need to use a tool like TOAD to see it.
Also, is Discoverer doing anything complicated with the data after it comes back? By complicated I mean do you have a large number of Page Items and / or Group Sorted items? SQL wouldn't have this overhead you see.
Because SQL would create a table, have you tried creating a table in Discoverer and seeing how long it takes?
Finally, what version of the database are you using?
Issue 2:
Your initial statement was that query rewrite works with several MV but not with others, yet in the body of the report you only show explain plans that do use the MV. Could you therefore go into some more detail regarding this situation.
Best wishes
Michael

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Query rewrite don't work wor aggregate query but work for join query

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