How does the query decide which Infoprovider to fetch data from

Hi,
Could somebody please explain what steps go on in background to enable the query to decide which Infoproviders it should fetch data from in a multiprovider.Assuming that in the multprovider we have some infocubes that are logically partitioned by Fiscal Year and other cubes that are not.
Thanks VK..

Does the RRKMULTIPROVHINT technique work in case of a multiprovider that is not homogenous... Also in case there are 5 infocubes, does the select query run on fact table of all infocubes or are select queries run initially on the dimension tables and based upon which infocube has the required data for the query the fact table is queried..
Thanks

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|   0 | SELECT STATEMENT      |         |      1 |        |      1 |00:00:02.31 |   68351 |
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Some Clarifications
=============
DELETE /*+ ROWID(I) */ FROM INTSFI I WHERE
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| Id | Operation                      | Name    | Starts | E-Rows | A-Rows |   A-Time   | Buffers | OMem | 1Mem | Used-Mem |
|   0 | DELETE STATEMENT               |         |      1 |        |      0 |00:00:05.94 |   53247 |    |          |          |
|   1 | DELETE                        | INTSFI |      1 |        |      0 |00:00:05.94 |   53247 |    |          |          |
|* 2 |   HASH JOIN SEMI               |         |      1 |   9226 |      7 |00:00:05.94 |   53180 |   783K|   783K| 471K (0)|
|   3 |    NESTED LOOPS                |         |      1 |   9226 |      7 |00:00:00.01 |      10 |    |          |          |
|* 4 |     TABLE ACCESS BY ROWID RANGE| INTSFI |      1 |   9226 |      7 |00:00:00.01 |       6 |    |          |          |
|* 5 |     INDEX UNIQUE SCAN          | PURMAR1 |      7 |      1 |      7 |00:00:00.01 |       4 |    |          |          |
|   6 |    INDEX FAST FULL SCAN        | INTSFI1 |      1 |     14M|   7543K|00:00:01.73 |   53170 |    |          |          |
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Plan hash value: 2031485112
| Id | Operation                      | Name    | Starts | E-Rows | A-Rows |   A-Time   | Buffers |
|   0 | DELETE STATEMENT               |         |      1 |        |      0 |00:00:00.01 |      94 |
|   1 | DELETE                        | INTSFI |      1 |        |      0 |00:00:00.01 |      94 |
|   2 |   NESTED LOOPS SEMI            |         |      1 |   9226 |      7 |00:00:00.01 |      27 |
|   3 |    NESTED LOOPS                |         |      1 |   9226 |      7 |00:00:00.01 |       9 |
|* 4 |     TABLE ACCESS BY ROWID RANGE| INTSFI |      1 |   9226 |      7 |00:00:00.01 |       5 |
|* 5 |     INDEX UNIQUE SCAN          | PURMAR1 |      7 |      1 |      7 |00:00:00.01 |       4 |
|* 6 |    INDEX RANGE SCAN            | INTSFI1 |      7 |     14M|      7 |00:00:00.01 |      18 |
Predicate Information (identified by operation id):
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       filter(NVL("S"."RGCID",(-1))=NVL("I"."RGCID",(-1)))the above post is from Ahmed AANGOUR
Case 1 - . If you check Plan hash value: 16772749938
=====
TABLE ACCESS BY ROWID RANGE| INTSFI For every row access from INTSFI - it fetches a record from INDEX UNIQUE SCAN | PURMAR1
If we check A-rows = 9226
9226 * 7 = 64582 request across the table - perhaps with hint of rowid it fetches exact rows from PURMAR1
in this case i think going for hash join with ordered hints (jonathan as you suggest go for leading hint's instead of ordered) - from INTSFI - PURMAR1 - instead of going for IN clause would get the rows that satifies the ("P"."NUPUR"=1 AND "I"."COMAR"="P"."COMAR")
|* 2 |   HASH JOIN SEMI               |         |      1 |   9226 |      7 |00:00:05.94 |   53180 |   783K|   783K| 471K (0)|
|   3 |    NESTED LOOPS                |         |      1 |   9226 |      7 |00:00:00.01 |      10 |    |          |          |
|* 4 |     TABLE ACCESS BY ROWID RANGE| INTSFI |      1 |   9226 |      7 |00:00:00.01 |       6 |    |          |          |
|* 5 |     INDEX UNIQUE SCAN          | PURMAR1 |      7 |      1 |      7 |00:00:00.01 |       4 |    |          |          |My understanding with above plan would change to
HASH JOIN
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INDEX UNIQUE SCAN | PURMAR1
HASH JOIN
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Which migt be feasible.
2 .
DELETE /*+ ROWID(I) */ FROM INTSFI I WHERE
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to go push_predicate hints - still doubt it.
Jonathan your comments are most valuable in the above two cases..
Looking forward to calrify my understanding with concepts of indexes for above test cases
- Pavan Kumar N

How does the query decide which Infoprovider to fetch data from

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