How to change the order for table?

I use oracle 10g 10.2.0.3.0

I have a select statement
SELECT /*+ leading v.Guest_Info v.Guest_Domain_Relation Guest_Address*/
*
  FROM (SELECT 
         Cdr.Guest_Domain_Relation_Id,
         Ci.Guest_Id        
          FROM Guest_Info         Ci,
               Guest_Domain_Relation Cdr
         WHERE Ci.Guest_Id = Cdr.Guest_Id) v,
       Guest_Address Ca
 WHERE v.Guest_Id = Ca.Guest_Id;
and explain the Plan shows
1     Plan hash value: 3785964411
2      
3     ---------------------------------------------------------------------------------------------------------
4     | Id  | Operation                     | Name                    | Rows  | Bytes | Cost (%CPU)| Time     |
5     ---------------------------------------------------------------------------------------------------------
6     |   0 | SELECT STATEMENT              |                         |  1806 |   199K|     9  (23)| 00:00:01 |
7     |*  1 |  HASH JOIN                    |                         |  1806 |   199K|     9  (23)| 00:00:01 |
8     |   2 |   MERGE JOIN                  |                         |   482 | 48682 |     6  (17)| 00:00:01 |
9     |   3 |    TABLE ACCESS BY INDEX ROWID| Guest_ADDRESS          |   919 | 87305 |     4   (0)| 00:00:01 |
10     |   4 |     INDEX FULL SCAN           | XAK1Guest_ADDRESS      |   919 |       |     1   (0)| 00:00:01 |
11     |*  5 |    SORT JOIN                  |                         |   482 |  2892 |     2  (50)| 00:00:01 |
12     |   6 |     INDEX FULL SCAN           | XPKGuest_INFO          |   482 |  2892 |     1   (0)| 00:00:01 |
13     |   7 |   VIEW                        | index$_join$_003        |  3493 | 41916 |     3   (0)| 00:00:01 |
14     |*  8 |    HASH JOIN                  |                         |       |       |            |          |
15     |   9 |     INDEX FAST FULL SCAN      | XAK1Guest_DOMAIN_Relation |  3493 | 41916 |     1   (0)| 00:00:01 |
16     |  10 |     INDEX FAST FULL SCAN      | XPKGuest_DOMAIN_Relation  |  3493 | 41916 |     1   (0)| 00:00:01 |
17     ---------------------------------------------------------------------------------------------------------
18      
19     Predicate Information (identified by operation id):
20     ---------------------------------------------------
21     
Is there in any case, I have Guess_Domain_Relation table join firstly that the join to Guess_Address table of Guest_info?

I tried a few ways to rewrite the query, but he's no luck

Thank you

Published by: Y.L on March 20, 2013 13:59

Y.L wrote:
And my another problem here... I don't know why my first clue didn't work...

Probably the syntax. The main indicator uses parentheses, as

/*+
select /*+ leading(table1, table2) */ *
  from table1, table2
*/

Remember that you must use the table alias name in tips for the identifier to be recognized

You can also consider using the y indicator (if you must use a hint) for several tables - beware, it is MUCH easier to do worse performance with this suspicion using the order of the tables in the FROM clause in left to right

/*+
select /*+  ordered */ *
  from table1, table2, table3
. . .
*/

How I create index will affect how it works?

How the index was created probably won't affect how it works. Indexes can be created using constraints and directly with the CREATE INDEX command. The creation of the index should not be as important as its defined characteristics: index type, columns, etc.

Tags: Database

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