Why index is not used by this table

Dear all,
Currently I'm facing problem with tuning one sql statement.
It shows that full table scan in ZTLTBC_FILTER cost 15:19.
But in table ZTLTBC_FILTER, it have index with field
index 1    MANDT INT_NAME FNAME VALUE
index 2    MANDT EXEC_ID COUNTER
index 3    MANDT INT_NAME VALUE
the last statistic date for these index is three months before
Could you please help to find out the reason why index is not used? statistics are old or small distinct value for field INT_NAME?
How to solve this full table scan problem?
Thanks & Regards,
Chris
sql statement
SELECT T_00."MANDT",T_00."EXEC_ID",T_00."COUNTER",T_00."FNAME",T_00."INT_NAME",T_00."VALUE"
FROM "ZTLTBC_FILTER" T_00
WHERE T_00."MANDT"=:A0 AND T_00."INT_NAME"=:A1 AND EXISTS
(SELECT T_100."INT_NAME"
FROM "ZTLTBC_MIRR_BUFF" T_100
WHERE T_100."MANDT"=:A2 AND T_100."INT_NAME"=:A3 AND T_100."EXEC_ID"=T_00."EXEC_ID" AND
T_100."COUNTER"=T_00."COUNTER")
| Id | Operation            | Name               | Rows | Bytes |TempSpc| Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT     |                    |       |       |       |   176K(100)|          |
|* 1 | HASH JOIN RIGHT SEMI|                    | 9958K| 1111M|   598M|   176K (2)| 00:17:53 |
|* 2 |   INDEX RANGE SCAN   | ZTLTBC_MIRR_BUFF~0 | 9958K|   484M|       | 6265   (1)| 00:00:39 |
|* 3 |   TABLE ACCESS FULL | ZTLTBC_FILTER      |    13M|   822M|       |   150K (2)| 00:15:19 |
   1 - access("T_100"."EXEC_ID"="T_00"."EXEC_ID" AND "T_100"."COUNTER"="T_00"."COUNTER")
   2 - access("T_100"."MANDT"=:A2 AND "T_100"."INT_NAME"=:A3)
   3 - filter(("T_00"."INT_NAME"=:A1 AND "T_00"."MANDT"=:A0))

Hello Bret,
I'm using oracle 11.2
Thanks & Regards,
Chris

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Why index is not used if oracle have to do implicit conversion?

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the problem is that, when I use NUMBER as below, execution plan will not use bitmap indexes at all.
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Edited by: PhoenixBai on Jan 30, 2011 10:52 AM
Edited by: PhoenixBai on Jan 31, 2011 9:21 AM --added database version as 10gR2

sybrand_b wrote:
Implicit conversion in Oracle is always done like this
empno='10'
is rewritten as
to_char(empno)='10'
Now you have <function>(<indexed columnn>) = <hardcoded literal>
Oracle never puts a conversion function at the right hand side of the expresssion. NEVER.
SQL> create table emp as select * from scott.emp;
Table created.
SQL> alter table emp add constraint emp_pk primary key (empno);
Table altered.
SQL> @desc emp
Name                                      Null?    Type
EMPNO                                     NOT NULL NUMBER(4)
ENAME                                              VARCHAR2(10)
JOB                                                VARCHAR2(9)
MGR                                                NUMBER(4)
HIREDATE                                           DATE
SAL                                                NUMBER(7,2)
COMM                                               NUMBER(7,2)
DEPTNO                                             NUMBER(2)
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2
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Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Compatibility is set to 11.2.0.0.0
Plan hash value: 4024650034
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Predicate Information (identified by operation id):
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Index was not used in join tables query

I tested the following query on my dev 10g and the explain plan did not indicated to use the index of a(t$trec, t$tdoc)
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Because Oracle believes, for any number of possible reasons, that the use of the index would be less efficient.
Force the index usage with a hint and see how Oracle reacts or run a 10053 trace and see why Oracle is making the decision it is making.
Perhaps it is as impressed by a column holding a single space as a placeholder for null as I am. <g>

Index is not using for this query

I have this query and it doesn't use index. Can you put your suggestion please?
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/* cp */
bt.value value,
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user5797895 wrote:
Thanks for the update
1. I don't understand where to put {}. you meant in the forum page like below
Use the tag. Read the [FAQ|http://wiki.oracle.com/page/Oracle+Discussion+Forums+FAQ?t=anon] for more information. It's the link on the top right corner.
>
2. AROUND 8000 IN DEV MACHINE. BUT 1.5M IN PRODUCTION
It's a more or less useless exercise if you have that vast difference between the two systems. You need to test this thoroughly using a similar amount of data.
3.
Note: cpu costing is off, PLAN_TABLE' is old version
You need to re-create your PLAN_TABLE. That's the reason why important information is missing from your plans. It's the so called "Predicate Information" section below the execution plan and it requires the correct version of the plan table. Drop your current plan table and re-run in SQL*Plus on the server:
@?/rdbms/admin/utlxplan
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Dynamic sampling doesn't alter the plan in any way no matter what sampling level I choose.
When I added Cardinality it switched from 1 full table scan and 2 index read
Can you post the statements with the hints included resp. just the first line including the hints used for the different attempts?
# WITH dbms_stats.gather_table_stats, without cardinality it uses indexes all the time.
How did you call DBMS_STATS.GATHER_TABLE_STATS, i.e. which parameter values where you using?
# After deleting the table stats performance improved back
All these different attempts are not really helpful if you don't say which of them was more effective than the other ones. That's why I'm asking for the "Predicate Information" section so that this information can be used to determine which of your tables might benefit from an indexed access path and which don't.
As already mentioned several times if you use SQL tracing as described in one of the links provided you could see which operation produces how many rows. This would allow to determine if it is efficient or not.
But given that you're doing all this with your test data it doesn't say much about the performance in your production environment.
4. whether GTT created with "ON COMMIT PRESERVE ROWS"?
YES - BUT DIFFERENT SESSIONS HAS DIFFERENT NUMBER OF ROWS
The question is, whether the number of rows differs significantly, if yes, then you shouldn't use the DBMS_STATS approach
5. neigher (48 sec. / 25 sec. run time) are sufficient, then what is the expected?
ACTUALLY I AM DOING IT IN DEVELOPMENT MACHINVE. IN PRODUCTION THE NUMBER OF ROWS ARE DIFFERENT. LAST TIME WHEN WE RELEASED THE
PATCH WITH THIS CODE, THE PERFORMANCE WAS BAD.
See 2., you need to have a suitable test environment. It's a more or less useless exercise if you only have a fraction of the actual amount of data.
Regards,
Randolf
Oracle related stuff blog:
http://oracle-randolf.blogspot.com/
SQLTools++ for Oracle (Open source Oracle GUI for Windows):
http://www.sqltools-plusplus.org:7676/
http://sourceforge.net/projects/sqlt-pp/

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DBVersion: 10.2.0.3
CREATE TABLE "ESW"."DURCHLAUFZEIT_SONDER_AG"
   (     "AG" NUMBER(3,0) DEFAULT 0 NOT NULL ENABLE,
     "TAGE" NUMBER(5,0) DEFAULT 0 NOT NULL ENABLE,
     "ABTEILUNG" VARCHAR2(20 BYTE),
Content of this table
AG    TAGE ABTEILUNG
910     1     EAV
133     1     TG
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719     2     TM
706     2     TM
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and dsa.ag = apl.arbeitsgang_nr
GROUP BY w2.walzen_nr,
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|   0 | SELECT STATEMENT                |                                |    21 | 1155 | 4927 |
|   1 | SORT GROUP BY                  |                                |    21 | 1155 | 4927 |
|* 2 |   HASH JOIN                     |                                |    21 | 1155 | 4922 |
|   3 |    NESTED LOOPS                 |                                |   333 | 11655 | 4682 |
|   4 |     NESTED LOOPS                |                                | 16215 |   427K| 4682 |
|   5 |      TABLE ACCESS BY INDEX ROWID| DURCHLAUFZEIT_SONDER_AG        |     4 |    40 |     2 |
|* 6 |       INDEX RANGE SCAN          | DURCHLAUFZEIT_SONDER_AG_INDEX1 |     4 |       |     1 |
|   7 |      TABLE ACCESS BY INDEX ROWID| AUFTRAG_ARBEITSPLAN            | 4054 | 68918 | 1170 |
|* 8 |       INDEX RANGE SCAN          | AUFTRAG_ARBEITSPLAN_IND3       | 4054 |       |     7 |
|* 9 |     INDEX RANGE SCAN            | DURCHLAUFZEIT_SONDER_AG_INDEX2 |     1 |     8 |       |
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and apl.auftr_los = w2.auftr_los
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|   1 | SORT GROUP BY                   |                                |     2 |    94 | 1161 |
|   2 |   TABLE ACCESS BY INDEX ROWID    | WALZE                          |     1 |    20 |     2 |
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|* 10 |        INDEX RANGE SCAN          | AUFTRAG_ARBEITSPLAN_IND3       | 2276 |       |     8 |
|* 11 |     INDEX RANGE SCAN             | WALZE_IND1                     |     1 |       |     1 |
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So these would be valid (provided hint_one is correctly specified)...
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I just saw your IP design and from this I can see that you have message mapping between Sender(as in Outbound interface MIOASY) and abstract interface (as in MIAASY) and then in that you have used transformation step to utilise Interface mapping which is between same abstract interface which is not required at all as message type for both the interfaces is same. For me, what your configuration would be is
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2. Receiver Determination with Sender and sender interface as MIOASY while receiver as IP(Integration process)
3. Interface determination between
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rec Abstract Interface MIAASY_Sen
send Abstract Interface MIAASY_Rec
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2. Receiver Determination with Sender and sender interface as MIOASY while receiver as IP(Integration process)
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Let me know if it works.
Regards,
Amit

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