Do not adjust despite the advice of the index

Its Oracle 10g Release 10.2.0.4.0

Hi all

I have this query in which there are indexes on the instrument table like this:

Instrument:
idx 1 : (INSTRUMENT_ID, END_COB_DATE, CLOSE_ACTION_ID, PRODUCT_SUB_TYPE_ID, BEGIN_COB_DATE)
idx 2 : ( INSTRUMENT_ID, INSTRUMENT_VN, END_COB_DATE, CLOSE_ACTION_ID)
idx 3 : (CLOSE_ACTION_ID, END_COB_DATE)

I tried all possible ways, but none of the indices are used to causing complete this table table scans. I need advice on how can I avoid this FTS, so the query can run fast and use the index on the table of the Instrument:

query:

select distinct i.instrument_id,
                i.name,
                case
                  when (mn2.display_name != 'DEBT PRIORITY CLASS' and
                       mn2.display_name is not null) then
                   mn2.display_name
                  else
                   mn1.display_name
                end "DEBT_PRIORITY_CLASS"
  from instrument i, inst_debt id
  left join marsnode mn1 on (id.debt_priority_class_id = mn1.node_id and
                            mn1.close_date is null and
                            mn1.type_id = 58412926883279)
  left join marsnodelink mnl1 on (mn1.node_id = mnl1.node_id and
                                 mnl1.close_date is null and
                                 mnl1.begin_cob_date <=
                                 TO_DATE('27-Oct-2010', 'DD-Mon-YYYY') and
                                 mnl1.end_cob_date >
                                 TO_DATE('27-Oct-2010', 'DD-Mon-YYYY'))
  left join marsnode mn2 on (mnl1.parent_id = mn2.node_id and
                            mn2.close_date is null and
                            mn2.type_id = 58412926883279)
 where i.instrument_id = id.instrument_id
   and i.instrument_vn = id.instrument_vn
   AND i.end_cob_date > TO_DATE('27-Oct-2010', 'DD-Mon-YYYY')
   AND i.close_action_id is null
   AND i.product_sub_type_id = 3
   AND i.begin_cob_date <= TO_DATE('27-Oct-2010', 'DD-Mon-YYYY')

It is the execution plan

--------------------------------------------------------------------------------------------------
| Id  | Operation                       | Name              | Rows  | Bytes |TempSpc| Cost (%CPU)|
--------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT                |                   |  2026K|   407M|       |   509K (20)|
|   1 |  HASH UNIQUE                    |                   |  2026K|   407M|   879M|   509K (20)|
|*  2 |   HASH JOIN RIGHT OUTER         |                   |  2026K|   407M|       |   426K (23)|
|*  3 |    TABLE ACCESS BY INDEX ROWID  | MARSNODE          |   501 | 23046 |       |   239   (3)|
|*  4 |     INDEX RANGE SCAN            | FKI_38576_TYPE_ID | 10159 |       |       |    34   (6)|
|*  5 |    HASH JOIN RIGHT OUTER        |                   |  2026K|   318M|       |   425K (23)|
|*  6 |     TABLE ACCESS FULL           | MARSNODELINK      |   330 | 15510 |       |  6560  (16)|
|*  7 |     HASH JOIN RIGHT OUTER       |                   |  2026K|   228M|       |   419K (23)|
|*  8 |      TABLE ACCESS BY INDEX ROWID| MARSNODE          |   501 | 23046 |       |   239   (3)|
|*  9 |       INDEX RANGE SCAN          | FKI_38576_TYPE_ID | 10159 |       |       |    34   (6)|
|* 10 |      HASH JOIN                  |                   |  2026K|   139M|    34M|   418K (23)|
|  11 |       TABLE ACCESS FULL         | INST_DEBT         |  1031K|    22M|       |  1665  (30)|
*|* 12 |       TABLE ACCESS FULL         | INSTRUMENT        |  2062K|    96M|       |   413K (23)|*
--------------------------------------------------------------------------------------------------

predicate info

 2 - access("MNL1"."PARENT_ID"="MN2"."NODE_ID"(+))
 3 - filter("MN2"."CLOSE_DATE"(+) IS NULL)
 4 - access("MN2"."TYPE_ID"(+)=58412926883279)
 5 - access("MN1"."NODE_ID"="MNL1"."NODE_ID"(+))
 6 - filter("MNL1"."CLOSE_DATE"(+) IS NULL AND "MNL1"."END_COB_DATE"(+)>TO_DATE('
            2010-10-27 00:00:00', 'syyyy-mm-dd hh24:mi:ss') AND "MNL1"."BEGIN_COB_DATE"(+)<=TO_DATE('
            2010-10-27 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))
 7 - access("ID"."DEBT_PRIORITY_CLASS_ID"="MN1"."NODE_ID"(+))
 8 - filter("MN1"."CLOSE_DATE"(+) IS NULL)
 9 - access("MN1"."TYPE_ID"(+)=58412926883279)
10 - access("I"."INSTRUMENT_ID"="ID"."INSTRUMENT_ID" AND
            "I"."INSTRUMENT_VN"="ID"."INSTRUMENT_VN")
12 - filter("I"."PRODUCT_SUB_TYPE_ID"=3 AND "I"."CLOSE_ACTION_ID" IS NULL AND
            "I"."END_COB_DATE">TO_DATE(' 2010-10-27 00:00:00', 'syyyy-mm-dd hh24:mi:ss') AND
            "I"."BEGIN_COB_DATE"<=TO_DATE(' 2010-10-27 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))

Kind regards
Aashish

Aashish S. wrote:
I tried all the possible ways but none of the indexes are getting used causing full table scans of this table. I need some guidance on how can I avoid this FTS so the query can run fast and use the index on Instrument table:
I guess that the last part of the statement above is what you really need reach (i.e. improve the execution time of the query) and the query not using index is what you think as the 'cause' for the real "problem". I will try to answer the real 'problem '. Based on what you've posted, some comments/suggestions
(1) your plan shows that the query should recover 2026 K lines. Are you sure you want to recover as many files? You can come back here on the "requirement".
(2) continuous superior point-to-point, you can view the details of how long takes the query to run to the present and how long do you expect to take. Another of the most important details will be how will you measure the runtime of the query. With this large number of records, it is quite possible that more time is spent by simply transferring the results of the query to the 'client' that the actual time taken by server to run the query.
(3) if what you posted is the order of the columns in the index on the table with INSTRUMENTS, then what evidence do will help you to run the query and how? The order of the columns indicate that none of the clues will be good enough and that seems to be the right choice.
(4) your section descriptor States that filter the predicate on table to INSTRUMENTS generates 2062 K lines. The number of records exist in the table of the INSTRUMENT? You will need to have a record much more (not to mention other factors like the order of data in the table etc.) in the table to justify the indexed access to pick up these huge number of lines.
(5) Finally, you can check if the tables and indexes used by the query statistics are up to date.

I hope this helps.

Tags: Database

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