How can i know if my query is using the index ?
Hello...
How can i know if my query is using the index of the table or not?
im using set autotrace on...but is there another way to do it?
thanks!
Alessandro Falanque.
Hi,
You can use Explain Plan for checking that your query is using proper index or not. First you need to check that Plan_table is installed in your database or not. If it is not there THEN THE SCRIPT WILL BE LIKE THIS:
CREATE TABLE PLAN_TABLE (
STATEMENT_ID VARCHAR2 (30),
TIMESTAMP DATE,
REMARKS VARCHAR2 (80),
OPERATION VARCHAR2 (30),
OPTIONS VARCHAR2 (30),
OBJECT_NODE VARCHAR2 (128),
OBJECT_OWNER VARCHAR2 (30),
OBJECT_NAME VARCHAR2 (30),
OBJECT_INSTANCE NUMBER,
OBJECT_TYPE VARCHAR2 (30),
OPTIMIZER VARCHAR2 (255),
SEARCH_COLUMNS NUMBER,
ID NUMBER,
PARENT_ID NUMBER,
POSITION NUMBER,
COST NUMBER,
CARDINALITY NUMBER,
BYTES NUMBER,
OTHER_TAG VARCHAR2 (255),
PARTITION_START VARCHAR2 (255),
PARTITION_STOP VARCHAR2 (255),
PARTITION_ID NUMBER,
OTHER LONG,
DISTRIBUTION VARCHAR2 (30))
TABLESPACE SYSTEM NOLOGGING
PCTFREE 10
PCTUSED 40
INITRANS 1
MAXTRANS 255
STORAGE (
INITIAL 10240
NEXT 10240
PCTINCREASE 50
MINEXTENTS 1
MAXEXTENTS 121
FREELISTS 1 FREELIST GROUPS 1 )
NOCACHE;
After that write the following command in the SQL prompt.
Explain plan for (Select statement);
Select level, SubStr( lpad(' ',2*(Level-1)) || operation || ' ' ||
object_name || ' ' || options || ' ' ||
decode(id, null , ' ', decode(position, null,' ', 'Cost = ' || position) ),1,100)
|| ' ' || nvl(other_tag, ' ') Operation
from PLAN_TABLE
start with id = 0
connect by
prior id = parent_id;
This will show how the query is getting executed . What are all the indexes it is using etc.
Cheers.
Samujjwal Basu
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Why is this query not using the index?
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SELECT CUST_PO_NUMBER, HEADER_ID, ORDER_TYPE, PO_DATE
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1
2 -------------------------------------------------------------------------------------
3 | Id | Operation | Name | Rows | Bytes | Cost (%CPU)|
4 -------------------------------------------------------------------------------------
5 | 0 | SELECT STATEMENT | | 2735K| 140M| 81036 (2)|
6 |* 1 | TABLE ACCESS FULL| TABLE1 | 2735K| 140M| 81036 (2)|
7 -------------------------------------------------------------------------------------
8
9 Predicate Information (identified by operation id):
10 ---------------------------------------------------
11
12 1 - filter("STATUS"='N')
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1 TABLE1_IDX2 NORMAL NONUNIQUE TABLE1 STATUS 1
2 TABLE1_IDX NORMAL NONUNIQUE TABLE1 HEADER_ID 1
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I've already tried using optimizer hints and regathering the stats on the table, but the execution plan still remains the same, i.e. it still uses a FTS.
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inspite of this, the query is still using a full table scan.
The table has around 55 Lakh records, across 60 columns. And because of the FTS, the query is taking a long time to execute. How do i make it use the index?
Please help.
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Query
SELECT case.case_objid FROM [email protected] case, table_x_cwp_tickect_details_vw t WHERE CASE.case_condition_cd IN ('OPEN', 'OPEN-DISPATCH', 'OPEN-REJECT', 'OPEN-RETURNED') AND case.case_type_cd in ('CUSTOMER FAULT', 'CHRONIC','SCHEDULED ACTIVITY','PROBLEM') AND ROWNUM <= 500 AND case.case_objid = t.ticket_objid AND ( ( case.account_id = '672286' ) ) ORDER BY case.case_id DESC
From PROD
Plan
SELECT STATEMENT HINT: FIRST_ROWS Cost: 2,629 Bytes: 221,500 Cardinality: 500
37 SORT ORDER BY Cost: 2,629 Bytes: 221,500 Cardinality: 500
36 COUNT STOPKEY
35 NESTED LOOPS OUTER Cost: 2,628 Bytes: 279,533 Cardinality: 631
33 HASH JOIN OUTER Cost: 2,627 Bytes: 275,116 Cardinality: 631
31 NESTED LOOPS OUTER Cost: 2,249 Bytes: 266,282 Cardinality: 631
28 NESTED LOOPS Cost: 1,766 Bytes: 257,448 Cardinality: 631
26 NESTED LOOPS Cost: 1,765 Bytes: 253,031 Cardinality: 631
24 NESTED LOOPS Cost: 1,764 Bytes: 248,614 Cardinality: 631
22 NESTED LOOPS Cost: 1,763 Bytes: 244,197 Cardinality: 631
19 NESTED LOOPS Cost: 1,258 Bytes: 235,363 Cardinality: 631
17 NESTED LOOPS Cost: 1,257 Bytes: 230,946 Cardinality: 631
14 NESTED LOOPS OUTER Cost: 752 Bytes: 217,695 Cardinality: 631
12 HASH JOIN Cost: 751 Bytes: 213,278 Cardinality: 631
1 INDEX FAST FULL SCAN INDEX (UNIQUE) SA.GBST_ELM_OBJINDEX Cost: 2 Bytes: 10,052 Cardinality: 1,436
11 HASH JOIN Cost: 748 Bytes: 208,861 Cardinality: 631
2 INDEX FAST FULL SCAN INDEX (UNIQUE) SA.GBST_ELM_OBJINDEX Cost: 2 Bytes: 10,052 Cardinality: 1,436
10 HASH JOIN Cost: 746 Bytes: 204,444 Cardinality: 631
3 INDEX FAST FULL SCAN INDEX (UNIQUE) SA.GBST_ELM_OBJINDEX Cost: 2 Bytes: 10,052 Cardinality: 1,436
9 HASH JOIN Cost: 743 Bytes: 200,027 Cardinality: 631
4 INDEX FAST FULL SCAN INDEX (UNIQUE) SA.GBST_ELM_OBJINDEX Cost: 2 Bytes: 10,052 Cardinality: 1,436
8 NESTED LOOPS Cost: 741 Bytes: 195,610 Cardinality: 631
5 REMOTE REMOTE CASE Cost: 235 Bytes: 156,488 Cardinality: 631
7 TABLE ACCESS BY INDEX ROWID TABLE SA.TABLE_CASE Cost: 1 Bytes: 62 Cardinality: 1
6 INDEX UNIQUE SCAN INDEX (UNIQUE) SA.TC_C_CASE_OBJINDEX Cost: 1 Cardinality: 1
13 INDEX UNIQUE SCAN INDEX (UNIQUE) SA.UN_PTT2CASE Cost: 1 Bytes: 7 Cardinality: 1
16 TABLE ACCESS BY INDEX ROWID TABLE SA.TABLE_SITE Cost: 1 Bytes: 21 Cardinality: 1
15 INDEX UNIQUE SCAN INDEX (UNIQUE) SA.SITE_OBJINDEX Cost: 1 Cardinality: 1
18 INDEX UNIQUE SCAN INDEX (UNIQUE) SA.BUS_ORG_OBJINDEX Cost: 1 Bytes: 7 Cardinality: 1
21 TABLE ACCESS BY INDEX ROWID TABLE SA.TABLE_ADDRESS Cost: 1 Bytes: 14 Cardinality: 1
20 INDEX UNIQUE SCAN INDEX (UNIQUE) SA.ADDRESS_OBJINDEX Cost: 1 Cardinality: 1
23 INDEX UNIQUE SCAN INDEX (UNIQUE) SA.COUNTRY_OBJINDEX Cost: 1 Bytes: 7 Cardinality: 1
25 INDEX UNIQUE SCAN INDEX (UNIQUE) SA.CONTACT_OBJINDEX Cost: 1 Bytes: 7 Cardinality: 1
27 INDEX UNIQUE SCAN INDEX (UNIQUE) SA.CONDITION_OBJINDEX Cost: 1 Bytes: 7 Cardinality: 1
30 TABLE ACCESS BY GLOBAL INDEX ROWID TABLE SA.TABLE_SITE_PART Cost: 1 Bytes: 14 Cardinality: 1 Partition #: 34
29 INDEX UNIQUE SCAN INDEX (UNIQUE) SA.SITE_PART_OBJINDEX Cost: 1 Cardinality: 1
bold 32 TABLE ACCESS FULL TABLE SA.TABLE_MOD_LEVEL Cost: 376 Bytes: 1,442,084 Cardinality: 103,006 bold
34 INDEX UNIQUE SCAN INDEX (UNIQUE) SA.PART_NUM_OBJINDEX Cost: 1 Bytes: 7 Cardinality: 1
From DEV platform
Plan
SELECT STATEMENT HINT: FIRST_ROWS Cost: 591 Bytes: 61,134 Cardinality: 138
37 SORT ORDER BY Cost: 591 Bytes: 61,134 Cardinality: 138
36 COUNT STOPKEY
35 HASH JOIN Cost: 590 Bytes: 61,134 Cardinality: 138
1 INDEX FAST FULL SCAN INDEX (UNIQUE) SA.GBST_ELM_OBJINDEX Cost: 2 Bytes: 10,045 Cardinality: 1,435
34 HASH JOIN Cost: 588 Bytes: 60,168 Cardinality: 138
2 INDEX FAST FULL SCAN INDEX (UNIQUE) SA.GBST_ELM_OBJINDEX Cost: 2 Bytes: 10,045 Cardinality: 1,435
33 HASH JOIN Cost: 585 Bytes: 59,202 Cardinality: 138
3 INDEX FAST FULL SCAN INDEX (UNIQUE) SA.GBST_ELM_OBJINDEX Cost: 2 Bytes: 10,045 Cardinality: 1,435
32 HASH JOIN Cost: 583 Bytes: 58,236 Cardinality: 138
4 INDEX FAST FULL SCAN INDEX (UNIQUE) SA.GBST_ELM_OBJINDEX Cost: 2 Bytes: 10,045 Cardinality: 1,435
31 NESTED LOOPS OUTER Cost: 580 Bytes: 57,270 Cardinality: 138
29 NESTED LOOPS OUTER Cost: 579 Bytes: 56,304 Cardinality: 138
27 NESTED LOOPS OUTER Cost: 469 Bytes: 54,372 Cardinality: 138
24 NESTED LOOPS Cost: 363 Bytes: 52,440 Cardinality: 138
22 NESTED LOOPS Cost: 362 Bytes: 51,474 Cardinality: 138
20 NESTED LOOPS Cost: 361 Bytes: 50,508 Cardinality: 138
18 NESTED LOOPS Cost: 360 Bytes: 49,542 Cardinality: 138
15 NESTED LOOPS Cost: 249 Bytes: 47,610 Cardinality: 138
13 NESTED LOOPS Cost: 248 Bytes: 46,644 Cardinality: 138
10 NESTED LOOPS OUTER Cost: 138 Bytes: 43,746 Cardinality: 138
8 NESTED LOOPS Cost: 137 Bytes: 42,780 Cardinality: 138
5 REMOTE REMOTE CASE Cost: 26 Bytes: 34,224 Cardinality: 138
7 TABLE ACCESS BY INDEX ROWID TABLE SA.TABLE_CASE Cost: 1 Bytes: 62 Cardinality: 1
6 INDEX UNIQUE SCAN INDEX (UNIQUE) SA.TC_C_CASE_OBJINDEX Cost: 1 Cardinality: 1
9 INDEX UNIQUE SCAN INDEX (UNIQUE) SA.UN_PTT2CASE Cost: 1 Bytes: 7 Cardinality: 1
12 TABLE ACCESS BY INDEX ROWID TABLE SA.TABLE_SITE Cost: 1 Bytes: 21 Cardinality: 1
11 INDEX UNIQUE SCAN INDEX (UNIQUE) SA.SITE_OBJINDEX Cost: 1 Cardinality: 1
14 INDEX UNIQUE SCAN INDEX (UNIQUE) SA.BUS_ORG_OBJINDEX Cost: 1 Bytes: 7 Cardinality: 1
17 TABLE ACCESS BY INDEX ROWID TABLE SA.TABLE_ADDRESS Cost: 1 Bytes: 14 Cardinality: 1
16 INDEX UNIQUE SCAN INDEX (UNIQUE) SA.ADDRESS_OBJINDEX Cost: 1 Cardinality: 1
19 INDEX UNIQUE SCAN INDEX (UNIQUE) SA.COUNTRY_OBJINDEX Cost: 1 Bytes: 7 Cardinality: 1
21 INDEX UNIQUE SCAN INDEX (UNIQUE) SA.CONTACT_OBJINDEX Cost: 1 Bytes: 7 Cardinality: 1
23 INDEX UNIQUE SCAN INDEX (UNIQUE) SA.CONDITION_OBJINDEX Cost: 1 Bytes: 7 Cardinality: 1
26 TABLE ACCESS BY GLOBAL INDEX ROWID TABLE SA.TABLE_SITE_PART Cost: 1 Bytes: 14 Cardinality: 1 Partition #: 34
25 INDEX UNIQUE SCAN INDEX (UNIQUE) SA.SITE_PART_OBJINDEX Cost: 1 Cardinality: 1
bold 28 INDEX RANGE SCAN INDEX SA.IND_PART_INFO2PART_NUM Cost: 1 Bytes: 14 Cardinality: 1 bold
30 INDEX UNIQUE SCAN INDEX (UNIQUE) SA.PART_NUM_OBJINDEX Cost: 1 Bytes: 7 Cardinality: 1
Conclusion:
IND_PART_INFO2PART_NUM is not in use in Production environment
PROD
1. SQL> select index_name,NUM_ROWS,CLUSTERING_FACTOR from dba_indexes where index_name='IND_PART_INFO2PART_NUM';
INDEX_NAME NUM_ROWS CLUSTERING_FACTOR
IND_PART_INFO2PART_NUM 103023 46488
DEV environment
SQL> select index_name,NUM_ROWS,CLUSTERING_FACTOR,table_name from dba_indexes where index_name='IND_PART_INFO2PART_NUM';
INDEX_NAME NUM_ROWS CLUSTERING_FACTOR TABLE_NAME
IND_PART_INFO2PART_NUM 101982 45722 TABLE_MOD_LEVEL
1. Index is rebuild
2. stats are up to date
3. Redef on table is done.
Still no change in the plan .Osama-mustafa wrote:
Aman.... wrote:
Osama-mustafa wrote:
alter index <index-name> rebuild ;Why?
Aman....I faced this issue with query and indexes was need rebuildWhat issue Osama-that query wasn't using index and after rebuild it did start using it? Not just that this reply is wrong , this is OP has mentioned that he has done already. Please note that index rebuild is not the answer when the query is not using the index. There can be many reasons behind it. Have a look at Richard Foote's blog where he explains all of this in a very detailed way and in many posts.
Aman.... -
How can I know, which RFC connection is used by my query designer ?
HI,
I would like to know,
which RFC connection is used when i launch the query designer or the report designer or the web designer.
Thanks.
GuillaumeHi,
Go to TCODE SM59 and see.
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