Tuning : Inconsistent result between Explain plan VS Execution Time
Dear Experts,
Need your suggestions belongs to contrary result between Explain plan VS Execution Time
Environment :_
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit
PL/SQL Release 10.2.0.4.0 - Production
CORE 10.2.0.4.0 Production
TNS for Linux: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production
Red Hat Enterprise Linux 5.4
There's same query but : 1st query access Loan_Account, 2nd query access Loan_Account_Han
*1st.*
Query Access Via : Loan_account (Partition Type : Hash (5) with column Contract_Number)
Explain Plan : cost: 4,432, bytes: 716, cardinality: 2
Execution Time : 13 seconds
*2nd.*
Query Access Via : Loan_Account_Han (Partition Type : List(5) with column Loan_Status)
Explain Plan : cost:188,447 bytes: 1,661,088, cardinality: 4,719
Execution Time : 10 seconds
Note :_
all tables and all indexes belong to the table which included in query has been analyzed.
my question :
1. why it could become like this ? I even confusing with Jonathan Lewis Theory : Cost-Based Fundamental Book.
with this result, I even not believed with the result from Explain Plan anymore.
2. If analyze tables and indexes to update statistics which help CBO to choose the best path as part of Daily Performance Tuning,
is there a way that could do in enviroment 24x7 ?
Note : if original query is needed, I'll posting it here.
Any help is very appreciated and thanks very much.
Regards,
Sigcle
The DBMS_XPLAN.DISPLAY_CURSOR output
Query no 1
PLAN_TABLE_OUTPUT
SQL_ID bq7avs72xvmkv, child number 0
SELECT /*+ gather_plan_statistics */ la.office_code, la.currency_code AS currency, mf.NAME multifinance_id, la.contract_number, mc.customer_name,
dco.os_principal_on_schedule AS os_principal_on_schedule, f_get_param_value (la.financing_type, 'FinancingType'
) AS financing_type, CASE la.financing_type WHEN 11 -- Asset Purchase THEN NVL (tp.os_principal_cust,
la.os_principal_cust ) WHEN 12 -- JF Channelling THEN
NVL (tp.os_principal_mf, la.os_principal) END AS os_principal_actual, CASE WHEN dco.bi_collectibility_with_gp >= 3 THEN 0
ELSE CASE WHEN la.financing_type = '12' THEN NVL (ia.accrue_interest_pl, 0) + NVL (ia.accrue_interest_npl, 0)
ELSE NVL (ia.accrue_
Plan hash value: 4011856754
| Id | Operation | Name | Starts | E-Rows | A-Rows | A-Time | Buffers | Reads | OMem | 1Mem | Used-Mem |
| 1 | TABLE ACCESS BY INDEX ROWID | COLLECTIBILITY_CODE | 3 | 1 | 3 |00:00:00.01 | 9 | 2 | | | |
|* 2 | INDEX SKIP SCAN | UNQ_COLLECTIBILITY_CODE | 3 | 1 | 3 |00:00:00.01 | 6 | 1 | | | |
| 3 | TABLE ACCESS BY GLOBAL INDEX ROWID | MF_SCH_INSTALLMENT | 501 | 1 | 501 |00:00:00.03 | 2004 | 796 | | | |
|* 4 | INDEX UNIQUE SCAN | UNQ_MF_SCH_INSTALLMENT1 | 501 | 1 | 501 |00:00:00.02 | 1503 | 377 | | | |
| 5 | TABLE ACCESS BY GLOBAL INDEX ROWID | MF_SCH_INSTALLMENT | 333 | 1 | 333 |00:00:00.10 | 3220 | 1074 | | | |
|* 6 | INDEX UNIQUE SCAN | UNQ_MF_SCH_INSTALLMENT1 | 333 | 1 | 333 |00:00:00.09 | 2887 | 1074 | | | |
| 7 | TABLE ACCESS BY GLOBAL INDEX ROWID | CUST_SCH_INSTALLMENT | 168 | 1 | 167 |00:00:00.05 | 1464 | 495 | | | |
|* 8 | INDEX UNIQUE SCAN | UNQ_CUST_SCH_INSTALLMENT1 | 168 | 1 | 167 |00:00:00.05 | 1297 | 495 | | | |
| 9 | TABLE ACCESS BY GLOBAL INDEX ROWID | MF_SCH_INSTALLMENT | 333 | 1 | 333 |00:00:00.06 | 3167 | 0 | | | |
|* 10 | INDEX UNIQUE SCAN | UNQ_MF_SCH_INSTALLMENT1 | 333 | 1 | 333 |00:00:00.06 | 2834 | 0 | | | |
| 11 | TABLE ACCESS BY GLOBAL INDEX ROWID | CUST_SCH_INSTALLMENT | 168 | 1 | 167 |00:00:00.03 | 1447 | 0 | | | |
|* 12 | INDEX UNIQUE SCAN | UNQ_CUST_SCH_INSTALLMENT1 | 168 | 1 | 167 |00:00:00.03 | 1280 | 0 | | | |
| 13 | TABLE ACCESS BY GLOBAL INDEX ROWID | MF_SCH_INSTALLMENT | 333 | 1 | 333 |00:00:00.06 | 3167 | 0 | | | |
|* 14 | INDEX UNIQUE SCAN | UNQ_MF_SCH_INSTALLMENT1 | 333 | 1 | 333 |00:00:00.06 | 2834 | 0 | | | |
| 15 | TABLE ACCESS BY GLOBAL INDEX ROWID | CUST_SCH_INSTALLMENT | 168 | 1 | 167 |00:00:00.03 | 1447 | 0 | | | |
|* 16 | INDEX UNIQUE SCAN | UNQ_CUST_SCH_INSTALLMENT1 | 168 | 1 | 167 |00:00:00.03 | 1280 | 0 | | | |
| 17 | TABLE ACCESS BY GLOBAL INDEX ROWID | MF_SCH_INSTALLMENT | 333 | 1 | 333 |00:00:00.06 | 3167 | 0 | | | |
|* 18 | INDEX UNIQUE SCAN | UNQ_MF_SCH_INSTALLMENT1 | 333 | 1 | 333 |00:00:00.06 | 2834 | 0 | | | |
| 19 | TABLE ACCESS BY GLOBAL INDEX ROWID | CUST_SCH_INSTALLMENT | 168 | 1 | 167 |00:00:00.03 | 1447 | 0 | | | |
|* 20 | INDEX UNIQUE SCAN | UNQ_CUST_SCH_INSTALLMENT1 | 168 | 1 | 167 |00:00:00.03 | 1280 | 0 | | | |
|* 21 | TABLE ACCESS FULL | COLLECTIBILITY_CODE | 3 | 1 | 3 |00:00:00.01 | 12 | 1 | | | |
| 22 | NESTED LOOPS OUTER | | 1 | 2 | 501 |00:00:01.02 | 96112 | 20091 | | | |
| 23 | NESTED LOOPS | | 1 | 2 | 501 |00:00:00.28 | 13445 | 5358 | | | |
| 24 | NESTED LOOPS | | 1 | 2 | 501 |00:00:00.26 | 11441 | 5071 | | | |
| 25 | NESTED LOOPS OUTER | | 1 | 2 | 501 |00:00:00.24 | 9433 | 5014 | | | |
|* 26 | HASH JOIN | | 1 | 2 | 501 |00:00:00.03 | 329 | 325 | 1206K| 1206K| 341K (0)|
|* 27 | TABLE ACCESS FULL | CURRENCY | 1 | 1 | 1 |00:00:00.01 | 3 | 2 | | | |
|* 28 | HASH JOIN | | 1 | 61 | 501 |00:00:00.02 | 326 | 323 | 868K| 868K| 947K (0)|
|* 29 | HASH JOIN | | 1 | 10 | 13 |00:00:00.01 | 7 | 6 | 947K| 947K| 1030K (0)|
| 30 | TABLE ACCESS BY INDEX ROWID | MULTIFINANCE | 1 | 5 | 9 |00:00:00.01 | 2 | 2 | | | |
|* 31 | INDEX RANGE SCAN | IDX_STATUS_MF | 1 | 5 | 9 |00:00:00.01 | 1 | 1 | | | |
|* 32 | TABLE ACCESS FULL | AGREEMENT | 1 | 18 | 13 |00:00:00.01 | 5 | 4 | | | |
| 33 | VIEW | | 1 | 110 | 501 |00:00:00.02 | 319 | 317 | | | |
|* 34 | HASH JOIN RIGHT OUTER | | 1 | 110 | 501 |00:00:00.02 | 319 | 317 | 1011K| 1011K| 317K (0)|
| 35 | TABLE ACCESS BY INDEX ROWID | TENANT_PARAMETER | 1 | 1 | 1 |00:00:00.01 | 2 | 2 | | | |
|* 36 | INDEX UNIQUE SCAN | PK_TENANT_PARAMETER | 1 | 1 | 1 |00:00:00.01 | 1 | 1 | | | |
|* 37 | TABLE ACCESS BY GLOBAL INDEX ROWID| LOAN_ACCOUNT | 1 | 110 | 501 |00:00:00.02 | 317 | 315 | | | |
|* 38 | INDEX RANGE SCAN | IDX_STATUS_LA1 | 1 | 4394 | 3025 |00:00:00.01 | 15 | 14 | | | |
|* 39 | TABLE ACCESS BY INDEX ROWID | TX_PAYMENT | 501 | 1 | 0 |00:00:00.16 | 9104 | 4689 | | | |
|* 40 | INDEX RANGE SCAN | FK_TX_PAY_LOAN_ACCT | 501 | 12 | 8799 |00:00:00.02 | 1038 | 207 | | | |
| 41 | TABLE ACCESS BY INDEX ROWID | DL_CL_OUTSTANDING | 501 | 1 | 501 |00:00:00.02 | 2008 | 57 | | | |
|* 42 | INDEX RANGE SCAN | IDXLO_CNUM | 501 | 1 | 501 |00:00:00.01 | 1507 | 37 | | | |
|* 43 | TABLE ACCESS BY INDEX ROWID | MF_CUSTOMER | 501 | 1 | 501 |00:00:00.02 | 2004 | 287 | | | |
|* 44 | INDEX UNIQUE SCAN | MF_CUSTOMER_PK | 501 | 1 | 501 |00:00:00.01 | 1503 | 24 | | | |
|* 45 | TABLE ACCESS BY INDEX ROWID | TX_INTEREST_ACCRUE | 501 | 1 | 0 |00:00:00.73 | 82667 | 14733 | | | |
|* 46 | INDEX RANGE SCAN | FK_TX_INTEREST_ACCRUE_LOAN_ACC | 501 | 67 | 40581 |00:00:00.14 | 42084 | 451 | | | |
Predicate Information (identified by operation id):
2 - access("XX"."COLLECTIBILITY_CODE"=:B1)
filter("XX"."COLLECTIBILITY_CODE"=:B1)
4 - access("LOAN_ACCOUNT_ID"=:B1 AND "INSTALLMENT_NUMBER"=1)
6 - access("MFSCH"."LOAN_ACCOUNT_ID"=:B1 AND "MFSCH"."INSTALLMENT_NUMBER"="F_NEXT_INSTALLMENT_NUMBER"(:B2,TO_DATE(' 2013-02-18 00:00:00', 'syyyy-mm-dd
hh24:mi:ss'),:B3))
8 - access("CUSTSCH"."LOAN_ACCOUNT_ID"=:B1 AND "CUSTSCH"."INSTALLMENT_NUMBER"="F_NEXT_INSTALLMENT_NUMBER"(:B2,TO_DATE(' 2013-02-18 00:00:00', 'syyyy-mm-dd
hh24:mi:ss'),:B3))
10 - access("MFSCH"."LOAN_ACCOUNT_ID"=:B1 AND "MFSCH"."INSTALLMENT_NUMBER"="F_NEXT_INSTALLMENT_NUMBER"(:B2,TO_DATE(' 2013-02-18 00:00:00', 'syyyy-mm-dd
hh24:mi:ss'),:B3))
12 - access("CUSTSCH"."LOAN_ACCOUNT_ID"=:B1 AND "CUSTSCH"."INSTALLMENT_NUMBER"="F_NEXT_INSTALLMENT_NUMBER"(:B2,TO_DATE(' 2013-02-18 00:00:00', 'syyyy-mm-dd
hh24:mi:ss'),:B3))
14 - access("MFSCH"."LOAN_ACCOUNT_ID"=:B1 AND "MFSCH"."INSTALLMENT_NUMBER"="F_NEXT_INSTALLMENT_NUMBER"(:B2,TO_DATE(' 2013-02-18 00:00:00', 'syyyy-mm-dd
hh24:mi:ss'),:B3))
16 - access("CUSTSCH"."LOAN_ACCOUNT_ID"=:B1 AND "CUSTSCH"."INSTALLMENT_NUMBER"="F_NEXT_INSTALLMENT_NUMBER"(:B2,TO_DATE(' 2013-02-18 00:00:00', 'syyyy-mm-dd
hh24:mi:ss'),:B3))
18 - access("MFSCH"."LOAN_ACCOUNT_ID"=:B1 AND "MFSCH"."INSTALLMENT_NUMBER"="F_NEXT_INSTALLMENT_NUMBER"(:B2,TO_DATE(' 2013-02-18 00:00:00', 'syyyy-mm-dd
hh24:mi:ss'),:B3))
20 - access("CUSTSCH"."LOAN_ACCOUNT_ID"=:B1 AND "CUSTSCH"."INSTALLMENT_NUMBER"="F_NEXT_INSTALLMENT_NUMBER"(:B2,TO_DATE(' 2013-02-18 00:00:00', 'syyyy-mm-dd
hh24:mi:ss'),:B3))
21 - filter(TO_NUMBER("COL"."COLLECTIBILITY_CODE")=:B1)
26 - access("from$_subquery$_016"."CURRENCY_CODE"="CURR"."CURRENCY_CODE")
27 - filter(UPPER("CURR"."STATUS")='A')
28 - access("from$_subquery$_016"."AGREEMENT_ID"="A"."AGREEMENT_ID")
29 - access("A"."MULTIFINANCE_ID"="MF"."MULTIFINANCE_ID")
31 - access("MF"."SYS_NC00052$"='A')
32 - filter(UPPER("A"."STATUS")='A')
34 - access("LA"."TENANT_ID"="TENANT_ID")
36 - access("TENANT_PARAMETER_ID"=23)
37 - filter((UPPER("LA"."LOAN_STATUS")='AC' OR ("LA"."CLOSED_DATE"=TO_DATE(' 2013-02-18 00:00:00', 'syyyy-mm-dd hh24:mi:ss') AND
UPPER("LA"."LOAN_STATUS")='CN')))
38 - access("LA"."SYS_NC00118$"='A')
39 - filter(("TP"."APPROVAL_DATE"=TO_DATE(' 2013-02-18 00:00:00', 'syyyy-mm-dd hh24:mi:ss') AND "TP"."DATA_SOURCE"=152 AND UPPER("TP"."APPROVAL_STATUS")='A'))
40 - access("TP"."LOAN_ACCOUNT_ID"="from$_subquery$_016"."LOAN_ACCOUNT_ID")
42 - access("DCO"."LOAN_CONTRACT_NUMBER"="from$_subquery$_016"."CONTRACT_NUMBER")
43 - filter(UPPER("MC"."STATUS")='A')
44 - access("from$_subquery$_016"."MF_CUSTOMER_ID"="MC"."MF_CUSTOMER_ID")
45 - filter("IA"."ACCRUE_DATE"="XX"."PREV_DATE")
46 - access("LA"."LOAN_ACCOUNT_ID"="IA"."LOAN_ACCOUNT_ID")
The DBMS_XPLAN.DISPLAY_CURSOR output after : alter system flush buffer_cache; alter system flush shared_pool;
Query no 2
PLAN_TABLE_OUTPUT
SQL_ID cxmg4jfvr9pz0, child number 0
SELECT /*+ gather_plan_statistics */ la.office_code, la.currency_code AS currency, mf.NAME multifinance_id, la.contract_number, mc.customer_name,
dco.os_principal_on_schedule AS os_principal_on_schedule, f_get_param_value (la.financing_type, 'FinancingType'
) AS financing_type, CASE la.financing_type WHEN 11 -- Asset Purchase THEN NVL (tp.os_principal_cust,
la.os_principal_cust ) WHEN 12 -- JF Channelling THEN
NVL (tp.os_principal_mf, la.os_principal) END AS os_principal_actual, CASE WHEN dco.bi_collectibility_with_gp >= 3 THEN 0
ELSE CASE WHEN la.financing_type = '12' THEN NVL (ia.accrue_interest_pl, 0) + NVL (ia.accrue_interest_npl, 0)
ELSE NVL (ia.accrue_
Plan hash value: 2072372033
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | Pstart| Pstop |
| 0 | SELECT STATEMENT | | 4719 | 1622K| 188K (32)| 00:37:42 | | |
| 1 | TABLE ACCESS BY INDEX ROWID | COLLECTIBILITY_CODE | 1 | 12 | 3 (0)| 00:00:01 | | |
|* 2 | INDEX SKIP SCAN | UNQ_COLLECTIBILITY_CODE | 1 | | 2 (0)| 00:00:01 | | |
| 3 | TABLE ACCESS BY GLOBAL INDEX ROWID | MF_SCH_INSTALLMENT | 1 | 17 | 3 (0)| 00:00:01 | ROWID | ROWID |
|* 4 | INDEX UNIQUE SCAN | UNQ_MF_SCH_INSTALLMENT1 | 1 | | 2 (0)| 00:00:01 | | |
| 5 | TABLE ACCESS BY GLOBAL INDEX ROWID | MF_SCH_INSTALLMENT | 1 | 15 | 3 (0)| 00:00:01 | ROWID | ROWID |
|* 6 | INDEX UNIQUE SCAN | UNQ_MF_SCH_INSTALLMENT1 | 1 | | 2 (0)| 00:00:01 | | |
| 7 | TABLE ACCESS BY GLOBAL INDEX ROWID | CUST_SCH_INSTALLMENT | 1 | 15 | 3 (0)| 00:00:01 | ROWID | ROWID |
|* 8 | INDEX UNIQUE SCAN | UNQ_CUST_SCH_INSTALLMENT1 | 1 | | 2 (0)| 00:00:01 | | |
| 9 | TABLE ACCESS BY GLOBAL INDEX ROWID | MF_SCH_INSTALLMENT | 1 | 15 | 3 (0)| 00:00:01 | ROWID | ROWID |
|* 10 | INDEX UNIQUE SCAN | UNQ_MF_SCH_INSTALLMENT1 | 1 | | 2 (0)| 00:00:01 | | |
| 11 | TABLE ACCESS BY GLOBAL INDEX ROWID | CUST_SCH_INSTALLMENT | 1 | 15 | 3 (0)| 00:00:01 | ROWID | ROWID |
|* 12 | INDEX UNIQUE SCAN | UNQ_CUST_SCH_INSTALLMENT1 | 1 | | 2 (0)| 00:00:01 | | |
| 13 | TABLE ACCESS BY GLOBAL INDEX ROWID | MF_SCH_INSTALLMENT | 1 | 17 | 3 (0)| 00:00:01 | ROWID | ROWID |
|* 14 | INDEX UNIQUE SCAN | UNQ_MF_SCH_INSTALLMENT1 | 1 | | 2 (0)| 00:00:01 | | |
| 15 | TABLE ACCESS BY GLOBAL INDEX ROWID | CUST_SCH_INSTALLMENT | 1 | 17 | 3 (0)| 00:00:01 | ROWID | ROWID |
|* 16 | INDEX UNIQUE SCAN | UNQ_CUST_SCH_INSTALLMENT1 | 1 | | 2 (0)| 00:00:01 | | |
| 17 | TABLE ACCESS BY GLOBAL INDEX ROWID | MF_SCH_INSTALLMENT | 1 | 17 | 3 (0)| 00:00:01 | ROWID | ROWID |
|* 18 | INDEX UNIQUE SCAN | UNQ_MF_SCH_INSTALLMENT1 | 1 | | 2 (0)| 00:00:01 | | |
| 19 | TABLE ACCESS BY GLOBAL INDEX ROWID | CUST_SCH_INSTALLMENT | 1 | 17 | 3 (0)| 00:00:01 | ROWID | ROWID |
|* 20 | INDEX UNIQUE SCAN | UNQ_CUST_SCH_INSTALLMENT1 | 1 | | 2 (0)| 00:00:01 | | |
|* 21 | TABLE ACCESS FULL | COLLECTIBILITY_CODE | 1 | 12 | 3 (0)| 00:00:01 | | |
| 22 | NESTED LOOPS | | 4719 | 1622K| 188K (32)| 00:37:42 | | |
| 23 | NESTED LOOPS | | 4719 | 1460K| 183K (33)| 00:36:45 | | |
| 24 | NESTED LOOPS OUTER | | 4719 | 1354K| 180K (33)| 00:36:07 | | |
| 25 | NESTED LOOPS OUTER | | 4719 | 1225K| 130K (46)| 00:26:01 | | |
|* 26 | HASH JOIN | | 4719 | 1106K| 23591 (2)| 00:04:44 | | |
| 27 | TABLE ACCESS BY INDEX ROWID | MULTIFINANCE | 5 | 130 | 2 (0)| 00:00:01 | | |
|* 28 | INDEX RANGE SCAN | IDX_STATUS_MF | 5 | | 1 (0)| 00:00:01 | | |
|* 29 | HASH JOIN | | 8494 | 1775K| 23589 (2)| 00:04:44 | | |
|* 30 | TABLE ACCESS FULL | AGREEMENT | 18 | 360 | 3 (0)| 00:00:01 | | |
|* 31 | HASH JOIN | | 8494 | 1609K| 23585 (2)| 00:04:44 | | |
|* 32 | TABLE ACCESS FULL | CURRENCY | 1 | 4 | 3 (0)| 00:00:01 | | |
| 33 | VIEW | | 212K| 38M| 23579 (2)| 00:04:43 | | |
|* 34 | HASH JOIN RIGHT OUTER | | 212K| 32M| 23579 (2)| 00:04:43 | | |
| 35 | TABLE ACCESS BY INDEX ROWID| TENANT_PARAMETER | 1 | 74 | 1 (0)| 00:00:01 | | |
|* 36 | INDEX UNIQUE SCAN | PK_TENANT_PARAMETER | 1 | | 0 (0)| 00:00:01 | | |
| 37 | PARTITION LIST ALL | | 212K| 17M| 23575 (2)| 00:04:43 | 1 | 5 |
|* 38 | TABLE ACCESS FULL | LOAN_ACCOUNT_HAN | 212K| 17M| 23575 (2)| 00:04:43 | 1 | 5 |
| 39 | TABLE ACCESS BY INDEX ROWID | TX_INTEREST_ACCRUE | 1 | 26 | 130K (46)| 00:26:01 | | |
| 40 | BITMAP CONVERSION TO ROWIDS | | | | | | | |
| 41 | BITMAP AND | | | | | | | |
| 42 | BITMAP CONVERSION FROM ROWIDS| | | | | | | |
|* 43 | INDEX RANGE SCAN | FK_TX_INTEREST_ACCRUE_LOAN_ACC | 67 | | 0 (0)| 00:00:01 | | |
| 44 | BITMAP CONVERSION FROM ROWIDS| | | | | | | |
|* 45 | INDEX RANGE SCAN | IDX_TX_INTEREST_ACCRUE | 67 | | 12 (100)| 00:00:01 | | |
|* 46 | TABLE ACCESS BY INDEX ROWID | TX_PAYMENT | 1 | 28 | 11 (0)| 00:00:01 | | |
|* 47 | INDEX RANGE SCAN | FK_TX_PAY_LOAN_ACCT | 12 | | 0 (0)| 00:00:01 | | |
| 48 | TABLE ACCESS BY INDEX ROWID | DL_CL_OUTSTANDING | 1 | 23 | 1 (0)| 00:00:01 | | |
|* 49 | INDEX RANGE SCAN | IDXLO_CNUM | 1 | | 0 (0)| 00:00:01 | | |
|* 50 | TABLE ACCESS BY INDEX ROWID | MF_CUSTOMER | 1 | 35 | 1 (0)| 00:00:01 | | |
|* 51 | INDEX UNIQUE SCAN | MF_CUSTOMER_PK | 1 | | 0 (0)| 00:00:01 | | |
Predicate Information (identified by operation id):
2 - access("XX"."COLLECTIBILITY_CODE"=:B1)
filter("XX"."COLLECTIBILITY_CODE"=:B1)
4 - access("LOAN_ACCOUNT_ID"=:B1 AND "INSTALLMENT_NUMBER"=1)
6 - access("MFSCH"."LOAN_ACCOUNT_ID"=:B1 AND "MFSCH"."INSTALLMENT_NUMBER"="F_NEXT_INSTALLMENT_NUMBER"(:B2,TO_DATE('
2013-02-18 00:00:00', 'syyyy-mm-dd hh24:mi:ss'),:B3))
8 - access("CUSTSCH"."LOAN_ACCOUNT_ID"=:B1 AND "CUSTSCH"."INSTALLMENT_NUMBER"="F_NEXT_INSTALLMENT_NUMBER"(:B2,TO_DATE('
2013-02-18 00:00:00', 'syyyy-mm-dd hh24:mi:ss'),:B3))
10 - access("MFSCH"."LOAN_ACCOUNT_ID"=:B1 AND "MFSCH"."INSTALLMENT_NUMBER"="F_NEXT_INSTALLMENT_NUMBER"(:B2,TO_DATE('
2013-02-18 00:00:00', 'syyyy-mm-dd hh24:mi:ss'),:B3))
12 - access("CUSTSCH"."LOAN_ACCOUNT_ID"=:B1 AND "CUSTSCH"."INSTALLMENT_NUMBER"="F_NEXT_INSTALLMENT_NUMBER"(:B2,TO_DATE('
2013-02-18 00:00:00', 'syyyy-mm-dd hh24:mi:ss'),:B3))
14 - access("MFSCH"."LOAN_ACCOUNT_ID"=:B1 AND "MFSCH"."INSTALLMENT_NUMBER"="F_NEXT_INSTALLMENT_NUMBER"(:B2,TO_DATE('
2013-02-18 00:00:00', 'syyyy-mm-dd hh24:mi:ss'),:B3))
16 - access("CUSTSCH"."LOAN_ACCOUNT_ID"=:B1 AND "CUSTSCH"."INSTALLMENT_NUMBER"="F_NEXT_INSTALLMENT_NUMBER"(:B2,TO_DATE('
2013-02-18 00:00:00', 'syyyy-mm-dd hh24:mi:ss'),:B3))
18 - access("MFSCH"."LOAN_ACCOUNT_ID"=:B1 AND "MFSCH"."INSTALLMENT_NUMBER"="F_NEXT_INSTALLMENT_NUMBER"(:B2,TO_DATE('
2013-02-18 00:00:00', 'syyyy-mm-dd hh24:mi:ss'),:B3))
20 - access("CUSTSCH"."LOAN_ACCOUNT_ID"=:B1 AND "CUSTSCH"."INSTALLMENT_NUMBER"="F_NEXT_INSTALLMENT_NUMBER"(:B2,TO_DATE('
2013-02-18 00:00:00', 'syyyy-mm-dd hh24:mi:ss'),:B3))
21 - filter(TO_NUMBER("COL"."COLLECTIBILITY_CODE")=:B1)
26 - access("A"."MULTIFINANCE_ID"="MF"."MULTIFINANCE_ID")
28 - access(UPPER("STATUS")='A')
29 - access("from$_subquery$_016"."AGREEMENT_ID"="A"."AGREEMENT_ID")
30 - filter(UPPER("A"."STATUS")='A')
31 - access("from$_subquery$_016"."CURRENCY_CODE"="CURR"."CURRENCY_CODE")
32 - filter(UPPER("CURR"."STATUS")='A')
34 - access("LA"."TENANT_ID"="TENANT_ID"(+))
36 - access("TENANT_PARAMETER_ID"(+)=23)
38 - filter((UPPER("LA"."LOAN_STATUS")='AC' OR "LA"."CLOSED_DATE"=TO_DATE(' 2013-02-18 00:00:00', 'syyyy-mm-dd hh24:mi:ss')
AND UPPER("LA"."LOAN_STATUS")='CN') AND UPPER("LA"."STATUS")='A')
43 - access("LA"."LOAN_ACCOUNT_ID"="IA"."LOAN_ACCOUNT_ID"(+))
45 - access("IA"."ACCRUE_DATE"(+)="XX"."PREV_DATE")
46 - filter("TP"."APPROVAL_DATE"(+)=TO_DATE(' 2013-02-18 00:00:00', 'syyyy-mm-dd hh24:mi:ss') AND "TP"."DATA_SOURCE"(+)=152
AND UPPER("TP"."APPROVAL_STATUS"(+))='A')
47 - access("TP"."LOAN_ACCOUNT_ID"(+)="from$_subquery$_016"."LOAN_ACCOUNT_ID")
49 - access("DCO"."LOAN_CONTRACT_NUMBER"="from$_subquery$_016"."CONTRACT_NUMBER")
50 - filter(UPPER("MC"."STATUS")='A')
51 - access("from$_subquery$_016"."MF_CUSTOMER_ID"="MC"."MF_CUSTOMER_ID")Typically both query running on 10-12 seconds (or same execution time).
And I can't provide autotrace and tkprof output cause I cannot access via sqlplus.
Thanks very much for the link HOW TO: Post a SQL statement tuning request - template posting
Regards,
Sigcle
Edited by: SigCle on Feb 25, 2013 4:22 AM
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DB Version:10gR2
The below sql was running slow, so i took an explain planCheck your plan, the optimizer estimates that the following query:
select count(*)
from SHIP_DTL
where "SHIP_DTL"."PLT_ID"='AM834';only returns 200 records. Is this correct? Please post the result of above query.
It probably isn't the case, because retrieving 200 records per index range scan and single row random table access shouldn't take long, at maximum a couple of seconds if you need to read each block actually from disk rather than from the cache.
If the estimate is wrong you need to check the statistics on the table and index that were used by the optimizer to come to that conclusion.
Are you sure that this plan is the actual plan used at execution time? You can check for the actual plans used to execute by using the DBMS_XPLAN.DISPLAY_CURSOR function in 10g if the SQL is still cached in the Shared Pool. You need to pass the SQL_ID and SQL_CHILD_NUMBER which you can retrieve from V$SESSION while the statement is executing.
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/ -
How to export results of explain plan?
A colleague tells me that in an older version of SQLDeveloper (1.2.1, perhaps?), he was able to export the results of the explain plan operation (I don't know what export forms were available). In the current version (1.5.1), it generates a tree component with information I can look at, but there's no way to write out these results in any form. Am I missing something?
HOW TO TRANSPORT A SQL TUNING SET [ID 456019.1]
Modified 08-SEP-2008 Type HOWTO Status PUBLISHED
In this Document
Goal
Solution
Applies to:
Oracle Server - Enterprise Edition - Version: 10.2.0.1 to 11.1.0.6
Information in this document applies to any platform.
10.2.X,11.1.X
Goal
The Purpose of This Note is to Show the Steps needed to Transport a Sql Tuning Set from
One Database server to another Database Server.
Solution
The Sql Tuning Set name is small_sh_sts_4.It is on 10.2.0.2.0 Database server.
It has 4 sqls .
select sql_id, substr(sql_text,1, 15) text
from dba_sqlset_statements
where sqlset_name = 'small_sh_sts_4'
order by sql_id;
SQL_ID TEXT
4qdz7j26mdwzb SELECT /*+ my_q
6y289t15dqj9r SELECT /*+ my_q
ckm14c67njf0q SELECT /*+ my_q
g37muqb81wjau SELECT /*+ my_q
1) Create the Staging Table ON THE SOURCE SYSTEM ( IN this case 10.2.0.2.0 ) .
execute DBMS_SQLTUNE.CREATE_STGTAB_SQLSET(table_name =>'TEST');
PL/SQL procedure successfully completed.
SQL> select count(*) from test;
COUNT(*)
0
2) Popluate the table TEST using DBMS_SQLTUNE.PACK_STGTAB_SQLSET THE SOURCE SYSTEM (IN this case 10.2.0.2.0 )
execute DBMS_SQLTUNE.PACK_STGTAB_SQLSET(sqlset_name => 'small_sh_sts_4',staging_table_name => 'TEST');
PL/SQL procedure successfully completed.
select count(*) from test;
SQL> select count(*) from test;
COUNT(*)
4
3) Export the table table test on THE SOURCE SYSTEM ( IN this case 10.2.0.2.0 )
and move the table to the Destination Server
and Import it . The staging table TEST can also be moved using
the mechanism of choice such as datapump or database link.
While exporting the table you will see something like
About to export specified tables via Conventional Path ...
Table(T) or Partition(T:P) to be exported: (RETURN to quit) > TEST
. . exporting table TEST 4 rows exported
. . exporting table TEST_CBINDS 0 rows exported
. . exporting table TEST_CPLANS 34 rows exported
Import on the Destination system ( IN this CASE it was 11.1.0.6.0 )
While Importing the table you will see something like
. importing SH's objects into SH
. importing SH's objects into SH
. . importing table "TEST" 4 rows imported
. . importing table "TEST_CBINDS" 0 rows imported
. . importing table "TEST_CPLANS" 34 rows imported
Import terminated successfully without warnings.
SQL> select count(*) from test;
COUNT(*)
4
Verify the contents of DBA_SQLSET or USER_SQLSET on the Destination system
Select NAME,CREATED,STATEMENT_COUNT FROM DBA_SQLSET;
4) Unpack the table using DBMS_SQLTUNE.UNPACK_STGTAB_SQLSET on the Destination system ( IN this CASE it was 11.1.0.6.0 )
execute DBMS_SQLTUNE.UNPACK_STGTAB_SQLSET( sqlset_name => '%',-
replace => TRUE,-
staging_table_name => 'TEST');
Select NAME,OWNER,CREATED,STATEMENT_COUNT FROM DBA_SQLSET;
NAME CREATED STATEMENT_COUNT
small_sh_sts_4 24-AUG-07 4
Related
Products
•Oracle Database Products > Oracle Database > Oracle Database > Oracle Server - Enterprise Edition -
Explain Plan and Execution Plan in 10gR2.
Hi,
Version 10.2.0.1.0.
I have two questions:
1) If the explain plan differs from the execution path in this version, then, is it safe to assume that the statistics are stale (or not gathered at all) on the underlying tables?
2) Can you in any way make a query use RBO instead of CBO? (I know it doesn't make any sense since CBO is lot smarter, but, for purely academic reasons).
Thank you,
Rahul.The rule based optimizer is most definitely present in 10gR2. It might not be in the documentation, but it is still there.
C:\sql>sqlplus test/test
SQL*Plus: Release 10.2.0.2.0 - Production on Tue Oct 10 15:43:34 2006
Copyright (c) 1982, 2005, Oracle. All Rights Reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - Production
With the Partitioning, OLAP and Data Mining options
test@SVTEST> set autotrace traceonly
test@SVTEST> alter session set optimizer_mode=rule;
Session altered.
Elapsed: 00:00:00.01
test@SVTEST> select * from dual;
Elapsed: 00:00:00.03
Execution Plan
Plan hash value: 272002086
| Id | Operation | Name |
| 0 | SELECT STATEMENT | |
| 1 | TABLE ACCESS FULL| DUAL |
Note
- rule based optimizer used (consider using cbo)
Statistics
1 recursive calls
0 db block gets
3 consistent gets
2 physical reads
0 redo size
407 bytes sent via SQL*Net to client
381 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
test@SVTEST> -
Good Explain plan long execution.
Hi,
on 11.2.0.3 for a query I have following explain plan which sounds good but when executed by an application it does not finish.
It waits on db file scattered read. Thanks for your ideas.
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | INSERT STATEMENT | | 1 | 427 | 2 (0)| 00:00:01 |
| 1 | LOAD TABLE CONVENTIONAL | PS_PC_RT_RUN_TA24 | | | | |
|* 2 | FILTER | | | | | |
| 3 | TABLE ACCESS BY INDEX ROWID| PS_PRT_PRICE4 | 1 | 427 | 0 (0)| 00:00:01 |
|* 4 | INDEX RANGE SCAN | PSAPRT_PRICE4 | 1 | | 0 (0)| 00:00:01 |
|* 5 | TABLE ACCESS FULL | PS_PC_RT_RUN_TA24 | 1 | 57 | 2 (0)| 00:00:01 |
Query Block Name / Object Alias (identified by operation id):
1 - SEL$1
3 - SEL$1 / PRT@SEL$1
4 - SEL$1 / PRT@SEL$1
5 - SEL$2 / A@SEL$2
Predicate Information (identified by operation id):
2 - filter( NOT EXISTS (SELECT 0 FROM "PS_PC_RT_RUN_TA24" "A" WHERE
"A"."BUSINESS_UNIT"=:B1 AND "A"."PROJECT_ID"=:B2 AND "A"."ACTIVITY_ID"=:B3 AND
"A"."RESOURCE_ID"=:B4 AND "A"."PROCESS_INSTANCE"=2690469))
4 - access("PRT"."PROCESS_INSTANCE"=2690469)
5 - filter("A"."BUSINESS_UNIT"=:B1 AND "A"."PROJECT_ID"=:B2 AND "A"."ACTIVITY_ID"=:B3
AND "A"."RESOURCE_ID"=:B4 AND "A"."PROCESS_INSTANCE"=2690469)
SQL> show parameter optimizer
NAME TYPE VALUE
optimizer_capture_sql_plan_baselines boolean FALSE
optimizer_dynamic_sampling integer 2
optimizer_features_enable string 11.2.0.3
optimizer_index_caching integer 0
optimizer_index_cost_adj integer 100
optimizer_mode string ALL_ROWS
optimizer_secure_view_merging boolean TRUE
optimizer_use_invisible_indexes boolean FALSE
optimizer_use_pending_statistics boolean FALSE
optimizer_use_sql_plan_baselines boolean TRUEmany thanks Nicolas,
yes it is the famous standard PC_Pricing on step PC_PRICING.COPYTA2.Step01.S.
The query is :
INSERT INTO PS_PC_RT_RUN_TA24 (PROCESS_INSTANCE, BUSINESS_UNIT, PROJECT_ID, ACTIVITY_ID, RESOURCE_ID, LINE_NO, SEQ_NUM, RESOURCE_ID_FROM, ANALYSIS_TYPE, RESOURCE_TYPE, RESOURCE_CATEGORY, RESOURCE_SUB_CAT, CONTRACT_NUM, CONTRACT_LINE_NUM, RESOURCE_QUANTITY, FOREIGN_AMOUNT, RATE_OPTION, RATE_AMT, AMOUNT, TRANS_DT, ACCOUNTING_DT, INFO_FLD1, INFO_FLD2, EMPLID, TIME_RPTG_CD, JOBCODE, UOM_BILL, UNIT_OF_MEASURE, UNIT_AMT, FOREIGN_CURRENCY, RT_TYPE, OPRID, OVERRIDE_SRC, SRC_AN_TYPE, SRC_RES_CATEGORY, SRC_RES_SUB_CAT, SRC_RES_TYPE, TO_CUR, BUSINESS_UNIT_GL, ACCOUNT, ALTACCT, DEPTID, OPERATING_UNIT, PRODUCT, FUND_CODE, CLASS_FLD, PROGRAM_CODE, BUDGET_REF, AFFILIATE, AFFILIATE_INTRA1, AFFILIATE_INTRA2, CHARTFIELD1, CHARTFIELD2, CHARTFIELD3, SYSTEM_SOURCE, PROCESS_STATUS, BI_DISTRIB_STATUS, RATE_PLAN, DESCR, DESCR1, PROJ_ROLE, TIER_PRICE_SW, PRICED_RATE, RATE_MULT, RATE_DIV, CST_DISTRIB_STATUS, REV_DISTRIB_STATUS, RATE_DEF_TYPE, BUSINESS_UNIT_WO, WO_ID, WO_TASK_ID, RSRC_TYPE, RES_LN_NBR, PC_TEMPLATE_ID, COMBO_STATUS, COST_RATE, BILL_RATE, TEMPLATE_TYPE, RATE_PLAN_TYPE, RATE_DEF_BIL, RATE_DEF_COST, RATE_DEF_REV) SELECT PRT.PROCESS_INSTANCE, PRT.BUSINESS_UNIT, PRT.PROJECT_ID, PRT.ACTIVITY_ID, PRT.RESOURCE_ID, 1, 0, PRT.RESOURCE_ID, PRT.ANALYSIS_TYPE, PRT.RESOURCE_TYPE, PRT.RESOURCE_CATEGORY, PRT.RESOURCE_SUB_CAT, PRT.CONTRACT_NUM, PRT.CONTRACT_LINE_NUM, PRT.RESOURCE_QUANTITY, PRT.FOREIGN_AMOUNT, ' ', 0, 0, PRT.TRANS_DT, PRT.ACCOUNTING_DT, ' ', ' ', PRT.EMPLID, PRT.TIME_RPTG_CD, PRT.JOBCODE, ' ', PRT.UNIT_OF_MEASURE, 0, PRT.FOREIGN_CURRENCY, PRT.RT_TYPE, PRT.OPRID, 'N', ' ', ' ', ' ', ' ', ' ', PRT.BUSINESS_UNIT_GL, PRT.ACCOUNT, PRT.ALTACCT, PRT.DEPTID, PRT.OPERATING_UNIT, PRT.PRODUCT, PRT.FUND_CODE, PRT.CLASS_FLD, PRT.PROGRAM_CODE, PRT.BUDGET_REF, PRT.AFFILIATE, PRT.AFFILIATE_INTRA1, PRT.AFFILIATE_INTRA2, PRT.CHARTFIELD1, PRT.CHARTFIELD2, PRT.CHARTFIELD3, PRT.SYSTEM_SOURCE, PRT.PROCESS_STATUS, PRT.BI_DISTRIB_STATUS, PRT.RATE_PLAN, PRT.DESCR, ' ', PRT.PROJ_ROLE, PRT.TIER_PRICE_SW, PRT.PRICED_RATE, PRT.RATE_MULT, PRT.RATE_DIV, PRT.CST_DISTRIB_STATUS, PRT.REV_DISTRIB_STATUS, PRT.RATE_DEF_TYPE, PRT.BUSINESS_UNIT_WO, PRT.WO_ID, PRT.WO_TASK_ID, PRT.RSRC_TYPE, PRT.RES_LN_NBR, PRT.PC_TEMPLATE_ID, ' ', 0, 0, PRT.TEMPLATE_TYPE, PRT.RATE_PLAN_TYPE, PRT.RATE_DEF_BIL, PRT.RATE_DEF_COST, PRT.RATE_DEF_REV FROM PS_PRT_PRICE4 PRT WHERE PRT.PROCESS_INSTANCE = 2690469 AND NOT EXISTS ( SELECT 'X' FROM PS_PC_RT_RUN_TA24 A
WHERE A.BUSINESS_UNIT = PRT.BUSINESS_UNIT AND A.PROJECT_ID = PRT.PROJECT_ID AND A.ACTIVITY_ID = PRT.ACTIVITY_ID AND A.RESOURCE_ID = PRT.RESOURCE_ID AND A.PROCESS_INSTANCE = 2690469)
====================End of query=================================
Best regards. -
Cost in explain plan vs elapsed time
hi gurus,
i have two tables with identical data volume(same database/schema/tablespace) and the only difference between these two is, one partitioned on a date filed.
statistics are up to date.
same query is executed against both tables, no partition pruning involved.
select ....... from non-partitioned
execution plan cost=92
elapsed time=117612
select ... from partitioned
execution plan cost=3606
elapsed time=19559
though plan cost of query against non-partitioned is quite less than partitioned, elapsed time in v$sqlarea is higher than partitioned.
what could be the reason please?
thanks,
charles
Edited by: user570138 on May 6, 2010 6:54 AMuser570138 wrote:
if elapsed time value is very volatile(with the difference in explain plan cost) , then how can i compare the performance of the query?Note that the same query with same execution plan and same data can provide different execution times - and due to a number of factors. The primary one being that the first time the query is executed, it performs physical I/O and loads the data into the buffer cache - where the same subsequent query finds this data via cheaper and faster logical I/O in the cache.
in my case i want to compare the performance change before and after table partitioning.Then look at the actual utilisation cost of the query and not (variant) elapsed execution time. The most expensive operation on a db platform is typically I/O. The more I/O, the slower the execution time.
I/O can be decreased in a number of ways. The usual approach in the database environment is to provide better or alternative data structures, in order to create more optimal I/O paths.
So instead of using a hash table and separate PK b+tree index, using an index organised table. Instead of a single large table with indexes, a partitioned table with local indexes. Instead of joining plain tables, joining tables that have been clustered. Etc.
In most cases, when done correctly, these physical data structure changes do not even impact the application layer. The SQL and code in this layer should be blissfully unaware of the physical structure changes done to improve performance.
Likewise, changes in the logical layer (data model changes) can also improve performance. This of course does impact the application layer - and requires a proper design and implementation in the physical layer. Often proper data modeling is overlooked and flaws in it is attempted to be fixed by hacking the physical layer.
my aim is to measure the query performance improvements, if any, by partitioning an existing tableWhy not measure current I/O before an operation, and then after the operation - and use the difference to determine the amount of I/O performed by that operation?
This can be implemented in a start/stop watch fashion (instead of measuring time, measuring I/O) using the v$sesstat virtual performance view. -
SQL Tuning - Not understanding the explain plan.
Hi All,
I am using 11g R2 and I have 2 questions about tuning a query.
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
PL/SQL Release 11.2.0.3.0 - Production
CORE 11.2.0.3.0 Production
TNS for 64-bit Windows: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - ProductionMy parameters relevant to the optimizer are :
NAME TYPE VALUE
optimizer_capture_sql_plan_baselines boolean FALSE
optimizer_dynamic_sampling integer 2
optimizer_features_enable string 11.2.0.3
optimizer_index_caching integer 0
optimizer_index_cost_adj integer 100
optimizer_mode string ALL_ROWS
optimizer_secure_view_merging boolean TRUE
optimizer_use_invisible_indexes boolean FALSE
optimizer_use_pending_statistics boolean FALSE
optimizer_use_sql_plan_baselines boolean TRUEThe query I would like to execute is pretty simple. It just returns some exceptions with a filter.
SELECT ERO.DVC_EVT_ID, E.DVC_EVT_DTTM
FROM D1_DVC_EVT E, D1_DVC_EVT_REL_OBJ ERO
WHERE ERO.MAINT_OBJ_CD = 'D1-DEVICE'
AND ERO.PK_VALUE1 = :H1
AND ERO.DVC_EVT_ID = E.DVC_EVT_ID
AND E.DVC_EVT_TYPE_CD IN ('END-GSMLOWLEVEL-EXCP-SEV-1', 'STR-GSMLOWLEVEL-EXCP-SEV-1')
ORDER BY E.DVC_EVT_DTTM DESC;The execution plan is the following :
Plan hash value: 3627978539
| Id | Operation | Name | Starts | E-Rows |E-Bytes| Cost (%CPU)| Pstart| Pstop | A-Rows | A-Time | Buffers | Reads | OMem | 1Mem | Used-Mem |
| 0 | SELECT STATEMENT | | 1 | | | 7131 (100)| | | 1181 |00:00:17.17 | 8627 | 2978 | | | |
| 1 | SORT ORDER BY | | 1 | 3137 | 275K| 7131 (1)| | | 1181 |00:00:17.17 | 8627 | 2978 | 80896 | 80896 |71680 (0)|
| 2 | NESTED LOOPS | | 1 | | | | | | 1181 |00:00:17.16 | 8627 | 2978 | | | |
| 3 | NESTED LOOPS | | 1 | 3137 | 275K| 7130 (1)| | | 2058 |00:00:08.09 | 6709 | 1376 | | | |
| 4 | TABLE ACCESS BY INDEX ROWID | D1_DVC_EVT_REL_OBJ | 1 | 3137 | 125K| 845 (1)| | | 2058 |00:00:04.37 | 820 | 799 | | | |
|* 5 | INDEX RANGE SCAN | D1T404S0 | 1 | 3137 | | 42 (0)| | | 2058 |00:00:00.08 | 27 | 23 | | | |
| 6 | PARTITION RANGE ITERATOR | | 2058 | 1 | | 1 (0)| KEY | KEY | 2058 |00:00:03.69 | 5889 | 577 | | | |
|* 7 | INDEX UNIQUE SCAN | D1T400P0 | 2058 | 1 | | 1 (0)| KEY | KEY | 2058 |00:00:03.66 | 5889 | 577 | | | |
|* 8 | TABLE ACCESS BY GLOBAL INDEX ROWID| D1_DVC_EVT | 2058 | 1 | 49 | 2 (0)| ROWID | ROWID | 1181 |00:00:09.05 | 1918 | 1602 | | | |
Peeked Binds (identified by position):
1 - (VARCHAR2(30), CSID=178): '271792300706'
Predicate Information (identified by operation id):
5 - access("ERO"."PK_VALUE1"=:H1 AND "ERO"."MAINT_OBJ_CD"='D1-DEVICE')
filter("ERO"."MAINT_OBJ_CD"='D1-DEVICE')
7 - access("ERO"."DVC_EVT_ID"="E"."DVC_EVT_ID")
8 - filter(("E"."DVC_EVT_TYPE_CD"='END-GSMLOWLEVEL-EXCP-SEV-1' OR "E"."DVC_EVT_TYPE_CD"='STR-GSMLOWLEVEL-EXCP-SEV-1'))So as you can see, row 8, I have a TABLE ACCESS BY GLOBAL INDEX ROWID. But what I am failling to see is how Oracle display a TABLE ACCESS BY GLOBAL INDEX ROWID without using any index. As thought that Oracle always got a ROWID because of an index.
I also have an index on the column DVC_EVT_TYPE_CD in my table (row 8 of the predicate information section)
And finally what would be your suggestion to improve the runtime of this query...
Many thanks.if I read the rowsource statistics information and the plan correctly then the table access in step 4 on D1_DVC_EVT_REL_OBJ needs 4.37 sec and accesses 820 buffers. If you had an index D1_DVC_EVT_REL_OBJ(MAINT_OBJ_CD, PK_VALUE1, DVC_EVT_ID) I assume that this table access could be avoided. To avoid the table access on D1_DVC_EVT an index on D1_DVC_EVT(DVC_EVT_ID, DVC_EVT_TYPE_CD, DVC_EVT_DTTM) should be sufficient.
I think these indexes would improve the performance of the given query but of course they would have a negative impact on DML performance on the table and they could influence other queries on the table. -
SQL Tuning Advisor Recommends New Explain Plan
Hi:
I have to believe this has been asked before but didn't see it in a forum search so I'll ask here. I had SQL Tuning Advisor look at a query and it is recommending a new plan for a 50+% improvement (hazah!). The trouble is, I don't want Oracle to re-write the plan to execute the query better, I want to know how I can re-write the query to generate that more optimal plan in the first place because I have similar systems in the field that I would like to also be optimized. What are my options?
Thanks.Sorry Gaff I know where you are talking about but I don't have your answer, but it may be a good start going over the 19g reference guide for these dictionary views -
SQL> select view_name from dba_views where view_name like 'DBA%ADVISOR%' ;
VIEW_NAME
DBA_ADVISOR_DEFINITIONS
DBA_ADVISOR_COMMANDS
DBA_ADVISOR_OBJECT_TYPES
DBA_ADVISOR_USAGE
DBA_ADVISOR_TASKS
DBA_ADVISOR_TEMPLATES
DBA_ADVISOR_LOG
...Best regards. -
Inconsistent results between SDO_RELATE and SDO_GEOM.RELATE
Maybe its the Friday syndrome, but I'm getting some results that I can't get my head around...
Let say I have a table with a single line geometry...
CREATE TABLE BUFFER_TEST (
WHAT VARCHAR2(100),
GEOMETRY SDO_GEOMETRY);
INSERT INTO user_sdo_geom_metadata VALUES ('BUFFER_TEST','GEOMETRY',
MDSYS.SDO_DIM_ARRAY(
MDSYS.SDO_DIM_ELEMENT('X',400000,750000,0.0005),
MDSYS.SDO_DIM_ELEMENT('Y',500000,1000000,0.0005)),
262152);
CREATE INDEX BUFFER_TEST_IDX ON BUFFER_TEST (GEOMETRY) INDEXTYPE IS MDSYS.SPATIAL_INDEX;
INSERT INTO BUFFER_TEST (what, geometry)
VALUES ('line',
SDO_GEOMETRY(2002, 262152, NULL, SDO_ELEM_INFO_ARRAY(1, 2, 1),
SDO_ORDINATE_ARRAY(713353.165, 736165.812, 713353.449, 736165.402, 713353.849,
736164.203, 713353.85, 736162.252, 713353.087, 736149.092)));
COMMIT;Now I want to buffer this line and check if the line is inside the buffer - the actual business need is to see if other lines are in the buffer, but we'll keep it simple for now...
So in the snippet below, I'm buffering the line by 50cm and then using SDO_INSIDE to see if the line is inside the buffer - it isn't.
Then if I use SDO_GEOM.RELATE to determine the relationship, it says INSIDE, which is correct.
Then if I increase the buffer size to 1m, then SDO_INSIDE and SDO_GEOM.RELATE both return the correct result.
SQL> DECLARE
2 l_inside NUMBER;
3 l_small_buffer SDO_GEOMETRY;
4 l_determine VARCHAR2(100);
5 l_buffer_size NUMBER := 0.5;
6 BEGIN
7
8 SELECT SDO_GEOM.SDO_BUFFER(b.geometry, usgm.diminfo, l_buffer_size)
9 INTO l_small_buffer
10 FROM user_sdo_geom_metadata usgm, BUFFER_TEST b
11 WHERE usgm.table_name = 'BUFFER_TEST'
12 AND usgm.column_name = 'GEOMETRY'
13 AND b.what = 'line';
14
15 SELECT COUNT(*)
16 INTO l_inside
17 FROM BUFFER_TEST
18 WHERE SDO_INSIDE(geometry, l_small_buffer) = 'TRUE'
19 AND what = 'line';
20
21 SELECT SDO_GEOM.RELATE(geometry, 'determine', l_small_buffer, 0.0005) relationship
22 INTO l_determine
23 FROM BUFFER_TEST
24 WHERE what = 'line';
25
26 DBMS_OUTPUT.PUT_LINE('l_inside: ' || l_inside || ' relationship ' || l_determine);
27
28 END;
29 /
l_inside: 0 relationship INSIDEAny help would be much appreciated... I'm starting to pull my hair out on this.
This is on Oracle 10.2.0.3I can reproduce this on 11.1.0.6 on Windows 32bit.
Would you recommend I open a support case on this? Do you think it would be possible to backport a fix to 10.2.0.4? -
SQL Tuning and OPTIMIZER - Execution Time with " AND col .."
Hi all,
I get a question about SQL Tuning and OPTIMIZER.
There are three samples with EXPLAIN PLAN and execution time.
This "tw_pkg.getMaxAktion" is a PLSQL Package.
1.) Execution Time : 0.25 Second
2.) Execution Time : 0.59 Second
3.) Execution Time : 1.11 Second
The only difference is some additional "AND col <> .."
Why is this execution time growing so strong?
Many Thanks,
Thomas
----[First example]---
Connected to Oracle Database 10g Enterprise Edition Release 10.2.0.3.0
Connected as dbadmin2
SQL>
SQL> EXPLAIN PLAN FOR
2 SELECT * FROM ( SELECT studie_id, tw_pkg.getMaxAktion(studie_id) AS max_aktion_id
3 FROM studie
4 ) max_aktion
5 WHERE max_aktion.max_aktion_id < 900 ;
Explained
SQL> SELECT * FROM TABLE(dbms_xplan.display);
PLAN_TABLE_OUTPUT
Plan hash value: 3201460684
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time
| 0 | SELECT STATEMENT | | 220 | 880 | 5 (40)| 00:00:
|* 1 | INDEX FAST FULL SCAN| SYS_C005393 | 220 | 880 | 5 (40)| 00:00:
Predicate Information (identified by operation id):
1 - filter("TW_PKG"."GETMAXAKTION"("STUDIE_ID")<900)
13 rows selected
SQL>
Execution time (PL/SQL Developer says): 0.25 seconds
----[/First]---
----[Second example]---
Connected to Oracle Database 10g Enterprise Edition Release 10.2.0.3.0
Connected as dbadmin2
SQL>
SQL> EXPLAIN PLAN FOR
2 SELECT * FROM ( SELECT studie_id, tw_pkg.getMaxAktion(studie_id) AS max_aktion_id
3 FROM studie
4 ) max_aktion
5 WHERE max_aktion.max_aktion_id < 900
6 AND max_aktion.max_aktion_id <> 692;
Explained
SQL> SELECT * FROM TABLE(dbms_xplan.display);
PLAN_TABLE_OUTPUT
Plan hash value: 3201460684
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time
| 0 | SELECT STATEMENT | | 11 | 44 | 6 (50)| 00:00:
|* 1 | INDEX FAST FULL SCAN| SYS_C005393 | 11 | 44 | 6 (50)| 00:00:
Predicate Information (identified by operation id):
1 - filter("TW_PKG"."GETMAXAKTION"("STUDIE_ID")<900 AND
"TW_PKG"."GETMAXAKTION"("STUDIE_ID")<>692)
14 rows selected
SQL>
Execution time (PL/SQL Developer says): 0.59 seconds
----[/Second]---
----[Third example]---
SQL> EXPLAIN PLAN FOR
2 SELECT * FROM ( SELECT studie_id, tw_pkg.getMaxAktion(studie_id) AS max_aktion_id
3 FROM studie
4 ) max_aktion
5 WHERE max_aktion.max_aktion_id < 900
6 AND max_aktion.max_aktion_id <> 692
7 AND max_aktion.max_aktion_id <> 392;
Explained
SQL> SELECT * FROM TABLE(dbms_xplan.display);
PLAN_TABLE_OUTPUT
Plan hash value: 3201460684
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time
| 0 | SELECT STATEMENT | | 1 | 4 | 6 (50)| 00:00:
|* 1 | INDEX FAST FULL SCAN| SYS_C005393 | 1 | 4 | 6 (50)| 00:00:
Predicate Information (identified by operation id):
1 - filter("TW_PKG"."GETMAXAKTION"("STUDIE_ID")<900 AND
"TW_PKG"."GETMAXAKTION"("STUDIE_ID")<>692 AND
"TW_PKG"."GETMAXAKTION"("STUDIE_ID")<>392)
15 rows selected
SQL>
Execution time (PL/SQL Developer says): 1.11 seconds
----[/Third]---Edited by: thomas_w on Jul 9, 2010 11:35 AM
Edited by: thomas_w on Jul 12, 2010 8:29 AMHi,
this is likely because SQL Developer fetches and displays only limited number of rows from query results.
This number is a parameter called 'sql array fetch size', you can find it in SQL Developer preferences under Tools/Preferences/Database/Advanced tab, and it's default value is 50 rows.
Query scans a table from the beginning and continue scanning until first 50 rows are selected.
If query conditions are more selective, then more table rows (or index entries) must be scanned to fetch first 50 results and execution time grows.
This effect is usually unnoticeable when query uses simple and fast built-in comparison operators (like = <> etc) or oracle built-in functions, but your query uses a PL/SQL function that is much more slower than built-in functions/operators.
Try to change this parameter to 1000 and most likely you will see that execution time of all 3 queries will be similar.
Look at this simple test to figure out how it works:
CREATE TABLE studie AS
SELECT row_number() OVER (ORDER BY object_id) studie_id, o.*
FROM (
SELECT * FROM all_objects
CROSS JOIN
(SELECT 1 FROM dual CONNECT BY LEVEL <= 100)
) o;
CREATE INDEX studie_ix ON studie(object_name, studie_id);
ANALYZE TABLE studie COMPUTE STATISTICS;
CREATE OR REPLACE FUNCTION very_slow_function(action IN NUMBER)
RETURN NUMBER
IS
BEGIN
RETURN action;
END;
/'SQL array fetch size' parameter in SQLDeveloper has been set to 50 (default). We will run 3 different queries on test table.
Query 1:
SELECT * FROM ( SELECT studie_id, very_slow_function(studie_id) AS max_aktion_id
FROM studie
) max_aktion
WHERE max_aktion.max_aktion_id < 900
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 1 1.22 1.29 0 1310 0 50
total 3 1.22 1.29 0 1310 0 50
Misses in library cache during parse: 1
Optimizer mode: ALL_ROWS
Parsing user id: 93 (TEST)
Rows Row Source Operation
50 INDEX FAST FULL SCAN STUDIE_IX (cr=1310 pr=0 pw=0 time=355838 us cost=5536 size=827075 card=165415)(object id 79865)
Rows Execution Plan
0 SELECT STATEMENT MODE: ALL_ROWS
50 INDEX MODE: ANALYZED (FAST FULL SCAN) OF 'STUDIE_IX' (INDEX)Query 2:
SELECT * FROM ( SELECT studie_id, very_slow_function(studie_id) AS max_aktion_id
FROM studie
) max_aktion
WHERE max_aktion.max_aktion_id < 900
AND max_aktion.max_aktion_id > 800
call count cpu elapsed disk query current rows
Parse 1 0.00 0.01 0 0 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 1 8.40 8.62 0 9351 0 50
total 3 8.40 8.64 0 9351 0 50
Misses in library cache during parse: 1
Optimizer mode: ALL_ROWS
Parsing user id: 93 (TEST)
Rows Row Source Operation
50 INDEX FAST FULL SCAN STUDIE_IX (cr=9351 pr=0 pw=0 time=16988202 us cost=5552 size=41355 card=8271)(object id 79865)
Rows Execution Plan
0 SELECT STATEMENT MODE: ALL_ROWS
50 INDEX MODE: ANALYZED (FAST FULL SCAN) OF 'STUDIE_IX' (INDEX)Query 3:
SELECT * FROM ( SELECT studie_id, very_slow_function(studie_id) AS max_aktion_id
FROM studie
) max_aktion
WHERE max_aktion.max_aktion_id = 600
call count cpu elapsed disk query current rows
Parse 1 0.01 0.00 0 0 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 1 18.72 19.16 0 19315 0 1
total 3 18.73 19.16 0 19315 0 1
Misses in library cache during parse: 1
Optimizer mode: ALL_ROWS
Parsing user id: 93 (TEST)
Rows Row Source Operation
1 INDEX FAST FULL SCAN STUDIE_IX (cr=19315 pr=0 pw=0 time=0 us cost=5536 size=165415 card=33083)(object id 79865)
Rows Execution Plan
0 SELECT STATEMENT MODE: ALL_ROWS
1 INDEX MODE: ANALYZED (FAST FULL SCAN) OF 'STUDIE_IX' (INDEX)Query 1 - 1,29 sec, 50 rows fetched, 1310 index entries scanned to find these 50 rows.
Query 2 - 8,64 sec, 50 rows fetched, 9351 index entries scanned to find these 50 rows.
Query 3 - 19,16 sec, only 1 row fetched, 19315 index entries scanned (full index).
Now 'SQL array fetch size' parameter in SQLDeveloper has been set to 1000.
Query 1:
SELECT * FROM ( SELECT studie_id, very_slow_function(studie_id) AS max_aktion_id
FROM studie
) max_aktion
WHERE max_aktion.max_aktion_id < 900
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 1 18.35 18.46 0 19315 0 899
total 3 18.35 18.46 0 19315 0 899
Misses in library cache during parse: 0
Optimizer mode: ALL_ROWS
Parsing user id: 93 (TEST)
Rows Row Source Operation
899 INDEX FAST FULL SCAN STUDIE_IX (cr=19315 pr=0 pw=0 time=20571272 us cost=5536 size=827075 card=165415)(object id 79865)
Rows Execution Plan
0 SELECT STATEMENT MODE: ALL_ROWS
899 INDEX MODE: ANALYZED (FAST FULL SCAN) OF 'STUDIE_IX' (INDEX)Query 2:
SELECT * FROM ( SELECT studie_id, very_slow_function(studie_id) AS max_aktion_id
FROM studie
) max_aktion
WHERE max_aktion.max_aktion_id < 900
AND max_aktion.max_aktion_id > 800
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 1 18.79 18.86 0 19315 0 99
total 3 18.79 18.86 0 19315 0 99
Misses in library cache during parse: 0
Optimizer mode: ALL_ROWS
Parsing user id: 93 (TEST)
Rows Row Source Operation
99 INDEX FAST FULL SCAN STUDIE_IX (cr=19315 pr=0 pw=0 time=32805696 us cost=5552 size=41355 card=8271)(object id 79865)
Rows Execution Plan
0 SELECT STATEMENT MODE: ALL_ROWS
99 INDEX MODE: ANALYZED (FAST FULL SCAN) OF 'STUDIE_IX' (INDEX)Query 3:
SELECT * FROM ( SELECT studie_id, very_slow_function(studie_id) AS max_aktion_id
FROM studie
) max_aktion
WHERE max_aktion.max_aktion_id = 600
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 1 18.69 18.84 0 19315 0 1
total 3 18.69 18.84 0 19315 0 1
Misses in library cache during parse: 0
Optimizer mode: ALL_ROWS
Parsing user id: 93 (TEST)
Rows Row Source Operation
1 INDEX FAST FULL SCAN STUDIE_IX (cr=19315 pr=0 pw=0 time=0 us cost=5536 size=165415 card=33083)(object id 79865)
Rows Execution Plan
0 SELECT STATEMENT MODE: ALL_ROWS
1 INDEX MODE: ANALYZED (FAST FULL SCAN) OF 'STUDIE_IX' (INDEX)And now:
Query 1 - 18.46 sec, 899 rows fetched, 19315 index entries scanned.
Query 2 - 18.86 sec, 99 rows fetched, 19315 index entries scanned.
Query 3 - 18.84 sec, 1 row fetched, 19315 index entries scanned. -
Real explain plan differs from one in v$sqlarea
I have some more or less complex queries which I catch on runtime by reading v$sqlarea table to find sql with high cost..
but..
I found some highly costed sql, but when I run it through client ti see it's explain plan and execution time, it's much faster with very little cost
why?
am I wrong when I read v$sqlarea?
I'm using Oracle 11g R2This is not at all surprising. Jonathan Lewis and many other have discussed this numerous times both in these forums, in books, in white papers, and in conference presentations.
That said ... you should be looking in gv$sql_plan. -
How to provide tuning solution from explain plan only
Dear all,
If I do not have any kind of access to the database and only have explain plan with me,how I can provideperformance or query tuning solutions from that??
Regards
Anirban958657,
If I do not have any kind of access to the database and only have explain plan with me,how I can provide performance or query tuning solutions from that??
This is contradictory as you said you don't have access but you have explain plan. You wont get any explain plan until you connect to the database and run "Explain plan for" statement for the query. How do you get the "explain plan"? If it is provided by someone to you, you might request to get the "Execution Plan" for the query.
Keep in mind that "explain plan" and "execution plan " - these two are not same.
Explain plan is not enough for predicting elapsed/response time of a query as Explain plan is static Whereas Execution plan is dynamic and talks about query in execution.
Oracle provides following things for a query to diagnose its performance :
1. Static - Explain plan - Not enough
2. Dynamic: Execution plan - Run time Plan
3. awr/ statspack execution plan --Run time from the past - this is again dynamic execution plan of query runs in the past
Tuning recommendation is possible by comparing run time of the same query in the past and today's run time and based on further analysis.
Tuning Recommendation is not possible if you have only Explain plan. -
Explain Plan Diff not available yet on Mac ?
Hi,
I followed the Online tutorial for the new Explain Plan Diff feature, however when I right-click the tab of the auto-trace no menu appears at all.
Am I doing something wrong or is this feature not yet available on the Mac version or has it been forgotten ?
I have this version:
Oracle SQL Developer 3.0.02
Version 3.0.02
Build MAIN-02.83
Copyright © 2005,2010 Oracle. All Rights Reserved.
IDE Version: 11.1.1.4.37.58.80
Product ID: oracle.sqldeveloper
Product Version: 11.1.2.02.83
jdk 1.6.0_22
thanks, ArjanAlthough I don't have a native Mac or Linux environment to test this, the context menus for the various worksheet tabs (Query Results / Autotrace / Explain Plan) have problems. I tried the following using a fresh install of SQL Dev 3.0 EA2 (including JRE 1.6.0_11):
1) VNC between two Windows XP boxes. Context menus work fine.
2) VNC (RealVNC 4.1.3 or TightVNC 2.0.2 clients) from Windows XP to Linux (Xvnc 4.0). Context menus do not appear.
3) Tarantella (Sun Secure Global Desktop Native Client [4.31.953]) from Windows XP to Linux. Context menus do not appear.
Finally, I tried the SQL Dev 2.1.1.64.65 on the OTN Developer Days image (OEL 5) under Sun Virtual Box on my XP box. No context menus. -
Differenet Explain Plan for Same Query
DB Version : 11.2.0.3
OS Version : AIX 6
I have two Queries ( The Difference between Them Only 940 and 584 ) When I Generate Explain Plan Different Output Why ? Why CPU time is Different Each Time
First Query Statement :
INSERT INTO TempSearchResult (t_aid,
t_umidl,
t_umidh,
X_CREA_DATE_TIME_MESG)
SELECT z.aid,
z.mesg_s_umidl,
z.mesg_s_umidh,
z.mesg_crea_date_time
FROM ( SELECT m.aid,
m.mesg_s_umidl,
m.mesg_s_umidh,
m.mesg_crea_date_time
FROM RSMESG_ESIDE m
WHERE 1 = 1
AND m.mesg_crea_date_time BETWEEN TO_DATE (
'20120131 10:00:00',
'YYYYMMDD HH24:MI:SS')
AND TO_DATE (
'20120131 13:00:00',
'YYYYMMDD HH24:MI:SS')
AND m.mesg_frmt_name = 'Swift'
AND m.mesg_sender_x1 = 'SOGEFRPPXXX'
AND m.mesg_nature = 'FINANCIAL_MSG'
AND m.mesg_type LIKE '950'
ORDER BY mesg_crea_date_time) z
WHERE ROWNUM <= 5000
Explain Plan for First Query :
PLAN_TABLE_OUTPUT
Plan hash value: 3901722890
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | Pstart| Pstop |
| 0 | INSERT STATEMENT | | 2866 | 134K| 197 (3)| 00:00:03 | | |
| 1 | LOAD TABLE CONVENTIONAL | TEMPSEARCHRESULT | | | | | | |
|* 2 | COUNT STOPKEY | | | | | | | |
| 3 | VIEW | | 2866 | 134K| 197 (3)| 00:00:03 | | |
|* 4 | SORT ORDER BY STOPKEY | | 2866 | 333K| 197 (3)| 00:00:03 | | |
| 5 | NESTED LOOPS | | 2866 | 333K| 196 (2)| 00:00:03 | | |
PLAN_TABLE_OUTPUT
| 6 | NESTED LOOPS | | 1419 | 148K| 196 (2)| 00:00:03 | | |
|* 7 | HASH JOIN | | 1419 | 141K| 196 (2)| 00:00:03 | | |
| 8 | NESTED LOOPS | | 91 | 1911 | 2 (0)| 00:00:01 | | |
| 9 | TABLE ACCESS BY INDEX ROWID | SUSER | 1 | 10 | 1 (0)| 00:00:01 | | |
|* 10 | INDEX UNIQUE SCAN | IX_SUSER | 1 | | 0 (0)| 00:00:01 | | |
|* 11 | INDEX FULL SCAN | PK_SUNITUSERGROUP | 91 | 1001 | 1 (0)| 00:00:01 | | |
| 12 | PARTITION RANGE SINGLE | | 1450 | 114K| 193 (2)| 00:00:03 | 2 | 2 |
|* 13 | TABLE ACCESS BY LOCAL INDEX ROWID| RMESG | 1450 | 114K| 193 (2)| 00:00:03 | 2 | 2 |
|* 14 | INDEX SKIP SCAN | IX_RMESG | 415 | | 14 (15)| 00:00:01 | 2 | 2 |
|* 15 | INDEX UNIQUE SCAN | PK_SMSGUSERGROUP | 1 | 5 | 0 (0)| 00:00:01 | | |
|* 16 | INDEX UNIQUE SCAN | PK_SBICUSERGROUP | 2 | 24 | 0 (0)| 00:00:01 | | |
PLAN_TABLE_OUTPUT
PLAN_TABLE_OUTPUT
Predicate Information (identified by operation id):
2 - filter(ROWNUM<=5000)
4 - filter(ROWNUM<=5000)
7 - access("X_INST0_UNIT_NAME"="UNIT")
10 - access("SUSER"."USERNAME"="SIDE"."GETMYUSER"())
11 - access("SUSER"."GROUPID"="SUNITUSERGROUP"."GROUPID")
filter("SUSER"."GROUPID"="SUNITUSERGROUP"."GROUPID")
PLAN_TABLE_OUTPUT
13 - filter("RMESG"."MESG_SENDER_X1"='SOGEFRPPXXX' AND "RMESG"."MESG_NATURE"='FINANCIAL_MSG' AND
"RMESG"."MESG_FRMT_NAME"='Swift')
14 - access("RMESG"."MESG_CREA_DATE_TIME">=TO_DATE(' 2012-01-31 10:00:00', 'syyyy-mm-dd hh24:mi:ss') AND
"RMESG"."MESG_TYPE"='950' AND "RMESG"."MESG_CREA_DATE_TIME"<=TO_DATE(' 2012-01-31 13:00:00', 'syyyy-mm-dd hh24:mi:ss'))
filter("RMESG"."MESG_TYPE"='950')
15 - access("X_CATEGORY"="CATEGORY" AND "SUSER"."GROUPID"="SMSGUSERGROUP"."GROUPID")
16 - access("X_OWN_LT"="BICCODE" AND "SUSER"."GROUPID"="SBICUSERGROUP"."GROUPID")
40 rows selected.
Second query
INSERT INTO TempSearchResult (t_aid,
t_umidl,
t_umidh,
X_CREA_DATE_TIME_MESG)
SELECT z.aid,
z.mesg_s_umidl,
z.mesg_s_umidh,
z.mesg_crea_date_time
FROM ( SELECT m.aid,
m.mesg_s_umidl,
m.mesg_s_umidh,
m.mesg_crea_date_time
FROM RSMESG_ESIDE m
WHERE 1 = 1
AND m.mesg_crea_date_time BETWEEN TO_DATE (
'20120117 10:00:00',
'YYYYMMDD HH24:MI:SS')
AND TO_DATE (
'20120117 13:00:00',
'YYYYMMDD HH24:MI:SS')
AND m.mesg_frmt_name = 'Swift'
AND m.mesg_sender_x1 = 'SOGEFRPPGSS'
AND m.mesg_nature = 'FINANCIAL_MSG'
AND m.mesg_type LIKE '548'
ORDER BY mesg_crea_date_time) z
WHERE ROWNUM <= 5000
Explain Plan For Second Query :
PLAN_TABLE_OUTPUT
Plan hash value: 4106071428
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time | Pstart| Pstop |
| 0 | INSERT STATEMENT | | 1073 | 51504 | | 2622 (1)| 00:00:32 | | |
| 1 | LOAD TABLE CONVENTIONAL | TEMPSEARCHRESULT | | | | | | | |
|* 2 | COUNT STOPKEY | | | | | | | | |
| 3 | VIEW | | 1073 | 51504 | | 2622 (1)| 00:00:32 | | |
|* 4 | SORT ORDER BY STOPKEY | | 1073 | 124K| | 2622 (1)| 00:00:32 | | |
| 5 | NESTED LOOPS | | 1073 | 124K| | 2621 (1)| 00:00:32 | | |
PLAN_TABLE_OUTPUT
| 6 | NESTED LOOPS | | 531 | 56817 | | 2621 (1)| 00:00:32 | | |
| 7 | NESTED LOOPS | | 531 | 54162 | | 2621 (1)| 00:00:32 | | |
| 8 | NESTED LOOPS | | 543 | 49413 | | 2621 (1)| 00:00:32 | | |
| 9 | TABLE ACCESS BY INDEX ROWID | SUSER | 1 | 10 | | 1 (0)| 00:00:01 | | |
|* 10 | INDEX UNIQUE SCAN | IX_SUSER | 1 | | | 0 (0)| 00:00:01 | | |
| 11 | PARTITION RANGE SINGLE | | 543 | 43983 | | 2621 (1)| 00:00:32 | 2 | 2 |
|* 12 | TABLE ACCESS BY LOCAL INDEX ROWID| RMESG | 543 | 43983 | | 2621 (1)| 00:00:32 | 2 | 2 |
| 13 | BITMAP CONVERSION TO ROWIDS | | | | | | | | |
| 14 | BITMAP AND | | | | | | | | |
| 15 | BITMAP CONVERSION FROM ROWIDS | | | | | | | | |
|* 16 | INDEX RANGE SCAN | IX_SENDER | 25070 | | | 894 (1)| 00:00:11 | 2 | 2 |
PLAN_TABLE_OUTPUT
| 17 | BITMAP CONVERSION FROM ROWIDS | | | | | | | | |
| 18 | SORT ORDER BY | | | | 408K| | | | |
|* 19 | INDEX RANGE SCAN | IX_RMESG | 25070 | | | 1405 (1)| 00:00:17 | 2 | 2 |
|* 20 | INDEX UNIQUE SCAN | PK_SUNITUSERGROUP | 1 | 11 | | 0 (0)| 00:00:01 | | |
|* 21 | INDEX UNIQUE SCAN | PK_SMSGUSERGROUP | 1 | 5 | | 0 (0)| 00:00:01 | | |
|* 22 | INDEX UNIQUE SCAN | PK_SBICUSERGROUP | 2 | 24 | | 0 (0)| 00:00:01 | | |
Predicate Information (identified by operation id):
PLAN_TABLE_OUTPUT
2 - filter(ROWNUM<=5000)
4 - filter(ROWNUM<=5000)
10 - access("SUSER"."USERNAME"="SIDE"."GETMYUSER"())
12 - filter("RMESG"."MESG_NATURE"='FINANCIAL_MSG' AND "RMESG"."MESG_FRMT_NAME"='Swift')
16 - access("RMESG"."MESG_SENDER_X1"='SOGEFRPPGSS')
19 - access("RMESG"."MESG_CREA_DATE_TIME">=TO_DATE(' 2012-01-17 10:00:00', 'syyyy-mm-dd hh24:mi:ss') AND
"RMESG"."MESG_TYPE"='548' AND "RMESG"."MESG_CREA_DATE_TIME"<=TO_DATE(' 2012-01-17 13:00:00', 'syyyy-mm-dd hh24:mi:ss'))
filter("RMESG"."MESG_TYPE"='548' AND "RMESG"."MESG_CREA_DATE_TIME"<=TO_DATE(' 2012-01-17 13:00:00', 'syyyy-mm-dd
hh24:mi:ss') AND "RMESG"."MESG_CREA_DATE_TIME">=TO_DATE(' 2012-01-17 10:00:00', 'syyyy-mm-dd hh24:mi:ss'))
20 - access("X_INST0_UNIT_NAME"="UNIT" AND "SUSER"."GROUPID"="SUNITUSERGROUP"."GROUPID")
21 - access("X_CATEGORY"="CATEGORY" AND "SUSER"."GROUPID"="SMSGUSERGROUP"."GROUPID")
PLAN_TABLE_OUTPUT
22 - access("X_OWN_LT"="BICCODE" AND "SUSER"."GROUPID"="SBICUSERGROUP"."GROUPID")
45 rows selected.
Table Structure TEMPSEARCHRESULT
CREATE GLOBAL TEMPORARY TABLE TEMPSEARCHRESULT
T_AID NUMBER(3),
T_UMIDL NUMBER(10),
T_UMIDH NUMBER(10),
X_CREA_DATE_TIME_MESG DATE
ON COMMIT PRESERVE ROWS
NOCACHE;
CREATE INDEX SIDE.TEMP_SEARCH_INDEX ON SIDE.TEMPSEARCHRESULT
(T_AID, T_UMIDL, T_UMIDH, X_CREA_DATE_TIME_MESG);Again Thank you For your amazing Answer.
For indexes it's a balance. Check this query which is Simple
Select * from RMESGI generated Explain Plan for it to see effect of indexes .
PLAN_TABLE_OUTPUT
Plan hash value: 1686435785
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | Pstart| Pstop |
| 0 | SELECT STATEMENT | | 11M| 8920M| 376K (1)| 01:15:20 | | |
| 1 | PARTITION RANGE ALL| | 11M| 8920M| 376K (1)| 01:15:20 | 1 | 12 |
| 2 | TABLE ACCESS FULL | RMESG | 11M| 8920M| 376K (1)| 01:15:20 | 1 | 12 |
---------------------------------------------------------------------------------------------1:15:20 For table access and Full Scan Also , I generate new Indexes on the table like the following
CREATE TABLE RMESG(
aid NUMBER(3) NOT NULL,
mesg_s_umidl NUMBER(10) NOT NULL,
mesg_s_umidh NUMBER(10) NOT NULL,
mesg_validation_requested CHAR(18) NOT NULL,
mesg_validation_passed CHAR(18) NOT NULL,
mesg_class CHAR(16) NOT NULL,
mesg_is_text_readonly NUMBER(1) NOT NULL,
mesg_is_delete_inhibited NUMBER(1) NOT NULL,
mesg_is_text_modified NUMBER(1) NOT NULL,
mesg_is_partial NUMBER(1) NOT NULL,
mesg_crea_mpfn_name CHAR(24) NOT NULL,
mesg_crea_rp_name CHAR(24) NOT NULL,
mesg_crea_oper_nickname CHAR(151) NOT NULL,
mesg_crea_date_time DATE NOT NULL,
mesg_mod_oper_nickname CHAR(151) NOT NULL,
mesg_mod_date_time DATE NOT NULL,
mesg_frmt_name VARCHAR2(17) NOT NULL,
mesg_nature CHAR(14) NOT NULL,
mesg_sender_x1 CHAR(11) NOT NULL,
mesg_sender_corr_type VARCHAR2(24) NOT NULL,
mesg_uumid VARCHAR2(50) NOT NULL,
mesg_uumid_suffix NUMBER(10) NOT NULL,
x_own_lt CHAR(8) NOT NULL,
x_inst0_unit_name VARCHAR2(32) default 'NONE' NOT NULL,
x_category CHAR(1) NOT NULL,
archived NUMBER(1) NOT NULL,
restored NUMBER(1) NOT NULL,
mesg_related_s_umid CHAR(16) NULL,
mesg_status CHAR(12) NULL,
mesg_crea_appl_serv_name CHAR(24) NULL,
mesg_verf_oper_nickname CHAR(151) NULL,
mesg_data_last NUMBER(10) NULL,
mesg_token NUMBER(10) NULL,
mesg_batch_reference VARCHAR2(46) NULL,
mesg_cas_sender_reference VARCHAR2(40) NULL,
mesg_cas_target_rp_name VARCHAR2(20) NULL,
mesg_ccy_amount VARCHAR2(501) NULL,
mesg_copy_service_id VARCHAR2(4) NULL,
mesg_data_keyword1 VARCHAR2(80) NULL,
mesg_data_keyword2 VARCHAR2(80) NULL,
mesg_data_keyword3 VARCHAR2(80) NULL,
mesg_delv_overdue_warn_req NUMBER(1) NULL,
mesg_fin_ccy_amount VARCHAR2(24) NULL,
mesg_fin_value_date CHAR(6) NULL,
mesg_is_live NUMBER(1) NULL,
mesg_is_retrieved NUMBER(1) NULL,
mesg_mesg_user_group VARCHAR2(24) NULL,
mesg_network_appl_ind CHAR(3) NULL,
mesg_network_delv_notif_req NUMBER(1) NULL,
mesg_network_obso_period NUMBER(10) NULL,
mesg_network_priority CHAR(12) NULL,
mesg_possible_dup_creation VARCHAR2(8) NULL,
mesg_receiver_alia_name VARCHAR2(32) NULL,
mesg_receiver_swift_address CHAR(12) NULL,
mesg_recovery_accept_info VARCHAR2(80) NULL,
mesg_rel_trn_ref VARCHAR2(80) NULL,
mesg_release_info VARCHAR2(32) NULL,
mesg_security_iapp_name VARCHAR2(80) NULL,
mesg_security_required NUMBER(1) NULL,
mesg_sender_x2 VARCHAR2(21) NULL,
mesg_sender_x3 VARCHAR2(21) NULL,
mesg_sender_x4 VARCHAR2(21) NULL,
mesg_sender_branch_info VARCHAR2(71) NULL,
mesg_sender_city_name VARCHAR2(36) NULL,
mesg_sender_ctry_code VARCHAR2(3) NULL,
mesg_sender_ctry_name VARCHAR2(71) NULL,
mesg_sender_institution_name VARCHAR2(106) NULL,
mesg_sender_location VARCHAR2(106) NULL,
mesg_sender_swift_address CHAR(12) NULL,
mesg_sub_format VARCHAR2(6) NULL,
mesg_syntax_table_ver VARCHAR2(8) NULL,
mesg_template_name VARCHAR2(32) NULL,
mesg_trn_ref VARCHAR2(16) NULL,
mesg_type CHAR(3) NULL,
mesg_user_issued_as_pde NUMBER(1) NULL,
mesg_user_priority_code CHAR(4) NULL,
mesg_user_reference_text VARCHAR2(30) NULL,
mesg_zz41_is_possible_dup NUMBER(1) NULL,
x_fin_ccy CHAR(3) NULL,
x_fin_amount NUMBER(21,4) NULL,
x_fin_value_date DATE NULL,
x_fin_ocmt_ccy CHAR(3) NULL,
x_fin_ocmt_amount NUMBER(21,4) NULL,
x_receiver_x1 CHAR(11) NULL,
x_receiver_x2 VARCHAR2(21) NULL,
x_receiver_x3 VARCHAR2(21) NULL,
x_receiver_x4 VARCHAR2(21) NULL,
last_update DATE NULL,
set_id NUMBER(10) NULL,
mesg_requestor_dn VARCHAR2(101) NULL,
mesg_service VARCHAR2(31) NULL,
mesg_request_type VARCHAR2(31) NULL,
mesg_identifier VARCHAR2(31) NULL,
mesg_xml_query_ref1 VARCHAR2(101) NULL,
mesg_xml_query_ref2 VARCHAR2(101) NULL,
mesg_xml_query_ref3 VARCHAR2(101) NULL,
mesg_appl_sender_reference VARCHAR2(51) NULL,
mesg_payload_type VARCHAR2(31) NULL,
mesg_sign_digest_reference VARCHAR2(41) NULL,
mesg_sign_digest_value VARCHAR2(51) NULL,
mesg_use_pki_signature NUMBER(1) NULL
PARTITION BY RANGE(MESG_CREA_DATE_TIME) (
PARTITION SIDE_MIN VALUES LESS THAN (TO_DATE(20000101, 'YYYYMMDD')) TABLESPACE TBS_SIDEDB_DA_01);
CREATE UNIQUE INDEX SIDE.IX_PK_RMESG on SIDE.RMESG (AID, MESG_S_UMIDH, MESG_S_UMIDL, MESG_CREA_DATE_TIME) LOCAL;
ALTER TABLE SIDE.RMESG ADD CONSTRAINT IX_PK_RMESG PRIMARY KEY (AID, MESG_S_UMIDH, MESG_S_UMIDL, MESG_CREA_DATE_TIME) USING INDEX SIDE.IX_PK_RMESG;
CREATE INDEX SIDE.ix_rmesg_cassender ON SIDE.rmesg (MESG_CAS_SENDER_REFERENCE) LOCAL;
CREATE INDEX SIDE.ix_rmesg_creationdate ON SIDE.rmesg (MESG_CREA_DATE_TIME) LOCAL;
CREATE INDEX SIDE.ix_rmesg_trnref ON SIDE.rmesg (MESG_TRN_REF) LOCAL;
CREATE INDEX SIDE.ix_rmesg_uumid ON SIDE.rmesg (MESG_UUMID, MESG_UUMID_SUFFIX) LOCAL;
CREATE INDEX SIDE.IX_UNIT_NAME_RMESG on RMESG(mesg_crea_date_time,X_INST0_UNIT_NAME) LOCAL;
CREATE INDEX SIDE.IX_RMESG on RMESG(mesg_crea_date_time ,mesg_type,x_fin_ccy) LOCAL;
CREATE INDEX SIDE.IX_NAME_FORMAT_TYPE_RMESG on RMESG(mesg_frmt_name,mesg_sub_format,mesg_type,mesg_crea_date_time ) LOCAL;same Explain Plan Same Result .
I always remember TOM Quote "full scans are not evil, indexes are not good"
Which Mean Something Wrong Goes with Indexes , the partition depend on MESG_CREA_DATE_TIME Column I create Index for this column but same explain plan Appear every time. With Same Time.
Thank you
Osama -
Hi
i like to know how can i understand the output of the autotrace ..
my current sql explain plan is
Execution Plan
Plan hash value: 2038802176
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 9 | 1026 | 332 (3)| 00:00:04 |
| 1 | SORT ORDER BY | | 9 | 1026 | 332 (3)| 00:00:04 |
| 2 | HASH UNIQUE | | 9 | 1026 | 331 (3)| 00:00:04 |
| 3 | NESTED LOOPS | | | | | |
| 4 | NESTED LOOPS | | 9 | 1026 | 330 (2)| 00:00:04 |
|* 5 | TABLE ACCESS FULL | EATTEND_STUDENT_ATTENDANCE | 9 | 144 | 294 (3)|
|* 6 | INDEX RANGE SCAN | PERF_EATTEND_STUDENT_INFO_N99 | 7 | | 2 (0)| 0
|* 7 | TABLE ACCESS BY INDEX ROWID| EATTEND_STUDENT_INFO | 1 | 98 | 4 (0)| 0
how will i decide where is the performance issue ???
thanksDon't think you have any issues here, given the small number of rows you're query returns.
You can find useful information regariding interpreting execution plans by exploring these links:
http://download.oracle.com/docs/cd/B19306_01/server.102/b14211/ex_plan.htm#i16971
http://asktom.oracle.com/pls/apex/f?p=100:11:0::::P11_QUESTION_ID:111012348061
http://asktom.oracle.com/pls/apex/f?p=100:11:0::::P11_QUESTION_ID:231814117467
and do some searches on those sites yourself
Also, post your execution plan between the {noformat}{noformat} tag, so it'll stay formatted.
For example, when you type:
{noformat}select *
from dual{noformat}
it will appear as:select *
from dualwhen you post it on this forum.
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