Execution time from explain plan
Hi
How can i get the execution time of a query from explain plan (not tkprof). I don't see the execution time in the plan table output.
Thanks
Explain plan won't give execution time of a query because:
- it does not execute the query
- it only evaluates the execution plan and gives estimated costs
I dont't know if it is possible to deduce execution time from estimated cost.
Message was edited by:
Pierre Forstmann
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How to improve the query performance or tune query from Explain Plan
Hi
The following is my explain plan for sql query. (The plan is generated by Toad v9.7). How to fix the query?
SELECT STATEMENT ALL_ROWSCost: 4,160 Bytes: 25,296 Cardinality: 204
8 NESTED LOOPS Cost: 3 Bytes: 54 Cardinality: 1
5 NESTED LOOPS Cost: 2 Bytes: 23 Cardinality: 1
2 TABLE ACCESS BY INDEX ROWID TABLE AR.RA_CUSTOMER_TRX_ALL Cost: 1 Bytes: 13 Cardinality: 1
1 INDEX UNIQUE SCAN INDEX (UNIQUE) AR.RA_CUSTOMER_TRX_U1 Cost: 1 Cardinality: 1
4 TABLE ACCESS BY INDEX ROWID TABLE AR.HZ_CUST_ACCOUNTS Cost: 1 Bytes: 10 Cardinality: 1
3 INDEX UNIQUE SCAN INDEX (UNIQUE) AR.HZ_CUST_ACCOUNTS_U1 Cost: 1 Cardinality: 1
7 TABLE ACCESS BY INDEX ROWID TABLE AR.HZ_PARTIES Cost: 1 Bytes: 31 Cardinality: 1
6 INDEX UNIQUE SCAN INDEX (UNIQUE) AR.HZ_PARTIES_U1 Cost: 1 Cardinality: 1
10 TABLE ACCESS BY INDEX ROWID TABLE AR.RA_CUSTOMER_TRX_ALL Cost: 1 Bytes: 12 Cardinality: 1
9 INDEX UNIQUE SCAN INDEX (UNIQUE) AR.RA_CUSTOMER_TRX_U1 Cost: 1 Cardinality: 1
15 NESTED LOOPS Cost: 2 Bytes: 29 Cardinality: 1
12 TABLE ACCESS BY INDEX ROWID TABLE AR.RA_CUSTOMER_TRX_ALL Cost: 1 Bytes: 12 Cardinality: 1
11 INDEX UNIQUE SCAN INDEX (UNIQUE) AR.RA_CUSTOMER_TRX_U1 Cost: 1 Cardinality: 1
14 TABLE ACCESS BY INDEX ROWID TABLE ONT.OE_ORDER_HEADERS_ALL Cost: 1 Bytes: 17 Cardinality: 1
13 INDEX RANGE SCAN INDEX (UNIQUE) ONT.OE_ORDER_HEADERS_U2 Cost: 1 Cardinality: 1
21 FILTER
16 TABLE ACCESS FULL TABLE ONT.OE_TRANSACTION_TYPES_TL Cost: 2 Bytes: 1,127 Cardinality: 49
20 NESTED LOOPS Cost: 2 Bytes: 21 Cardinality: 1
18 TABLE ACCESS BY INDEX ROWID TABLE AR.RA_CUSTOMER_TRX_ALL Cost: 1 Bytes: 12 Cardinality: 1
17 INDEX UNIQUE SCAN INDEX (UNIQUE) AR.RA_CUSTOMER_TRX_U1 Cost: 1 Cardinality: 1
19 INDEX RANGE SCAN INDEX (UNIQUE) ONT.OE_ORDER_HEADERS_U2 Cost: 1 Bytes: 9 Cardinality: 1
23 TABLE ACCESS BY INDEX ROWID TABLE AR.RA_CUSTOMER_TRX_ALL Cost: 1 Bytes: 12 Cardinality: 1
22 INDEX UNIQUE SCAN INDEX (UNIQUE) AR.RA_CUSTOMER_TRX_U1 Cost: 1 Cardinality: 1
45 NESTED LOOPS Cost: 4,160 Bytes: 25,296 Cardinality: 204
42 NESTED LOOPS Cost: 4,150 Bytes: 23,052 Cardinality: 204
38 NESTED LOOPS Cost: 4,140 Bytes: 19,992 Cardinality: 204
34 NESTED LOOPS Cost: 4,094 Bytes: 75,850 Cardinality: 925
30 NESTED LOOPS Cost: 3,909 Bytes: 210,843 Cardinality: 3,699
26 PARTITION LIST ALL Cost: 2,436 Bytes: 338,491 Cardinality: 14,717 Partition #: 29 Partitions accessed #1 - #18
25 TABLE ACCESS BY LOCAL INDEX ROWID TABLE XLA.XLA_AE_HEADERS Cost: 2,436 Bytes: 338,491 Cardinality: 14,717 Partition #: 29 Partitions accessed #1 - #18
24 INDEX SKIP SCAN INDEX XLA.XLA_AE_HEADERS_N1 Cost: 264 Cardinality: 1,398,115 Partition #: 29 Partitions accessed #1 - #18
29 PARTITION LIST ITERATOR Cost: 1 Bytes: 34 Cardinality: 1 Partition #: 32
28 TABLE ACCESS BY LOCAL INDEX ROWID TABLE XLA.XLA_AE_LINES Cost: 1 Bytes: 34 Cardinality: 1 Partition #: 32
27 INDEX RANGE SCAN INDEX (UNIQUE) XLA.XLA_AE_LINES_U1 Cost: 1 Cardinality: 1 Partition #: 32
33 PARTITION LIST ITERATOR Cost: 1 Bytes: 25 Cardinality: 1 Partition #: 35
32 TABLE ACCESS BY LOCAL INDEX ROWID TABLE XLA.XLA_DISTRIBUTION_LINKS Cost: 1 Bytes: 25 Cardinality: 1 Partition #: 35
31 INDEX RANGE SCAN INDEX XLA.XLA_DISTRIBUTION_LINKS_N3 Cost: 1 Cardinality: 1 Partition #: 35
37 PARTITION LIST SINGLE Cost: 1 Bytes: 16 Cardinality: 1 Partition #: 38
36 TABLE ACCESS BY LOCAL INDEX ROWID TABLE XLA.XLA_EVENTS Cost: 1 Bytes: 16 Cardinality: 1 Partition #: 39 Partitions accessed #2
35 INDEX UNIQUE SCAN INDEX (UNIQUE) XLA.XLA_EVENTS_U1 Cost: 1 Cardinality: 1 Partition #: 40 Partitions accessed #2
41 PARTITION LIST SINGLE Cost: 1 Bytes: 15 Cardinality: 1 Partition #: 41
40 TABLE ACCESS BY LOCAL INDEX ROWID TABLE XLA.XLA_TRANSACTION_ENTITIES Cost: 1 Bytes: 15 Cardinality: 1 Partition #: 42 Partitions accessed #2
39 INDEX UNIQUE SCAN INDEX (UNIQUE) XLA.XLA_TRANSACTION_ENTITIES_U1 Cost: 1 Cardinality: 1 Partition #: 43 Partitions accessed #2
44 TABLE ACCESS BY INDEX ROWID TABLE GL.GL_CODE_COMBINATIONS Cost: 1 Bytes: 11 Cardinality: 1
43 INDEX UNIQUE SCAN INDEX (UNIQUE) GL.GL_CODE_COMBINATIONS_U1 Cost: 1 Cardinality: 1damorgan wrote:
Tuning is NOT about reducing the cost of i/o.
i/o is only one of many contributors to cost and only one of many contributors to waits.
Any time you would like to explore this further run this code:
SELECT 1 FROM dual
WHERE regexp_like(' ','^*[ ]*a');but not on a production box because you are going to experience an extreme tuning event with zero i/o.
And when I say "extreme" I mean "EXTREME!"
You've been warned.I think you just need a faster server.
SQL> set autotrace traceonly statistics
SQL> set timing on
SQL> select 1 from dual
2 where
3 regexp_like (' ','^*[ ]*a');
no rows selected
Elapsed: 00:00:00.00
Statistics
1 recursive calls
0 db block gets
0 consistent gets
0 physical reads
0 redo size
243 bytes sent via SQL*Net to client
349 bytes received via SQL*Net from client
1 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
0 rows processedRepeated from an Oracle 10.2.0.x instance:
SQL> SELECT DISTINCT SID FROM V$MYSTAT;
SID
310
SQL> ALTER SESSION SET EVENTS '10053 TRACE NAME CONTEXT FOREVER, LEVEL 1';
Session altered.
SQL> select 1 from dual
2 where
3 regexp_like (' ','^*[ ]*a');The session is hung. Wait a little while and connect to the database using a different session:
COLUMN STAT_NAME FORMAT A35 TRU
SET PAGESIZE 200
SELECT
STAT_NAME,
VALUE
FROM
V$SESS_TIME_MODEL
WHERE
SID=310;
STAT_NAME VALUE
DB time 9247
DB CPU 9247
background elapsed time 0
background cpu time 0
sequence load elapsed time 0
parse time elapsed 6374
hard parse elapsed time 5997
sql execute elapsed time 2939
connection management call elapsed 1660
failed parse elapsed time 0
failed parse (out of shared memory) 0
hard parse (sharing criteria) elaps 0
hard parse (bind mismatch) elapsed 0
PL/SQL execution elapsed time 95
inbound PL/SQL rpc elapsed time 0
PL/SQL compilation elapsed time 0
Java execution elapsed time 0
repeated bind elapsed time 48
RMAN cpu time (backup/restore) 0Seems to be using a bit of time for the hard parse (hard parse elapsed time). Wait a little while, then re-execute the query:
STAT_NAME VALUE
DB time 9247
DB CPU 9247
background elapsed time 0
background cpu time 0
sequence load elapsed time 0
parse time elapsed 6374
hard parse elapsed time 5997
sql execute elapsed time 2939
connection management call elapsed 1660
failed parse elapsed time 0
failed parse (out of shared memory) 0
hard parse (sharing criteria) elaps 0
hard parse (bind mismatch) elapsed 0
PL/SQL execution elapsed time 95
inbound PL/SQL rpc elapsed time 0
PL/SQL compilation elapsed time 0
Java execution elapsed time 0
repeated bind elapsed time 48
RMAN cpu time (backup/restore) 0The session is not reporting additional CPU usage or parse time.
Let's check one of the session's statistics:
SELECT
SS.VALUE
FROM
V$SESSTAT SS,
V$STATNAME SN
WHERE
SN.NAME='consistent gets'
AND SN.STATISTIC#=SS.STATISTIC#
AND SS.SID=310;
VALUE
163Not many consistent gets after 20+ minutes.
Let's take a look at the plan:
SQL> SELECT SQL_ID,CHILD_NUMBER FROM V$SQL WHERE SQL_TEXT LIKE 'select 1 from du
al%';
SQL_ID CHILD_NUMBER
04mpgrzhsv72w 0
SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR('04mpgrzhsv72w',0,'TYPICAL'))
select 1 from dual where regexp_like (' ','^*[ ]*a')
NOTE: cannot fetch plan for SQL_ID: 04mpgrzhsv72w, CHILD_NUMBER: 0
Please verify value of SQL_ID and CHILD_NUMBER;
It could also be that the plan is no longer in cursor cache (check v$sql_p
lan)No plan...
Let's take a look at the 10053 trace file:
Registered qb: SEL$1 0x19157f38 (PARSER)
signature (): qb_name=SEL$1 nbfros=1 flg=0
fro(0): flg=4 objn=258 hint_alias="DUAL"@"SEL$1"
Predicate Move-Around (PM)
PM: Considering predicate move-around in SEL$1 (#0).
PM: Checking validity of predicate move-around in SEL$1 (#0).
CBQT: Validity checks failed for 7uqx4guu04x3g.
CVM: Considering view merge in query block SEL$1 (#0)
CBQT: Validity checks failed for 7uqx4guu04x3g.
Subquery Unnest
SU: Considering subquery unnesting in query block SEL$1 (#0)
Set-Join Conversion (SJC)
SJC: Considering set-join conversion in SEL$1 (#0).
Predicate Move-Around (PM)
PM: Considering predicate move-around in SEL$1 (#0).
PM: Checking validity of predicate move-around in SEL$1 (#0).
PM: PM bypassed: Outer query contains no views.
FPD: Considering simple filter push in SEL$1 (#0)
FPD: Current where clause predicates in SEL$1 (#0) :
REGEXP_LIKE (' ','^*[ ]*a')
kkogcp: try to generate transitive predicate from check constraints for SEL$1 (#0)
predicates with check contraints: REGEXP_LIKE (' ','^*[ ]*a')
after transitive predicate generation: REGEXP_LIKE (' ','^*[ ]*a')
finally: REGEXP_LIKE (' ','^*[ ]*a')
apadrv-start: call(in-use=592, alloc=16344), compile(in-use=37448, alloc=42256)
kkoqbc-start
: call(in-use=592, alloc=16344), compile(in-use=38336, alloc=42256)
kkoqbc-subheap (create addr=000000001915C238)Looks like the query never had a chance to start executing - it is still parsing after 20 minutes.
I am not sure that this is a good example - the query either executes very fast, or never has a chance to start executing. But, it might still make your point physical I/O is not always the problem when performance problems are experienced.
Charles Hooper
IT Manager/Oracle DBA
K&M Machine-Fabricating, Inc. -
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
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How to get the total execution time from a tkprof file
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. The sample of tkprof is given below.
SQL ID: gg52tq1ajzy7t Plan Hash: 3406052038
SELECT POSTED_FLAG
FROM
AP_INVOICE_PAYMENTS WHERE CHECK_ID = :B1 UNION ALL SELECT POSTED_FLAG FROM
AP_PAYMENT_HISTORY APH, AP_SYSTEM_PARAMETERS ASP WHERE CHECK_ID = :B1 AND
NVL(APH.ORG_ID, -99) = NVL(ASP.ORG_ID, -99) AND
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APH.TRANSACTION_TYPE IN ('PAYMENT CLEARING', 'PAYMENT UNCLEARING')))
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 442 0.08 0.13 0 0 0 0
Fetch 963 0.22 4.72 350 16955 0 521
total 1406 0.31 4.85 350 16955 0 521
Misses in library cache during parse: 1
Optimizer mode: ALL_ROWS
Parsing user id: 173 (recursive depth: 1)
Number of plan statistics captured: 1
Rows (1st) Rows (avg) Rows (max) Row Source Operation
1 1 1 UNION-ALL (cr=38 pr=3 pw=0 time=139 us)
1 1 1 TABLE ACCESS BY INDEX ROWID AP_INVOICE_PAYMENTS_ALL (cr=5 pr=0 pw=0 time=124 us cost=6 size=12 card=1)
1 1 1 INDEX RANGE SCAN AP_INVOICE_PAYMENTS_N2 (cr=4 pr=0 pw=0 time=92 us cost=3 size=0 card=70)(object id 27741)
0 0 0 NESTED LOOPS (cr=33 pr=3 pw=0 time=20897 us)
0 0 0 NESTED LOOPS (cr=33 pr=3 pw=0 time=20891 us cost=12 size=41 card=1)
1 1 1 TABLE ACCESS FULL AP_SYSTEM_PARAMETERS_ALL (cr=30 pr=0 pw=0 time=313 us cost=9 size=11 card=1)
0 0 0 INDEX RANGE SCAN AP_PAYMENT_HISTORY_N1 (cr=3 pr=3 pw=0 time=20568 us cost=2 size=0 card=1)(object id 27834)
0 0 0 TABLE ACCESS BY INDEX ROWID AP_PAYMENT_HISTORY_ALL (cr=0 pr=0 pw=0 time=0 us cost=3 size=30 card=1)
Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
---------------------------------------- Waited ---------- ------------
db file sequential read 350 0.15 4.33
Disk file operations I/O 3 0.00 0.00
latch: shared pool 1 0.17 0.17
********************************************************************************user13019948 wrote:
Hi,
I have a tkprof file. How can I get the total execution time.
call count cpu elapsed disk query current rows
total 1406 0.31 4.85 350 16955 0 521TOTAL ELAPSED TIME is 4.85 seconds from line above -
Changing execution times from recompile in 8.20
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How to get the BPEL instances execution time from dehydration db by query
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Query execution time estimation....
Hi All,
Is it possible to estimate query execution time using explain plan?
Thanks in advance,
Santosh.The cost estimated by the cost based optimizer is actually representing the time it takes to process the statement expressed in units of the single block read-time. Which means if you know the estimated time a single block read request requires you can translate this into an actual time.
Starting with Oracle 9i this information (the time to perform single block/multi block read requests) is actually available if you gather system statistics.
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Of course the time estimates shown by Oracle 10g may not even be close to the actual execution time as it is only an estimate based on a model and input values (statistics) and therefore might be way off due to several reasons, the same applies in principle to the cost shown.
Regards,
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http://oracle-randolf.blogspot.com/
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http://www.sqltools-plusplus.org:7676/
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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,
SigcleThe 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 -
How can i paste the explain plan from toad..
Hello all
I tried taking a snap of the explain plan from toad but in this forum the paste option is disabled...please help964145 wrote:
I tried taking a snap of the explain plan from toad but in this forum the paste option is disabled...please helpI don't know, but it is a waste of time since explain plans from Toad are not useful.
Please read the forum FAQ on providing information for a tuning request, it describes how to generate an explain plan that can be shared.
{message:id=9360003}
This is an example.
SQL> explain plan for
2 select * from dual;
Explained.
SQL> select * from table(dbms_xplan.display);
PLAN_TABLE_OUTPUT
Plan hash value: 3543395131
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 2 | 2 (0)| 00:00:01 |
| 1 | TABLE ACCESS FULL| DUAL | 1 | 2 | 2 (0)| 00:00:01 |
-------------------------------------------------------------------------- -
Explain plan generating it self taking very long time !!! What to do ?
Hi,
I am trying to generate explain plan for a query which is running more than 2 hours. I am trying to generate explain plan for query by "explin plan for select ..." but it self is taking very long time.
Kindly suggest me how to reduce time for explain plan ? Secondly why explain plan itself taking very long time ?
thanks & regards
PKPJust guessing here, but I've experienced this behaviour when I did two explain's within a second. This is because a plan is identified by a statement_id or, if you don't provide a statement_id, by the timestamp (of DATE datatype). So if you execute two explain plans within the second (using a script), it has two sets of data with the same primary key. The hierarchical query that needs to be executed to provide you the nicely indented text, will exponentially expand in this case.
Maybe time to clean up your plan_table ?
Hope this helps.
Regards,
Rob. -
Query regarding Partition table Explain plan
Hello,
We are amidst a tuning activity, wherein a large table has been partitioned for better administration. During testing, I was analyzing the explain plans for long running sql's and found a piece that I was unable to understand. The PSTART and PSTOP columns show ROWID as its value, which in normal partition pruning scenario be the Partition number or the KEY. I tried to look around for this issue but did not get enough information. Can anybody help me of what it means? Also, if there is a good explanation of the same, it will be extremely helpful.
The snippet from explain plan looks like:
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time | Pstart| Pstop |
7 | TABLE ACCESS BY GLOBAL INDEX ROWID| XXXXXXXXXXXXXXXXXXXX | 43874 | 9083K| | 1386 (1)| 00:00:17 | ROWID | ROWID |
On another similar query it looks like:
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time | Pstart| Pstop |
| 6 | TABLE ACCESS BY GLOBAL INDEX ROWID| XXXXXXXXXXXXXX | 22455 | 4648K| | 456 (1)| 00:00:06 | 9 | 9 |
I have another query with regards to the Partition tables. Does it, require/benefit if, the Indexes to be in partitioned mode? I tried to read about it but did not get a conclusive evidence. I am trying to test it and post here the outcome, but if anybody has experience of working with it, it would be great to have some advice.
Oracle Version:- 10.2.0.4
Regards,
Purvesh.Hi Purvesh.
Great explanation and example on this this topic...
Ask Tom "explain plan on range-partitioned table"
Hope this help. -
Explain plan different with no stats but with no rows & rows in a table
Hi All,
This is in Oracle 8.1.7.4.0 DB.
1. Query was taking long time to return rows. It was based on a view.
2. View has multiple tables.
3. The explain plan was showing one of the Table(e.g. TABLE1) using incorrect INDEX. At the time of explain plan table has no statistics.
4. truncated Table TABLE1
5. The explain plan now taking correct INDEX for the table TABLE1.
How does optimizer choosing the incorrect index when rows in a table & correct index when there are no rows in the table ?
any insights.
Thanks
SandeepI don't know about your particular db version, but CBO in absence of statistics uses some default values (e.g. average row length 100 bytes) and also uses actual number of block for the table. I assume something similar might be for indexes.
To be sure what has changed you can run 10053 level trace.
Gints Plivna
http://www.gplivna.eu -
Explain plan--Object not found error
Hi All,
I want to use 'explain plan' to optimise the query.
How do i see the explain plan in toad.
when i say
explain plan set statement_id='XX' for select stmt;
select * from explain plan
where statement_id='XX';
iam geeting object not found
what parameters i need to set up before using explain plan
Please give me details.
Please suggest.
Thanks.This should have been in TOAD Forum :-)).. Anyway,
You need to set the plan table name in view->Options->Oracle. If the specified plan table doesnt exist, create the plan table -
Hi All,
I am trying to know the most used queries in our BI system by trying to find out how many times the query has been executed.
we recently upgraded our BI system and I could find the number of times query has been executed by opening this report SAP_BW_QUERY - No.of Executions per BI Application Object.
The problem is that it is showing me the most used reports after upgrade and I would like to know from the last 6 months or 1 year.
I have checked from the old BW statistics multiprovider and they are couple of reports there but none of the reports shows Execution times of queries.
I checked from ST03N and it I got information for only Query runtime.
could someone let me know which report is related to number or execution times from old BW statistics.
thanksHi,
Once see no.of Navigations, it is nothing but no of times executed. once check in that queries which allready developed.
Regards
Pcrao. -
Hi, good day to all! Is there any way on how to capture an
execution time of a cfm instruction? I have two situations, but I
think they're similar as shown below:
1st situation:
<!--- start query --->
<cfquery name = "q1" datasource="#db#">
SQL statement
</cfquery>
<cfquery name = "q2" datasource="#db#">
SQL statement
</cfquery>
<cfquery name = "q3" datasource="#db#">
SQL statement
</cfquery>
<cfquery name = "q4" datasource="#db#">
SQL statement
</cfquery>
<!--- end query --->
For the 1st situation above, I want to capture the total
execution time from q1 to q3 only. Also, I want to get the time
each query is executed. Is there any way how?
2nd situation (could be any cfml instructions):
<!--- start cfml --->
instruction 1............................
instruction 2............................
instruction 3............................
instruction 4............................
<!--- end cfml --->
In the 2nd situation, I want to get the total execution time
from instruction 1 to instruction 3 only.
Any help is really appreciated. Thanks.
Update ----------------------------------------
By the way, I am using cf 6.1. It seems the gettickcount
technique isn't returning the exact execution time. actually, i
have a code in cf that contains a vbscript. that writes to an excel
file. This is what i did:
start:
..... cf tags here ...
<cfset startTimer = GetTickCount()>
<script language="vbscript">
--- some vbscript and cf statements .........
<cfoutput query = "some_query">
objXL.ActiveSheet.Cells(X_Pos,1).Value = "#some_cf_value#"
objXL.ActiveSheet.Cells(X_Pos,1).Font.size = "#FSize#"
--- some vbscript and cf statements .........
</cfoutput>
--- some vbscript and cf statements .........
</script>
<cfset endTimer = GetTickCount()>
<cfset totalTime_ms = endTimer - startTimer >
end:
totalTime_ms doesn't seem to return the exact length of time
of the process. I mean, From one test, I tried to use a stopwatch
and found out it took about 30 seconds to complete filling the
excel file. But totalTime_ms returns only about 1500 ms, which is
only about 1.5 seconds. The result is far from reality. Why? Is
there any other way? Thanks.if you wanna know the execution time of the whole page, here
is coding..
put this
<cfset tickBegin = GetTickCount()> on the top row of ur
page.
put this
<cfset tickEnd = GetTickCount()>
<cfset loopTime = tickEnd - tickBegin>
<cfset loopTime = loopTime / 1000>
<cfoutput>Messages Results #count_first# - #count_end#
of about #ListLen(session.topic_replies_list)# for seconds
milliseconds. (#loopTime# seconds)</cfoutput>
at the bottom row of ur page.
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