Extreme slowdown of update statement
- From: Vladimir Barac <vbarac@xxxxxxxxxxxx>
- To: "oracle-l@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>
- Date: Sun, 28 Dec 2008 22:30:04 +0300
Hi, listers
Oracle EE 10.2.0.4 64bit, Linux
We have some update statement (part of PL/SQL procedure) that may run for less
than a minute if executed from SQL*Plus prompt or may take ~30 minutes if
executed as a DBMS_SCHEDULER scheduled job. TKPROF output is pasted below.
What could be the reason for this behaviour? Is there some "slowdown" imposed
by DBMS_SCHEDULER?
All insights are welcomed,
Vladimir Barac
********************************************************************************
UPDATE /*+ no_parallel(x) */ ELE_PRODUCT X SET X.FIRST_FOB_PRICE =(SELECT
MAX(D.UNIT_PRICE) FROM ELEC_PO_ORDER_DETAILS D,ELEC_PO E,(SELECT
MIN(B.DATE_CREATED) MIN_DATE,MAX(B.DATE_CREATED) MAX_DATE,A.ITEM_NO FROM
ELEC_PO_ORDER_DETAILS A,ELEC_PO B
WHERE
A.COMP_CODE=B.COMP_CODE AND A.PO_NO=B.PO_NO GROUP BY ITEM_NO) C WHERE
D.COMP_CODE=E.COMP_CODE AND D.PO_NO=E.PO_NO AND E.DATE_CREATED = C.MIN_DATE
AND D.ITEM_NO = X.ITEM_CODE AND C.ITEM_NO = X.ITEM_CODE)
call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ---------- ----------
Parse 1 0.06 0.07 1 432 0 0
Execute 1 1747.92 1732.64 209 753991 120144 54039
Fetch 0 0.00 0.00 0 0 0 0
------- ------ -------- ---------- ---------- ---------- ---------- ----------
total 2 1747.98 1732.72 210 754423 120144 54039
Misses in library cache during parse: 1
Optimizer mode: ALL_ROWS
Parsing user id: 24 (DM_ELEC_MANAGER) (recursive depth: 2)
Rows Execution Plan
------- ---------------------------------------------------
0 UPDATE STATEMENT MODE: ALL_ROWS
0 UPDATE OF 'ELE_PRODUCT'
0 TABLE ACCESS MODE: ANALYZED (FULL) OF 'ELE_PRODUCT' (TABLE)
0 SORT (AGGREGATE)
0 HASH JOIN
0 NESTED LOOPS
0 VIEW
0 SORT (GROUP BY)
0 NESTED LOOPS
0 INDEX MODE: ANALYZED (RANGE SCAN) OF
'ELEC_PO_ORDER_DETAILS1' (INDEX)
0 INDEX MODE: ANALYZED (RANGE SCAN) OF
'CUST_ELEC_PO01' (INDEX)
0 INDEX MODE: ANALYZED (RANGE SCAN) OF 'ELEC_PO2' (INDEX)
0 INDEX MODE: ANALYZED (RANGE SCAN) OF
'ELEC_PO_ORDER_DETAILS1' (INDEX)
Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
---------------------------------------- Waited ---------- ------------
db file sequential read 209 0.10 1.45
log file switch completion 4 0.09 0.18
log buffer space 5 0.25 0.74
********************************************************************************
********************************************************************************
UPDATE /*+ no_parallel(x) */ ELE_PRODUCT X SET X.FIRST_FOB_PRICE =(SELECT
MAX(D.UNIT_PRICE) FROM ELEC_PO_ORDER_DETAILS D,ELEC_PO E,(SELECT
MIN(B.DATE_CREATED) MIN_DATE,MAX(B.DATE_CREATED) MAX_DATE,A.ITEM_NO FROM
ELEC_PO_ORDER_DETAILS A,ELEC_PO B
WHERE
A.COMP_CODE=B.COMP_CODE AND A.PO_NO=B.PO_NO GROUP BY ITEM_NO) C WHERE
D.COMP_CODE=E.COMP_CODE AND D.PO_NO=E.PO_NO AND E.DATE_CREATED = C.MIN_DATE
AND D.ITEM_NO = X.ITEM_CODE AND C.ITEM_NO = X.ITEM_CODE)
call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ---------- ----------
Parse 1 0.05 0.22 2 432 0 0
Execute 1 28.68 28.62 0 743780 119906 54039
Fetch 0 0.00 0.00 0 0 0 0
------- ------ -------- ---------- ---------- ---------- ---------- ----------
total 2 28.73 28.84 2 744212 119906 54039
Misses in library cache during parse: 1
Optimizer mode: ALL_ROWS
Parsing user id: 24 (DM_ELEC_MANAGER) (recursive depth: 1)
Rows Execution Plan
------- ---------------------------------------------------
0 UPDATE STATEMENT MODE: ALL_ROWS
0 UPDATE OF 'ELE_PRODUCT'
0 TABLE ACCESS MODE: ANALYZED (FULL) OF 'ELE_PRODUCT' (TABLE)
0 SORT (AGGREGATE)
0 HASH JOIN
0 NESTED LOOPS
0 VIEW
0 SORT (GROUP BY)
0 NESTED LOOPS
0 INDEX MODE: ANALYZED (RANGE SCAN) OF
'ELEC_PO_ORDER_DETAILS1' (INDEX)
0 INDEX MODE: ANALYZED (RANGE SCAN) OF
'CUST_ELEC_PO01' (INDEX)
0 INDEX MODE: ANALYZED (RANGE SCAN) OF 'ELEC_PO2' (INDEX)
0 INDEX MODE: ANALYZED (RANGE SCAN) OF
'ELEC_PO_ORDER_DETAILS1' (INDEX)
********************************************************************************
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