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Date: Sun, 19 Nov 2017 11:46:56 +0100 (CET)
From: Stefan Koehler <contact@soocs.de>
To: Amir.Hameed@xerox.com, ORACLE-L <oracle-l@freelists.org>
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Subject: Re: UPDATE statement - cpu and elapsed time almost the same
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Hey Amir,
not quite sure what you have traced but the data between parsed extended SQ=
L trace output and execution plan does not fit.

You have 4 EXEC OPI calls with 646/261 logical I/Os and 30 rows but your po=
sted execution plan already has 2335 logical I/Os by 4 starts.

The problem is that Oracle does not provide any CPU break-down information =
in OPI call tracing or the execution plan - so basically you have to check =
session statistics (if there is any hint) or profile the shadow process.

I had a talk about this and you might find this interesting: http://www.soo=
cs.de/public/talk/160616_DOAG_Regio_NUE_Identifying_Performance_Issues_Beyo=
nd_The_Oracle_Wait_Interface_PPT.pdf

Page 5 describes the general approach (you are basically at point 3 from no=
w on) and the other slides include various tools for profiling.

Best Regards
Stefan Koehler

Independent Oracle performance consultant and researcher
Website: http://www.soocs.de
Twitter: @OracleSK

>"Hameed, Amir" <Amir.Hameed@xerox.com> hat am 18. November 2017 um 02:50 g=
eschrieben:
>=20
> Hi,
>=20
> We traced an Oracle EBS Order Import form which was taking time to import=
 orders. The trace file showed multiple UPDATE statements that were consumi=
ng time. What was common in all those statements was that their cpu time wa=
s almost the same as their elapsed time. I am pasting one of the statements=
, its statistics and explain plan. The explain plan seems to indicate that =
operation 1, which was executed 4 times, took most of the time. Was the tim=
e spent in this operation was due to the number of buffers processed which =
is memory operation and that is the reason cpu statistic was high? The colu=
mns being updated is indexed via a single-column index.
>=20
> UPDATE OE_ORDER_LINES OEOPT SET ATO_LINE_ID =3D ( SELECT LINE_ID FROM
>=20
> =C2=A0 OE_ORDER_LINES OEATO
>=20
> WHERE
>=20
> OEOPT.TOP_MODEL_LINE_ID =3D OEATO.TOP_MODEL_LINE_ID AND OEATO.CONFIGURATI=
ON_ID
>=20
> =C2=A0 =3D (SELECT ATO_CONFIG_ITEM_ID FROM CZ_CONFIG_DETAILS_V WHERE CONF=
IG_HDR_ID =3D
>=20
> =C2=A0 OEOPT.CONFIG_HEADER_ID AND CONFIG_REV_NBR =3D OEOPT.CONFIG_REV_NBR=
 AND
>=20
> =C2=A0 CONFIG_ITEM_ID =3D OEOPT.CONFIGURATION_ID) AND OEATO.OPEN_FLAG =3D=
 'Y' ) WHERE
>=20
> =C2=A0 TOP_MODEL_LINE_ID =3D :B1 AND NOT (ITEM_TYPE_CODE =3D 'OPTION' AND=
 ATO_LINE_ID =3D
>=20
> =C2=A0=C2=A0 LINE_ID AND ATO_LINE_ID IS NOT NULL) AND NOT (ITEM_TYPE_CODE=
 =3D 'INCLUDED'
>=20
> =C2=A0 AND ATO_LINE_ID =3D LINE_ID AND ATO_LINE_ID IS NOT NULL) AND ITEM_=
TYPE_CODE
>=20
> =C2=A0 <> 'CONFIG' AND (NVL(MODEL_REMNANT_FLAG, 'N') =3D 'N' OR LINE_CATE=
GORY_CODE =3D
>=20
> =C2=A0 'RETURN') AND ORDERED_QUANTITY > 0
>=20
> call=C2=A0=C2=A0=C2=A0=C2=A0 count=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 cp=
u=C2=A0=C2=A0=C2=A0 elapsed=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 disk=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 query=C2=A0=C2=A0=C2=A0 current=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 rows
>=20
> ------- ------=C2=A0 -------- ---------- ---------- ---------- ----------=
=C2=A0 ----------
>=20
> Parse=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 1=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 0.00=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0.00=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0
>=20
> Execute=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 4=C2=A0=C2=A0=C2=A0 174.74=C2=A0=C2=
=A0=C2=A0=C2=A0 174.86=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 646=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 261=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 30
>=20
> Fetch=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 0.00=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0.00=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0
>=20
> ------- ------=C2=A0 -------- ---------- ---------- ---------- ----------=
=C2=A0 ----------
>=20
> total=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 5=C2=A0=C2=A0=C2=A0 174.7=
4=C2=A0=C2=A0=C2=A0=C2=A0 174.86=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 646=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 261=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 30
>=20
> -------------------------------------------------------------------------=
---------------------------------------------------------------------------=
-
>=20
> | Id=C2=A0 | Operation=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 | Name=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | Starts | E-Rows |E=
-Bytes| Cost (%CPU)| E-Time=C2=A0=C2=A0 | A-Rows |=C2=A0=C2=A0 A-Time=C2=A0=
=C2=A0 | Buffers |
>=20
> -------------------------------------------------------------------------=
---------------------------------------------------------------------------=
-
>=20
> |=C2=A0=C2=A0 0 | UPDATE STATEMENT=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 0 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0 12 (100)|=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0 |00:00:00.01 |=
=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A00 |
>=20
> |=C2=A0=C2=A0 1 |=C2=A0 UPDATE=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 | OE_ORDER_LINES_ALL=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 4 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0 |00:02:54.91 |=C2=
=A0=C2=A0=C2=A0 2335 |
>=20
> |*=C2=A0 2 |=C2=A0=C2=A0 TABLE ACCESS BY INDEX ROWID=C2=A0=C2=A0 | OE_ORD=
ER_LINES_ALL=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
4 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 1 |=C2=A0=C2=A0 454 |=C2=A0=C2=A0=C2=A0=
=C2=A0 5=C2=A0=C2=A0 (0)| 00:00:01 |=C2=A0=C2=A0=C2=A0=C2=A0 30 |00:00:00.0=
1 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 60 |
>=20
> |*=C2=A0 3 |=C2=A0=C2=A0=C2=A0 INDEX RANGE SCAN=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | OE_ORDER_LINES_N10=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 4 |=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 9 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=
=C2=A0 1=C2=A0=C2=A0 (0)| 00:00:01 |=C2=A0=C2=A0=C2=A0=C2=A0 30 |00:00:00.0=
1 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 8 |
>=20
> |*=C2=A0 4 |=C2=A0=C2=A0 FILTER=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0 30 |=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0 26 |00:00:00.01=
 |=C2=A0=C2=A0=C2=A0=C2=A0 584 |
>=20
> |*=C2=A0 5 |=C2=A0=C2=A0=C2=A0 TABLE ACCESS BY INDEX ROWID=C2=A0 | OE_ORD=
ER_LINES_ALL=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0|=C2=A0=C2=A0=C2=A0=C2=A0 30 |=
=C2=A0=C2=A0=C2=A0 229 |=C2=A0 3664 |=C2=A0=C2=A0=C2=A0=C2=A0 6=C2=A0=C2=A0=
 (0)| 00:00:01 |=C2=A0=C2=A0=C2=A0 226 |00:00:00.01 |=C2=A0=C2=A0=C2=A0=C2=
=A0 382 |
>=20
> |*=C2=A0 6 |=C2=A0=C2=A0=C2=A0=C2=A0 INDEX RANGE SCAN=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | OE_ORDER_LINES_N10=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0 30 |=C2=A0=C2=A0=C2=A0=
=C2=A0 11 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0 1=
=C2=A0=C2=A0 (0)| 00:00:01 |=C2=A0=C2=A0=C2=A0 226 |00:00:00.01 |=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 50 |
>=20
> |=C2=A0=C2=A0 7 |=C2=A0=C2=A0=C2=A0 NESTED LOOPS OUTER=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0 30 |=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 1 |=C2=A0=C2=A0 310 |=C2=A0=C2=A0=C2=A0=C2=A0 0=
=C2=A0=C2=A0 (0)|=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=
=C2=A0=C2=A0=C2=A0=C2=A0 30 |00:00:00.01 |=C2=A0=C2=A0=C2=A0=C2=A0 202 |
>=20
> |=C2=A0=C2=A0 8 |=C2=A0=C2=A0=C2=A0=C2=A0 NESTED LOOPS=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=
=A0=C2=A0=C2=A0=C2=A0 30 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 1 |=C2=A0=C2=A0 14=
9 |=C2=A0=C2=A0=C2=A0=C2=A0 0=C2=A0=C2=A0 (0)|=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0 30 |00:00:00.01 |=C2=
=A0=C2=A0=C2=A0=C2=A0 172 |
>=20
> |*=C2=A0 9 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 TABLE ACCESS BY INDEX ROWID| C=
Z_CONFIG_ITEMS=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=
=A0=C2=A0=C2=A0 30 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 1 |=C2=A0=C2=A0 108 |=C2=
=A0=C2=A0=C2=A0=C2=A0 0=C2=A0=C2=A0 (0)|=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0 30 |00:00:00.01 |=C2=A0=C2=
=A0=C2=A0=C2=A0 112 |
>=20
> |* 10 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 INDEX RANGE SCAN=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | CZ_CONFIG_ITEMS_N1=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0 30 |=C2=A0=C2=A0=C2=A0 =C2=A0=
=C2=A01 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0 0=
=C2=A0=C2=A0 (0)|=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=
=C2=A0=C2=A0=C2=A0 256 |00:00:00.01 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 50 |
>=20
> |* 11 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 TABLE ACCESS BY INDEX ROWID| CZ_CON=
FIG_HDRS=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=
=A0=C2=A0=C2=A0 30 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 1 |=C2=A0=C2=A0=C2=A0 41=
 |=C2=A0=C2=A0=C2=A0=C2=A0 0=C2=A0=C2=A0 (0)|=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0 30 |00:00:00.01 |=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 60 |
>=20
> |* 12 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 INDEX UNIQUE SCAN=C2=A0=C2=A0=
=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0| CZ_CONFIG_HDRS_PK=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0 30 |=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 1 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0 0=
=C2=A0=C2=A0 (0)|=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=
=C2=A0=C2=A0=C2=A0=C2=A0 30 |00:00:00.01 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 30=
 |
>=20
> |* 13 |=C2=A0=C2=A0=C2=A0=C2=A0 INDEX UNIQUE SCAN=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | CZ_CONFIG_ATTRIBUTES_PK |=C2=A0=C2=
=A0=C2=A0=C2=A0 30 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 1 |=C2=A0=C2=A0 161 |=C2=
=A0=C2=A0=C2=A0=C2=A0 0=C2=A0=C2=A0 (0)|=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0 |00:00:00.01 |=C2=
=A0=C2=A0 =C2=A0=C2=A0=C2=A030 |
>
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