Regarding Performance

Hi All,
I am doing the performance analysis using SE30.
I got the results as follows ::
ABAP - 80%
Database and System - 15%
I understand database should be as low as possible.
I wish to know about the ABAP.
Its 80% so is it good or not good.
What steps can we take to get it down if required.
regards

Hi Sachin,
ABAP 80% denotes the program is too good.
Generally ABAP should have more percentage than SYSTEM and DATABASE.
ABAP 80% denotes you are utilizing application server as 80%.
If helps plz reward points.
Regards
Bhupal Reddy

Similar Messages

Regarding performance optimization and tuning...

hi all,
please provide me the performance tuning scenarios and parameters of an R/3 system with Oracle..
i heartly welcome all docs and pdf links or notes related to this issue..
please provide ur suggestions at the earliest...
expecting ur response..
Vineeth

Hello,
there are many SAP Notes regarding performance issues. Here are just a couple of them:
618868
805934
793113
805934
Please also have a look at the lists of the relating Notes at the end of each Note.
But still much more effective would be to read the book of
<a href="http://www.sap-press.de/katalog/buecher/titel/gp/titelID-1155?GalileoSession=66220888A2.lRCIISlE">T.Schneider Performance Optimization Guide</a>.
It's the best performance tuning guide. The course ADM315 (or BC315?) ist also very helpful.
Regards,
Natalia

Urgent query regarding performance

hi
i have one query regarding performance.iam using interactive reporting and workspace.
i have all the linsence server,shared services,and Bi services and ui services and oracle9i which has metadata installed in one system(one server).data base which stores relationaldata(DB2) on another system.(i.e 2 systems in total).
in order to increase performance i made some adjustments
i installed hyperion BI server services, UI services,license server and shared services server such that all web applications (that used web sphere 5.1) such as shared services and UI services in server1(or computer1).and remaining linsence and bi server services in computer2 and i installed database(db2) on another computer3.(i.e 3 systems in total)
my query : oracle 9i which has metadata where to install that in ( computer 1 or in computer 2 )
i want to get best performance.where to install that oracle 9i which has metadata stored in it.
for any queries please reply mail
[email protected]
9930120470

You should know that executing a query is always slower the first time. Then Oracle can optimise your query and store it temporary for further executions. But passing from 3 minutes to 3 seconds, maybe your original query is really, really slow. Most of the times I only win few milliseconds. If Oracle is able to optimize it to 3 seconds. You must clearly rewrite your query.
Things you should know to enhance your execution time : try to reduce the number of nested loops, nested loops give your an exponential execution time which is really slow :
for rec1 in (select a from b) loop
for rec2 in (select c from d) loop
end loop;
end loop;Anything like that is bad.
Try to avoid Cartesian products by writing the best where clause possible.
select a.a,
b.b
from a,
b
where b.b > 1This is bad and slow.

Regarding Performance Issue

Hi Friends,
i have a FI report, Main Cash Vocher Printing, the report is very slow so to check its performance i have done the SQL Trace in ST05.
in SQL trace i have found all the DB tables used and time taken to execute the select statement.... in that list i also found and Cluster Table RFBLG , but i did not used these cluster table in the program.
and i also found more than 500 entries of Obj.NameRFBLG in that ...
Though its duration is small , ,, can we control that so that my report performance van be increased
its Urgent...
Useful reply will be awarded maximum
Regards
Kumat M

Hi Kumat,
RFBLG is the Cluster table of the logical table BSEG. That means the table BSEG stores its rows in the database table RFBLG. If the access to RFBLG is fast enough, you could ignore those entries and concentrate on red lines in the trace.
Regards
Ralph Ganszky

Regarding Performance pbl in SQL query.

hey guys,
Could somebody help me over this posting.
I have created TAX report. which retrieved records from BSIS and BSAS table to calculate consumption tax.
From SE30 and SQL trace i found that loop at BSIS and BSAS takes round trip
for each Input Period value.
could you please give me best coding alternate to my below coding part.
*Main code--
loop at itab_t001.(itab_t001-bukrs is company code list,for each company code)
WK_MONAT = '01'.
DO.
 IF WK_MONAT = P_MONAT. "p_monat is parameter input for period
 FLG_CUR_PERIOD = CNS_TRUE.
 ENDIF.
 PERFORM FRM_READ_DATA. " RETRIEVE DATA FROM BSIS AND BSAS
 WK_MONAT = WK_MONAT + 1.
 IF WK_MONAT > P_MONAT.
 EXIT.
 ENDIF.
ENDDO.
END of Main code----
 Read FI documents from table BSIS/BSAS
FORM FRM_READ_DATA.
Select data from table BSIS
SELECT BELNR BUZEI BLART MWSKZ HKONT SHKZG DMBTR
 INTO CORRESPONDING FIELDS OF TABLE ITAB_BSIS
 FROM BSIS WHERE BUKRS = itab_t001-BUKRS AND GJAHR = P_GJAHR AND MONAT = WK_MONAT AND
 ( MWSKZ <> ' ' AND MWSKZ <> '**' ).
Select data from table BSAS
SELECT BELNR BUZEI BLART MWSKZ HKONT SHKZG DMBTR
 APPENDING CORRESPONDING FIELDS OF TABLE ITAB_BSIS
 FROM BSAS WHERE BUKRS = itab_t001-BUKRS AND GJAHR = P_GJAHR AND MONAT = WK_MONAT AND
 ( MWSKZ <> ' ' AND MWSKZ <> '**' ).
Select data from table BSIS that includes non-consumption tax accounts
SELECT BELNR
 INTO TABLE ITAB_NO_TAX_DOC
 FROM BSIS WHERE BUKRS = itab_t001-BUKRS AND GJAHR = P_GJAHR AND
 MONAT = WK_MONAT AND HKONT IN S_NT_ACC.
Select data from table BSAS that includes non-consumption tax accounts
SELECT BELNR APPENDING TABLE ITAB_NO_TAX_DOC
 FROM BSAS WHERE BUKRS = itab_t001-BUKRS AND GJAHR = P_GJAHR AND
 MONAT = WK_MONAT AND HKONT IN S_NT_ACC.
...Proceeded with ABOVE fetched internal tables.
ENDFORM.
Note:
I found that BSIS and BSAS table have 10000s of records it takes 3hrs time to run this report(if i give 12months period). (for each month(ie 01month report takes 15minutes to execute.)
so i think instead calling BSiS twice, calling BSIS ones is wise.
could you pls help me how can i modify the code and should i have
to created any index here(if so mention how and which field)
pls feel free to ask if any addition code is required.
could you pls confirm.
ambichan.
Message was edited by: ambi chan

Hi Ambichan,
Few things that can be done to the below code.
1. Dont put select queries inside the "loop at itab_t001....endloop" statement.
Instead use FOR ALL ENTRIES IN itab_t001 for the queries. Then you can use READ stmt to get the values.
NOTE: Make sure that you select all key fields from the databse when using FOR all Entries.
This will avoid hitting of the DB table multiple time.
2. Avoid "INTO CORRESPONDING FIELDS OF TABLE" in select queries. Modify the internal table to suit the strucutre of the databse table.
This will make the query faster
3. Make sure that the fields in the select query are in the same order as that in DB table.
This will also make the query faster
Try these changes and performance should increase.
Regards,
Saji.

Regarding Performance in XI

Hi All,
Q1) How Do we Do the Performance in XI ????
Q2) What we have to do to Improve the Performance in XI ????
Please let me Know
Regards
Vamsi

1. Do u mean Monitor Performance?
U can do this through Runtime Workbench -> performance Monitoring
2. See these
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/489f5844-0c01-0010-79be-acc3b52250fd
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/defd5544-0c01-0010-ba88-fd38caee02f7?prtmode=navigate
/people/prasad.illapani/blog/2007/04/27/performance-tuning-checks-in-sap-exchange-infrastructurexi-part-iii
Regards,
Prateek

Regarding Performance of the Index

Hi all,
Generally Index should increase the performance of the search, but i got the reverse of that when i was accessing the data from a table with and without index.
I have seen that the query performed more faster without index. What is the situation of the data base to perform like this. Can anybody explain.
SQL> set autotrace on explain
SQL> select * from emp where empno = 7934;
     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
      7934 MILLER     CLERK           7782 23-JAN-82       1300                    10
Elapsed: 00:00:00.18
Execution Plan
Plan hash value: 2949544139
| Id | Operation                   | Name   | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT            |        |     1 |    37 |     1   (0)| 00:00:01 |
|   1 | TABLE ACCESS BY INDEX ROWID| EMP    |     1 |    37 |     1   (0)| 00:00:01 |
|* 2 |   INDEX UNIQUE SCAN         | PK_EMP |     1 |       |     0   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   2 - access("EMPNO"=7934)
SQL> alter table emp disable primary key;
Table altered.
Elapsed: 00:00:01.53
SQL> select * from emp where empno = 7934;
     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
      7934 MILLER     CLERK           7782 23-JAN-82       1300                    10
Elapsed: 00:00:00.15
Execution Plan
Plan hash value: 3956160932
| Id | Operation         | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT |      |     1 |    37 |     3   (0)| 00:00:01 |
|* 1 | TABLE ACCESS FULL| EMP |     1 |    37 |     3   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   1 - filter("EMPNO"=7934)Regards,
Sri Ram.
Edited by: Sri Ram on Jun 19, 2011 9:52 PM
Edited by: BluShadow on 20-Jun-2011 10:33
added {noformat}{noformat} tags. 86 posts and you still don't know how to post code/data? Please read {message:id=9360002}

SQL> alter table emp disable primary key;
Table altered.
Elapsed: 00:00:00.15
SQL> select * from emp where empno =7566;
     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
      7566 JONES      MANAGER         7839 02-APR-81       2975                    40
Elapsed: 00:00:00.17
Execution Plan
Plan hash value: 3956160932
| Id | Operation         | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT |      |     1 |    37 |     3   (0)| 00:00:01 |
|* 1 | TABLE ACCESS FULL| EMP |     1 |    37 |     3   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   1 - filter("EMPNO"=7566)
SQL> alter table emp enable primary key;
Table altered.
Elapsed: 00:00:00.14
SQL> select * from emp where empno =7566;
     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
      7566 JONES      MANAGER         7839 02-APR-81       2975                    40
Elapsed: 00:00:00.17
Execution Plan
Plan hash value: 2949544139
| Id | Operation                   | Name   | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT            |        |     1 |    37 |     1   (0)| 00:00:01 |
|   1 | TABLE ACCESS BY INDEX ROWID| EMP    |     1 |    37 |     1   (0)| 00:00:01 |
|* 2 |   INDEX UNIQUE SCAN         | PK_EMP |     1 |       |     0   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   2 - access("EMPNO"=7566)Edited by: BluShadow on 20-Jun-2011 10:34
added more {noformat}{noformat} tags. See, it's really not that difficult, but I'm not going to do it all the time for you.

Regarding Performance issues

Can anybody share pure BI Performance document of DB02, St02,RSRST analysis does purpose.
Can anyone share it., Thanks in advance.

HI,
check below links
http://www.sap-press.de/download/dateien/1049/sappress_bw_performance_optimization_guide_080.pdf
http://wiki.sdn.sap.com/wiki/display/BI/Aggregates--SAPBWQueryPerformance
http://sap.seo-gym.com/performance%20tuning%20for%20queries.pdf
Click on search button in SDN and Google you can find lots of docs
Regards
KP

Regarding performance impact if I do DB accessing coding in comp Controller

Hi ,
This is my project requirement, I have to use some com compoment which in turn fetches data from the database. I am using a java com bridge tool to do this. This tool is generating the java proxy classes for the VB com component.
I am using java proxy classes( This class files are using JNI to connect to VB COM compnent and fetch the data from DB) in my webdynpro component controller.
The architecture is aas below
WEBDYNPRO >> JAVA Classes object( generated by the JAVA- COM bridge tool ) >> JAVA-COM bridge tool >> VB COM+ Component >> SQL server.
The issue
Performance :- first time it is OK but for Consecutive calls the application is going down very visibly and after 4 iteration it hangs . When I look at the log I am getting this
Message : Exception occured during processing of Web Dynpro application com/oreqsrch/com.oreqsrchapp.OReqSrchApp.
The causing exception is nested.
[EXCEPTION]
com.sap.tc.webdynpro.services.session.LockException: Thread SAPEngine_Application_Thread[impl:3]_36 failed to acquire exclusive lock on client session ClientSession(id=(J2EE9536400)ID1120562150DB11245826542790956137End_1159630423). Existing locks: LockingManager(ThreadName:SAPEngine_Application_Thread[impl:3]_36, exclusive client session lock:
ClientSessionLock(SAPEngine_Application_Thread[impl:3]_9), shared client session locks: ClientSessionSharedLockManager([]), app session locks: ApplicationSessionLockManager([]), current request: com/oreqsrch/com.oreqsrchapp.OReqSrchApp).
Hint: Take a thread dump of the server node to find the blocking thread that causes the problem.
Is this issue because I have return the code data access code in the component controller rather wrting in some beans ?
My questions regarding
What would the performance impact if write the DB access code in the webdynpro component controller rather than writing in a bean or an EJB?( I know ideally DB access code has to write in Bean or EJB ).
Please address this with respedct to performance point of view .
thanks
pkiran

Hi Both,
Thanks for the reply.
Yes they are closed and set it to null;
Connection max and mini properties are controlled at COM+ components in VB.
Since I am using COM - JAVA bridge, I am just invoking the methods defined ijn the VB code thru the bridge tool. all the objects which are retrieving the data are closed and nullify it.
My question is
if I write DB access code in component control instead in EJB or Java bean, will there be any performance issue ?
regards
pkiran

Regarding performance issue in time dependent hierarchie.

hai
we are loading time dependent hierarchies from flatfile to bw,it is weekely load,we have nearly one million records loaded,we got an issues regarding change of these hierarchies timely.when ever there occurs a change in hierarchy a new row is added to the table,it is degrading the performance,can any one of you please suggest how to over come performance related issues regarding time dependent hierarchies.
Regards
Srinivas.G

hello deven,
if you are only focusing on your application's performance
on the aspect of usability i.e. less waiting time, fast
response UI, i would personally suggest you to use AJAX.
put some processing part on the browser side and making
data retrieval from MI asynchronous... this way, your user
don't have to wait for all data to be presented, but rather
could work on the data presented in pieces (i.e. asynchronously).
anyway try googling for AJAX...
regards
jo

Regarding Performance It is Urgent.

hi
I have one statement move-corresponding gt_bkpf to post_tab.
In gt_bkpf Internal Table 10 fields are there. Post_tab is another Internal Table.
In performance issue you need to use ASSIGN instead of move-corresponding.
How can i do it. Plz Reply.
Regards
Rami Reddy

Hi!
Field to field assignment means the following:
MOVE: gt_bkpf-bukrs TO post_tab-bukrs,
gt_bkpf-belnr TO post_tab-belnr,
gt_bkpf-gjahr TO post_tab-gjahr.
It's a very little bit faster that move-corresponding, but if you need a new field, you have to code that also, against move-corresponding, which handles it automatically (if their names are identical).
Regards
Tamá

Regarding performance of a report

Hi friends,
In the loop statement I am using modify statement for updating the data in the internal table .
I have to improve the performance of a report.
is there any alternative for Improving teh performance.,
Regards,
Jayan

HI
If u r modifying Ztable no probelm because we will be having small amount of data .
IF u r updating standard table Do like below .
First collect all the records which you want to update to table into one internal table .
Then update the table with that internal table ..
IT will be better when you are updating standard table .
I think this will help you ..
If u r not understood copy paste ur code i can solve ur probelm ...

Regarding Performance Problem

Dear All,
I have
     8 GB Ram
    800 Hard Disk
   itanium2   1.40Ghz
   RAID 5 i.e 146*5
but our sap performance is poor.
is it correct configuration?
please help the how i improve the performance of system.
thanks in advance.
regards,
Abhijeet

Hi,
    Did you scheduled archiving jobs and also fine tuning steps in your PI server
Check this How to guide if not checked already.
http://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/2016a0b1-1780-2b10-97bd-be3ac62214c7
HTH
Rajesh

Regarding performance of report

hi SDNs,
my report is running for more than 30 min and going dumb.
so i am increasing the performance by considering every thing..
putting indexes in select stmts .
while reading ( READ TABLE ) using binary search.
sorting before reading.
thing is still showing, some poor performance..
what to consider inorder to increase the perofrmance?
and here report has to extract huge data ( min 50,000 records )
shall i use HASHED OR SORTED ? how to use these??
i am using STANDARD now ??
pls help me .,
Thanking you,
ramu

hi,
pls go thru this. def this will help
Performance tuning for Data Selection Statement
For all entries
The for all entries creates a where clause, where all the entries in the driver table are combined with OR. If the number of
entries in the driver table is larger than rsdb/max_blocking_factor, several similar SQL statements are executed to limit the
length of the WHERE clause.
The plus
Large amount of data
Mixing processing and reading of data
Fast internal reprocessing of data
Fast
The Minus
Difficult to program/understand
Memory could be critical (use FREE or PACKAGE size)
Some steps that might make FOR ALL ENTRIES more efficient:
Removing duplicates from the the driver table
Sorting the driver table
If possible, convert the data in the driver table to ranges so a BETWEEN statement is used instead of and OR statement:
FOR ALL ENTRIES IN i_tab
WHERE mykey >= i_tab-low and
 mykey <= i_tab-high.
Nested selects
The plus:
Small amount of data
Mixing processing and reading of data
Easy to code - and understand
The minus:
Large amount of data
when mixed processing isnt needed
Performance killer no. 1
Select using JOINS
The plus
Very large amount of data
Similar to Nested selects - when the accesses are planned by the programmer
In some cases the fastest
Not so memory critical
The minus
Very difficult to program/understand
Mixing processing and reading of data not possible
Use the selection criteria
SELECT * FROM SBOOK.
CHECK: SBOOK-CARRID = 'LH' AND
 SBOOK-CONNID = '0400'.
ENDSELECT.
SELECT * FROM SBOOK
WHERE CARRID = 'LH' AND
 CONNID = '0400'.
ENDSELECT.
Use the aggregated functions
C4A = '000'.
SELECT * FROM T100
WHERE SPRSL = 'D' AND
 ARBGB = '00'.
CHECK: T100-MSGNR > C4A.
C4A = T100-MSGNR.
ENDSELECT.
SELECT MAX( MSGNR ) FROM T100 INTO C4A
WHERE SPRSL = 'D' AND
 ARBGB = '00'.
Select with view
SELECT * FROM DD01L
WHERE DOMNAME LIKE 'CHAR%'
 AND AS4LOCAL = 'A'.
SELECT SINGLE * FROM DD01T
 WHERE DOMNAME = DD01L-DOMNAME
 AND AS4LOCAL = 'A'
 AND AS4VERS = DD01L-AS4VERS
 AND DDLANGUAGE = SY-LANGU.
ENDSELECT.
SELECT * FROM DD01V
WHERE DOMNAME LIKE 'CHAR%'
 AND DDLANGUAGE = SY-LANGU.
ENDSELECT.
Select with index support
SELECT * FROM T100
WHERE ARBGB = '00'
 AND MSGNR = '999'.
ENDSELECT.
SELECT * FROM T002.
SELECT * FROM T100
 WHERE SPRSL = T002-SPRAS
 AND ARBGB = '00'
 AND MSGNR = '999'.
ENDSELECT.
ENDSELECT.
Select Into table
REFRESH X006.
SELECT * FROM T006 INTO X006.
APPEND X006.
ENDSELECT
SELECT * FROM T006 INTO TABLE X006.
Select with selection list
SELECT * FROM DD01L
WHERE DOMNAME LIKE 'CHAR%'
 AND AS4LOCAL = 'A'.
ENDSELECT
SELECT DOMNAME FROM DD01L
INTO DD01L-DOMNAME
WHERE DOMNAME LIKE 'CHAR%'
 AND AS4LOCAL = 'A'.
ENDSELECT
Key access to multiple lines
LOOP AT TAB.
CHECK TAB-K = KVAL.
ENDLOOP.
LOOP AT TAB WHERE K = KVAL.
ENDLOOP.
Copying internal tables
REFRESH TAB_DEST.
LOOP AT TAB_SRC INTO TAB_DEST.
APPEND TAB_DEST.
ENDLOOP.
TAB_DEST[] = TAB_SRC[].
Modifying a set of lines
LOOP AT TAB.
IF TAB-FLAG IS INITIAL.
 TAB-FLAG = 'X'.
ENDIF.
MODIFY TAB.
ENDLOOP.
TAB-FLAG = 'X'.
MODIFY TAB TRANSPORTING FLAG
 WHERE FLAG IS INITIAL.
Deleting a sequence of lines
DO 101 TIMES.
DELETE TAB_DEST INDEX 450.
ENDDO.
DELETE TAB_DEST FROM 450 TO 550.
Linear search vs. binary
READ TABLE TAB WITH KEY K = 'X'.
READ TABLE TAB WITH KEY K = 'X' BINARY SEARCH.
Comparison of internal tables
DESCRIBE TABLE: TAB1 LINES L1,
 TAB2 LINES L2.
IF L1 <> L2.
TAB_DIFFERENT = 'X'.
ELSE.
TAB_DIFFERENT = SPACE.
LOOP AT TAB1.
 READ TABLE TAB2 INDEX SY-TABIX.
 IF TAB1 <> TAB2.
 TAB_DIFFERENT = 'X'. EXIT.
 ENDIF.
ENDLOOP.
ENDIF.
IF TAB_DIFFERENT = SPACE.
ENDIF.
IF TAB1[] = TAB2[].
ENDIF.
Modify selected components
LOOP AT TAB.
TAB-DATE = SY-DATUM.
MODIFY TAB.
ENDLOOP.
WA-DATE = SY-DATUM.
LOOP AT TAB.
MODIFY TAB FROM WA TRANSPORTING DATE.
ENDLOOP.
Appending two internal tables
LOOP AT TAB_SRC.
APPEND TAB_SRC TO TAB_DEST.
ENDLOOP
APPEND LINES OF TAB_SRC TO TAB_DEST.
Deleting a set of lines
LOOP AT TAB_DEST WHERE K = KVAL.
DELETE TAB_DEST.
ENDLOOP
DELETE TAB_DEST WHERE K = KVAL.
Tools available in SAP to pin-point a performance problem
The runtime analysis (SE30)
SQL Trace (ST05)
Tips and Tricks tool
The performance database
Optimizing the load of the database
Using table buffering
Using buffered tables improves the performance considerably. Note that in some cases a stament can not be used with a buffered table, so when using these staments the buffer will be bypassed. These staments are:
Select DISTINCT
ORDER BY / GROUP BY / HAVING clause
Any WHERE clasuse that contains a subquery or IS NULL expression
JOIN s
A SELECT... FOR UPDATE
If you wnat to explicitly bypass the bufer, use the BYPASS BUFFER addition to the SELECT clause.
Use the ABAP SORT Clause Instead of ORDER BY
The ORDER BY clause is executed on the database server while the ABAP SORT statement is executed on the application server. The datbase server will usually be the bottleneck, so sometimes it is better to move thje sort from the datsbase server to the application server.
If you are not sorting by the primary key ( E.g. using the ORDER BY PRIMARY key statement) but are sorting by another key, it could be better to use the ABAP SORT stament to sort the data in an internal table. Note however that for very large result sets it might not be a feasible solution and you would want to let the datbase server sort it.
Avoid ther SELECT DISTINCT Statement
As with the ORDER BY clause it could be better to avoid using SELECT DISTINCT, if some of the fields are not part of an index. Instead use ABAP SORT + DELETE ADJACENT DUPLICATES on an internal table, to delete duplciate rows.
http://www.erpgenie.com/abap/performance.htm
http://www.thespot4sap.com/Articles/SAPABAPPerformanceTuning_PerformanceAnalysisTools.asp
http://www.sap-img.com/abap/performance-tuning-for-data-selection-statement.htm
for any clarifiaction pls mail me.
pls reward points, if this helped u.
regards,
anversha.
[email protected]

Regarding Performance Tunning of Mapping & Process Flow

Hi,
i have around 60-70 GB data in Target database.
i need do improve the performance of Mapping and Process flow.
i have used lookup transformation in mapping.
Plz give me some tips for improving performance of Process.
Thanks,

Please go through a Performance Tuning Book for Oracle 10gR2.
Most importantly remember that in Oracle 10g, your performace of mappings can be increased manifold by following these steps:
1. Do not design a mapping wherein you load a table and then select from that table to load another table and so on. This is a bad design.
2. Keep mappings as simple as possible. In other words if a mapping is complicated in terms of joins or other operators then split the mapping into more than one parts.
3. Also check that all your source tables should be analyzed using DBMS_STATS. Ensuring this one single step can make your work very easy.
4. Put indexes where you find your predicate has a very high selectivity. Also keep in mind the column ordering of the index.
5. Use Set Based operation, since it is always a good idea to achieve the result by running one single query rather than a loop and multiple inserts.
6. Use APPEND PARALLEL hint while loading the target tables. This will not generate wny redo and save time
7. Please have a recheck while usng some performance intensive operators like UNION, DISTINCT and AGGREGATION
8. When using a sequence operator to load a large table, check that the sequence should be cached with some values.
9. When loading large data HASH JOINS are the most appropriate more often than not. So you can use USE_HASH as the hint for selecting from large tables.
10. Filter out as much unrequired data from a table as soon as possible in the mapping before doing multiple joins.
I am sure there are many more ... the above is just a random list that I could remember now. Please go through Oracle Performance Tuning Guide, Tom Kyte's Oracle Expert One on One. Knowledge of performance tuning will grow with experience. I am also learning each day !!!
Regards
AP

Regarding Performance

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