Performance tuning in DW system

Hi All,
Now I am working for DW system. Some days ago, I was told if I want to get employee id and departmment name with some filter conditions in this dw system , I need to get employee ids and department ids first from this single table to create a new table first and then join this new one to department to get department name.
Because after filtering ,the data set will be small and makes the join faster.
I don't think this makes sense based on the rules in Oracle. But the execution time really got shorten dramatically.
So I want to ask why this happened and is it a general rule in DW system? Is the table join in DW really a high-cost operation?
best regards,
Leon

user12064076 wrote:
Hi William,
I wish the indexes would be there.
However, this is not allowed.Well, whoever is not allowing it, is preventing your database from working. A database without indexes is like a library where all the books are mixed up.
Since regular queries can be told by pre-computed tables, I only have to write a limited number of ad hoc queries.
So it's assumed that maintanance of such kind of indexes is not necessary. Always bad to assume things. Assumptions often come from people who don't know the facts.

Similar Messages

SAP CRM Performance tuning

From where can I get information or documents how to do performance tuning in SAP CRM?

Hi, Performance Tuning a SAP system is unique in every environment, also there are many area's in SAP to tune even area's outside SAP, eg... your Operating System/Network/Client Machines/Virtual Landscape/Cloud.
I recommend that you engage in a performance testing execise which will identify what area of your SAP Landscape needs tuning, first you need to identify the bottleneck before you can tune it.
The way the question was posed is exactly the same as wanting to fix a car but you have no idea which part of the car to fix...
*LoadRunner is an excellent tool to simulate virtual work load on an SAP environment*
Regards
Sodick25
http://www.2createawebsite.co.za
Edited by: Sodick25 on Aug 15, 2011 11:58 AM
Edited by: Sodick25 on Aug 15, 2011 11:59 AM

Performance tuning of the XI System

Hi Everybody,
We are testing the Interfaces in QA System and I see the messages are getting stuck when we have load.
Is there any performance tuning which can be done to better the performance..
Can somebody suggest me the options?
Helpful answers will be rewarded points.
Thanks & Regards,
Rupash K

Hi,
Check this "SAP Note 857530 "
Integration process performance(in sap XI).
Refer Try performance tuning :
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/70ada5ef-0201-0010-1f8b-c935e444b0ad
http://help.sap.com/saphelp_nw04/helpdata/en/9e/6921e784677d4591053564a8b95e7d/frameset.htm
Regards
Seshagiri

Performance tuning in CRM server

Hi everyone,
My CRM server working very slow. Idont know the exact reason. My server configuration IBM Xeon processor 3 Ghz 3GB RAM.There are about 25 users. Is this problem with SAP or Hardware.If any one have performance tuning document plz post it.
Thanks,
Murali

Chech the following:-
Processor usage
Ram usage
background jobs
how many user at a time
what kind of job they do
Any Network Problem
Increse Work Processor
increase Virtual Ram
And for 25 users, You need System with 2 CPU and 4 Gb Ram
Regards

Performance Tuning in IR

Hello All,
We have created some reports using Interactive Reporting Studio. The volume of data in that Oracle database are huge and in some tables of the relational database are having above 3-4 crores rows individually. We have created the .oce connection file using the 'Oracle Net' option. Oracle client ver is 10g. We earlier created pivot, chart and report in those .bqy files but had to delete those where-ever possible to decrease the processing time for getting those report generated.
But deleting those from the file and retaining just the result section (the bare minimum part of the file) even not yet helped us out solving the performance issue fully. Still now, in some reports, system gives error message 'Out of Memory' at the time of processing those reports. The memory of the client PCs,wherefrom the reports are being generated are 1 - 1.5 GB. For some reports, even it takes 1-2 hours for saving the results after process. In some cases, the PCs gets hanged at the time of processing. When we extract the query of those reports in sql and run them in TOAD/SQL PLUS, they take not so much time like IR.
Would you please help us out in the aforesaid issue ASAP? Please share your views/tips/suggestions etc in respect of performance tuning for IR. All reply would be highly appreciated.
Regards,
Raj

SQL + & Toad are tools that send SQL and spool results; IR is a tool that sends a request to the database to run SQL and then fiddles with the results before the user is even told data has been received. You need to minimize the time spent by IR manipulating results into objects the user isn't even asking for.
When a request is made to the database, Hyperion will wait until all of the results have been received. Once ALL of the results have been received, then IR will make multiple passes to apply sorts, filters and computed items existing in the results section. For some unknown reason, those three steps are performed more inefficiently then they would be performed in a table section. Only after all of the computed items have been calculated, all filters applied and all sorts sorted, then IR will start to calculate any reports, charts and pivots. After all that is done, the report stops processing and the data has been "returned"
To increase performance, you need to fine tune your IR Services and your BQY docs. Replicate your DAS on your server - it can only transfer 2g before it dies, restarts and your requested document hangs. You can replicated the DAS multiple times and should do so to make sure there are enough resources available for any concurrent users to make necessary requests and have data delivered to them.
To tune your bqy documents...
1) Your Results section MUST be free of any sorts, filters, or computed items. Create a staging table and put any sorts or local filters there. Move as many of your computed items to your database request line and ask the database to make the calculation (either directly or through stored procedures) so you are not at the mercy of the client machine. Any computed items that cannot be moved to the request line, need to be put on your new staging table.
2) Ask the users to choose filters. Programmatically build dynamic filters based on what the user is looking for. The goal is to cast a net only as big as the user needs so you are not bringing back unnecessary data. Otherwise, you will bring your server and client machines to a grinding halt.
3) Halt any report pagination. Built your reports from their own tables and put a dummy filter on the table that forces 0 rows in the table until the report is invoked. Hyperion will paginate every report BEFORE it even tells the user it has results so this will prevent the user from waiting an hour while 1000s of pages are paginated across multiple reports
4) Halt any object rendering until request. Same as above - create a system programmically for the user to tell the bqy what they want so they are not waiting forever for a pivot and 2 reports to compile and paginate when they want just a chart.
5) Saved compressed documents
6) Unless this document can be run as a job, there should be NO results stored with the document but if you do save results with the document, store the calculations too so you at least don't have to wait for them to pass again.
7) Remove all duplicate images and keep the image file size small.
Hope this helps!
PS: I forgot to mention - aside from results sections, in documents where the results are NOT saved, additional table sections take up very, very, very small bits of file size and, as long as there are not excessively larger images the same is true for Reports, Pivots and Charts. Additionally, the impact of file size only matters when the user is requesting the document. The file size is never an issue when the user is processing the report because it has already been delivered to them and cached (in workspace and in the web client)
Edited by: user10899957 on Feb 10, 2009 6:07 AM

VAL_FIELD selection to determine RSDRI or MDX query: performance tuning

according to on of the HTG I am working on performance tuning. one of the tip is to try to query base members by using BAS(xxx) in the expension pane of BPC report.
I did so and found an interesting issue in one of the COPA report.
with income statement, when I choose one node gross_profit, saying BAS(GROSS_PROFIT), it generates RSDRI query as I can see in UJSTAT. when I choose its parent, BAS(DIRECT_INCOME), it generates MDX query!
I checked DIRECT_INCOME has three members, GROSS_PROFIT, SGA, REV_OTHER. , none of them has any formulars.
in stead of calling BAS(DIRECT_INCOME), I called BAS(GROSS_PROFIT),BAS(SGA),BAS(REV_OTHER), I got RSDRI query again.
so in smmary,
BAS(PARENT) =>MDX query.
BAS(CHILD1)=>RSDRI query.
BAS(CHILD2)=>RSDRI query.
BAS(CHILD3)=>RSDRI query.
BAS(CHILD1),BAS(CHILD2),BAS(CHILD3)=>RSDRI query
I know VAL_FIELD is SAP reserved name for BPC dimensions. my question is why BAS(PARENT) =>MDX query.?
interestingly I can repeat this behavior in my system. my intention is to always get RSDRI query,
George

Ok - it turns out that Crystal Reports disregards BEx Query variables when put in the Default Values section of the filter selection.
I had mine there and even though CR prompted me for the variables AND the SQL statement it generated had an INCLUDE statement with hose variables I could see by my result set that it still returned everything in the cube as if there was no restriction on Plant for instance.
I should have paid more attention to the Info message I got in the BEx Query Designed. It specifically states that the "Variable located in Default Values will be ignored in the MDX Access".
After moving the variables to the Characteristic Restrictions my report worked as expected. The slow response time is still an issue but at least it's not compounded by trying to retrieve all records in the cube while I'm expecting less than 2k.
Hope this helps someone else

Reg: Process Chain, query performance tuning steps

Hi All,
I come across a question like, There is a process chain of 20 processes.out of which 5 processes are completed at the 6th step error occured and it cannot be rectified. I should start the chain again from the 7th step.If i go to a prticular step i can do that particular step, How can i start the entair chain again from step 7.i know that i need to use a function module but i dont know the name of FM. Please somebody help me out.
Please let me know the steps involved in query performance tuning and aggregate tuning.
Thanks & Regards
Omkar.K

Hi,
Process Chain
Method 1 (when it fails in a step/request)
/people/siegfried.szameitat/blog/2006/02/26/restarting-processchains
How is it possible to restart a process chain at a failed step/request?
Sometimes, it doesn't help to just set a request to green status in order to run the process chain from that step on to the end.
You need to set the failed request/step to green in the database as well as you need to raise the event that will force the process chain to run to the end from the next request/step on.
Therefore you need to open the messages of a failed step by right clicking on it and selecting 'display messages'.
In the opened popup click on the tab 'Chain'.
In a parallel session goto transaction se16 for table rspcprocesslog and display the entries with the following selections:
1. copy the variant from the popup to the variante of table rspcprocesslog
2. copy the instance from the popup to the instance of table rspcprocesslog
3. copy the start date from the popup to the batchdate of table rspcprocesslog
Press F8 to display the entries of table rspcprocesslog.
Now open another session and goto transaction se37. Enter RSPC_PROCESS_FINISH as the name of the function module and run the fm in test mode.
Now copy the entries of table rspcprocesslog to the input parameters of the function module like described as follows:
1. rspcprocesslog-log_id -> i_logid
2. rspcprocesslog-type -> i_type
3. rspcprocesslog-variante -> i_variant
4. rspcprocesslog-instance -> i_instance
5. enter 'G' for parameter i_state (sets the status to green).
Now press F8 to run the fm.
Now the actual process will be set to green and the following process in the chain will be started and the chain can run to the end.
Of course you can also set the state of a specific step in the chain to any other possible value like 'R' = ended with errors, 'F' = finished, 'X' = cancelled ....
Check out the value help on field rspcprocesslog-state in transaction se16 for the possible values.
Query performance tuning
General tips
Using aggregates and compression.
Using less and complex cell definitions if possible.
1. Avoid using too many nav. attr
2. Avoid RKF and CKF
3. Many chars in row.
By using T-codes ST03 or ST03N
Go to transaction ST03 > switch to expert mode > from left side menu > and there in system load history and distribution for a particual day > check query execution time.
/people/andreas.vogel/blog/2007/04/08/statistical-records-part-4-how-to-read-st03n-datasets-from-db-in-nw2004
/people/andreas.vogel/blog/2007/03/16/how-to-read-st03n-datasets-from-db
Try table rsddstats to get the statistics
Using cache memoery will decrease the loading time of the report.
Run reporting agent at night and sending results to email.This will ensure use of OLAP cache. So later report execution will retrieve the result faster from the OLAP cache.
Also try
1. Use different parameters in ST03 to see the two important parameters aggregation ratio and records transferred to F/E to DB selected.
2. Use the program SAP_INFOCUBE_DESIGNS (Performance of BW infocubes) to see the aggregation ratio for the cube. If the cube does not appear in the list of this report, try to run RSRV checks on the cube and aggregates.
Go to SE38 > Run the program SAP_INFOCUBE_DESIGNS
It will shown dimension Vs Fact tables Size in percent.If you mean speed of queries on a cube as performance metric of cube,measure query runtime.
3. --- sign is the valuation of the aggregate. You can say -3 is the valuation of the aggregate design and usage. ++ means that its compression is good and access is also more (in effect, performance is good). If you check its compression ratio, it must be good. -- means the compression ratio is not so good and access is also not so good (performance is not so good).The more is the positives...more is useful the aggregate and more it satisfies the number of queries. The greater the number of minus signs, the worse the evaluation of the aggregate. The larger the number of plus signs, the better the evaluation of the aggregate.
if "-----" then it means it just an overhead. Aggregate can potentially be deleted and "+++++" means Aggregate is potentially very useful.
Refer.
http://help.sap.com/saphelp_nw70/helpdata/en/b8/23813b310c4a0ee10000000a114084/content.htm
http://help.sap.com/saphelp_nw70/helpdata/en/60/f0fb411e255f24e10000000a1550b0/frameset.htm
4. Run your query in RSRT and run the query in the debug mode. Select "Display Aggregates Found" and "Do not use cache" in the debug mode. This will tell you if it hit any aggregates while running. If it does not show any aggregates, you might want to redesign your aggregates for the query.
Also your query performance can depend upon criteria and since you have given selection only on one infoprovider...just check if you are selecting huge amount of data in the report
Check for the query read mode in RSRT.(whether its A,X or H)..advisable read mode is X.
5. In BI 7 statistics need to be activated for ST03 and BI admin cockpit to work.
By implementing BW Statistics Business Content - you need to install, feed data and through ready made reports which for analysis.
http://help.sap.com/saphelp_nw70/helpdata/en/26/4bc0417951d117e10000000a155106/frameset.htm
/people/vikash.agrawal/blog/2006/04/17/query-performance-150-is-aggregates-the-way-out-for-me
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/1955ba90-0201-0010-d3aa-8b2a4ef6bbb2
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/ce7fb368-0601-0010-64ba-fadc985a1f94
http://help.sap.com/saphelp_nw04/helpdata/en/c1/0dbf65e04311d286d6006008b32e84/frameset.htm
You can go to T-Code DB20 which gives you all the performance related information like
Partitions
Databases
Schemas
Buffer Pools
Tablespaces etc
use tool RSDDK_CHECK_AGGREGATE in se38 to check for the corrupt aggregates
If aggregates contain incorrect data, you must regenerate them.
Note 646402 - Programs for checking aggregates (as of BW 3.0B SP15)
Thanks,
JituK

Performance Tuning for ECC 6.0

Hi All,
I have an ECC 6.0EP 7.0(ABAPJAVA). My system is very slow. I have Oracle 10.2.0.1.
Can you please guide me how to do these steps in the sytem
1) Reorganization should be done at least for the top 10 huge tables
and their indexes
2) Unaccessed data can be taken out by SAP Archiving
3)Apply the relevant corrections for top sap standard objects
4) CBO update statistics must be latest for all SAP and customer objects
I have never done performance tuning and want to do it on this system.
Regards,
Jitender

Hi,
Below are the details of ST06. Please suggest me what should I do. the system performance is very bad.
I require your inputs for performance tuning
CPU
Utilization user    %                   3     Count                                    2
              system %                   3      Load average 1min                0.11
              idle    %                       1                         5 min                0.21
              io wait %                    93                       15 min                0.22
System calls/s                        982 Context switches/s                    1752
Interrupts/s                          4528
Memory
Physical mem avail Kb             6291456 Physical mem free   Kb               93992
Pages in/s                             473 Kb paged in/s                         3784
Pages out/s                            211 Kb paged out/s                        1688
Pool
Configured swap     Kb            26869896 Maximum swap-space Kb            26869896
Free in swap-space Kb            21631032 Actual swap-space   Kb            26869896
Disk with highest response time
Name                                   md3 Response time       ms                  51
Utilization                              2     Queue                                    0
Avg wait time       ms              0    Avg service time    ms                  51
Kb transfered/s                       2   Operations/s                             0
Current parameters in the system
System:        sapretail_RET_01          Profile Parameters for SAP Buffers
Date and Time: 08.01.2009       13:27:54
Buffer Name                    Comment
Profile Parameter             Value      Unit Comment
Program buffer                 PXA
abap/buffersize               450000     kB    Size of program buffer
abap/pxa                      shared           Program buffer mode
|
CUA buffer                     CUA
rsdb/cua/buffersize           3000       kB    Size of CUA buffer
The number of max. buffered CUA objects is always: size / (2 kB)
                                                                                |
Screen buffer                  PRES
zcsa/presentation_buffer_area 4400000    Byte Size of screen buffer
sap/bufdir_entries            2000             Max. number of buffered screens
|
Generic key table buffer       TABL
zcsa/table_buffer_area        30000000   Byte Size of generic key table buffer
zcsa/db_max_buftab            5000             Max. number of buffered objects
|
Single record table buffer     TABLP
rtbb/buffer_length            10000      kB    Size of single record table buffer
rtbb/max_tables               500              Max. number of buffered tables
|
Export/import buffer           EIBUF
rsdb/obj/buffersize           4096       kB    Size of export/import buffer
rsdb/obj/max_objects          2000             Max. number of objects in the buffer
rsdb/obj/large_object_size    8192       Bytes Estimation for the size of the largest object
rsdb/obj/mutex_n              0                Number of mutexes in Export/Import buffer
|
OTR buffer                     OTR
rsdb/otr/buffersize_kb        4096       kB    Size of OTR buffer
rsdb/otr/max_objects          2000             Max. number of objects in the buffer
rsdb/otr/mutex_n              0                Number of mutexes in OTR buffer
|
Exp/Imp SHM buffer             ESM
rsdb/esm/buffersize_kb        4096       kB    Size of exp/imp SHM buffer
rsdb/esm/max_objects          2000             Max. number of objects in the buffer
rsdb/esm/large_object_size    8192       Bytes Estimation for the size of the largest object
rsdb/esm/mutex_n              0                Number of mutexes in Exp/Imp SHM buffer
|
Table definition buffer        TTAB
rsdb/ntab/entrycount          20000            Max. number of table definitions buffered
The size of the TTAB is nearly 100 bytes * rsdb/ntab/entrycount
                                                                                |
Field description buffer       FTAB
rsdb/ntab/ftabsize            30000      kB    Size of field description buffer
rsdb/ntab/entrycount          20000            Max. number / 2 of table descriptions buffered
FTAB needs about 700 bytes per used entry
                                                                                |
Initial record buffer          IRBD
rsdb/ntab/irbdsize            6000       kB    Size of initial record buffer
rsdb/ntab/entrycount          20000            Max. number / 2 of initial records buffered
IRBD needs about 300 bytes per used entry
                                                                                |
Short nametab (NTAB)           SNTAB
rsdb/ntab/sntabsize           3000       kB    Size of short nametab
rsdb/ntab/entrycount          20000            Max. number / 2 of entries buffered
SNTAB needs about 150 bytes per used entry
                                                                                |
Calendar buffer                CALE
zcsa/calendar_area            500000     Byte Size of calendar buffer
zcsa/calendar_ids             200              Max. number of directory entries
|
Roll, extended and heap memory EXTM
ztta/roll_area                3000000    Byte Roll area per workprocess (total)
ztta/roll_first               1          Byte First amount of roll area used in a dialog WP
ztta/short_area               3200000    Byte Short area per workprocess
rdisp/ROLL_SHM                16384      8 kB Part of roll file in shared memory
rdisp/PG_SHM                  8192       8 kB Part of paging file in shared memory
rdisp/PG_LOCAL                150        8 kB Paging buffer per workprocess
em/initial_size_MB            4092       MB    Initial size of extended memory
em/blocksize_KB               4096       kB    Size of one extended memory block
em/address_space_MB           4092       MB    Address space reserved for ext. mem. (NT only)
ztta/roll_extension           2000000000 Byte Max. extended mem. per session (external mode)
abap/heap_area_dia            2000000000 Byte Max. heap memory for dialog workprocesses
abap/heap_area_nondia         2000000000 Byte Max. heap memory for non-dialog workprocesses
abap/heap_area_total          2000000000 Byte Max. usable heap memory
abap/heaplimit                40000000   Byte Workprocess restart limit of heap memory
abap/use_paging               0                Paging for flat tables used (1) or not (0)
|
Statistic parameters
rsdb/staton                   1                Statistic turned on (1) or off (0)
rsdb/stattime                 0                Times for statistic turned on (1) or off (0)
Regards,
Jitender

Performance tuning for new OFMW environment

Hello
We have just set up a new UAT environment entirely on all Oracle FMW latest products which includes:
1) OS -RHEL V5
2) WebCenter
3) SOA Suite
4) Database
5) IDM
6) HTTP Server
7) WebLogic Server
As as post infrastructure setup plan we need to to performance tuning as well. Shall we do only WLS performance tuning or we need to tune each and every product in order to get optimum results.
Any guide? resource to help?
Pls advice
Regards
Dev

When you install the product soa-suite (and probably webcenter too) a prerequisite check is performed
that gives information about packages and parameters that need to be adjusted on your operating system.
For products that run on WebLogic Server you probably have to tune the JVM, examples can be found here:
- http://middlewaremagic.com/weblogic/?p=6930 (discusses JRockit)
- http://middlewaremagic.com/weblogic/?p=7083 (focuses on Coherence, but the considerations can be applied to other environments as well)
Examples that set-up the SOA-Suite can be found here:
- http://middlewaremagic.com/weblogic/?p=6040 (discusses considerations when installing the SOA suite)
- http://middlewaremagic.com/weblogic/?p=6872 (discusses considerations when adding the web-tier to the SOA suite)
The enterprise deployment guides can help too:
- SOA Suite: http://download.oracle.com/docs/cd/E21764_01/core.1111/e12036/toc.htm
- WebCenter: http://download.oracle.com/docs/cd/E21764_01/core.1111/e12037/toc.htm
These also contain sections on integration with Oracle Identity Management and the Oracle HTTP Server

Performance Tuning Question

Greetings,
I did a few searches for any topics related to this and
haven't found anything relevant - if I'm missing something obvious
I apologize.
We are doing some performance tuning of a CFMX 7.0.2 system
running on Solaris. Of the many things we're doing one is to run
truss on the cfmx processes to find out what in fact it's doing.
The following is an excerpt from one of the truss outputs:
stat64("/opt/coldfusionmx7/runtime/../lib/macromedia/jdbc/sqlserver/SQLServerURLParser.cla ss\0",
0x254FB860, 0x254FB9BC) = -1 Err#2
stat64("/opt/coldfusionmx7/runtime/../gateway/lib/macromedia/jdbc/oracle/OracleURLParser.c lass\0",
0x254FB860, 0x254FB9BC) = -1 Err#2
Err #2 means "File not found" in essence
These lines show up quite a bit in the output - and we're
curious as to why it's trying to find those particular classes at
all and why in those locations - there are other entries where it
looks like it's going through a series of paths that it knows about
trying to find these entries. As we use Oracle as our database what
could be the reason it's looking for SQLServer? Finally does anyone
know of a way to stop the attempt to find these classes and save
the system processing time to give us back those cycles for real
work?
Regards,
Scott

Please try:
Create View View3
As
SELECT a.Col1, a.Col2
From dbo.TableA A
WHERE NOT Exists (SELECT 1 From dbo.TableB B With(NoLock) WHERE A.Col1 = B.Col1)
UNION
SELECT Col1, Col2 From dbo.TableB
Also, please make sure that INDEXes on Col1 on both tables are NOT fragmented and your STATISTICS are also up tp date.
Best Wishes, Arbi; Please vote if you find this posting was helpful or Mark it as answered.

Performance tuning tools

hi Gurus,
Sorry to disturb u, have a big trouble with performance tuning.
I m working on performance tuning part for a project and i have got the w
they jus give me the whole report about the performance releated isses at all levels so everthing is there(repert is Based on Production ) but now after going through this report wot to do and where to start cos i only got access to Test client and no access to development cleint first things and than the major problem they are facing is that when they run report in a Test cleint performance is ok but when they run reports in a Production then system performance is really poor, so they want to know the reason for that as well.
as far as i understand is that for performance in prod system i should have acces to the system first and thean check the database there,so the thing is that can u plz tell me that how to check the database and how to run whole system report on that system as well which gives me complete report for the whole system performance including OS level, DB level,And than SAP systme level,they have some of this kind of tool here to use that but dont kknow which 1 is that and how to use that.
waiting for reply.
thanks In advance.
regards
Amit

Hi Dash,
thanks for quick reply.
when i go and check the report in ST02 so there Hit Ratio is 99.94%, but query running time is significantly or i should say more than 3 times in Production system, so dont know where the problem is.
Cos i m getting slow performance in a Prod system so dont know that how to start analysis on that systme cos i dont have acess to Prod system, so plz and other
commment on this ll be appriciated.
thanks
regards
Amit

Performance tuning for ECC5

Hi,
Can any one guide me how to do the performance tuning in an ECC5,
MSSQL2000,Windows 2003 system
Here the RAM size is 3.5 gb.
Page file size was 9 gb(i increased that to 11.5 gb (3*RAM+ 1 gb)
Also increased the abap/buffer size to 400000.
Regards,
Arun

Hi Arun,
Go through the following links which are very useful in understanding the parameters values.
Zero administration memory management
Regarding Virtual Memory?
Regards,
Hari.
PS: Points are welcome.

Performance tuning measures in B2B 11g

Hi Gurus,
I am working on SOA Suite 11.1.1.3. I wanted to know performance tuning measures which could be configured in our B2B production instance.
Need some information on how performance tuning could be done in both outbound and inbound flow. Please suggest few solutions which you might have implemented in your projects
Thanks in advance

Hi,
Performance and throughput depends on hardware ,software and designed architecture. In a very basic system, we are able to achieve more then 20 msg/second.
If you want more details, drop a mail to me or our PM ([email protected]) .
Rgds,
Nitesh Jain
[email protected]

Performance Tuning Guidelines for Windows Server 2008 R2 mistake?

Hi all,
I'm reading the "Performance Tuning Guidelines for Windows Server 2008 R2" and I think there is same kind of error. At page 53 there is a sub chapter "I/O Priorities" that explain how to handle I/O priorities.
In the guide it is said that in the registry I have to have a key:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\DeviceClasses\{Device GUID}\DeviceParameters\Classpnp\
Where {Device GUID} I think it is the value I get in device manager under one of my disks -> properties -> details -> "Device Class GUID"
the trouble is that under the key HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\DeviceClasses\ I've no subkey matching my disk's device class guid! Maybe I'm drunk but I've checked every sub key under HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\DeviceClasses\
but neither of them as a subkey named "DeviceParameter"!!
So am I wrong?

Hi Andrea,
To find the "DeviceParameter", please try to follow the steps below:
1.Find this registry key and note the DeviceInstance value:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceClasses\
2.Find the device instance registry key under "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum" which contains information about the devices on the system and get the device interface GUID:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\USB\<hardware id>\<instance id>\Device Parameters
I hope this helps.

Performance Tuning Tips

Dear All,
In our project we are facing lot of problems with the Performance, users are compaining about the poor performance of the few reports and all, we are in the process of fine tuning the reports by following the all methods/suggestions provided by SAP ( like removing the select queries from Loops, For all entries , Binary serach etc )
But still I want to know from you people what can we check from BASIS percpective ( all the settings ) and also ABAP percpective to improve the performance.
And also I have one more query that what is " Table Statistics " , what is the use of this ...
Please give ur valueble suggestions to us in improving the performance .
Thanks in Advance !

Hi
Ways of Performance Tuning
1. Selection Criteria
2. Select Statements
 Select Queries
 SQL Interface
 Aggregate Functions
 For all Entries
Select Over more than one Internal table
Selection Criteria
1. Restrict the data to the selection criteria itself, rather than filtering it out using the ABAP code using CHECK statement.
2. Select with selection list.
Points # 1/2
SELECT * FROM SBOOK INTO SBOOK_WA.
CHECK: SBOOK_WA-CARRID = 'LH' AND
 SBOOK_WA-CONNID = '0400'.
ENDSELECT.
The above code can be much more optimized by the code written below which avoids CHECK, selects with selection list
SELECT CARRID CONNID FLDATE BOOKID FROM SBOOK INTO TABLE T_SBOOK
WHERE SBOOK_WA-CARRID = 'LH' AND
 SBOOK_WA-CONNID = '0400'.
Select Statements Select Queries
1. Avoid nested selects
2. Select all the records in a single shot using into table clause of select statement rather than to use Append statements.
3. When a base table has multiple indices, the where clause should be in the order of the index, either a primary or a secondary index.
4. For testing existence , use Select.. Up to 1 rows statement instead of a Select-Endselect-loop with an Exit.
5. Use Select Single if all primary key fields are supplied in the Where condition .
Point # 1
SELECT * FROM EKKO INTO EKKO_WA.
SELECT * FROM EKAN INTO EKAN_WA
 WHERE EBELN = EKKO_WA-EBELN.
ENDSELECT.
ENDSELECT.
The above code can be much more optimized by the code written below.
SELECT PF1 PF2 FF3 FF4 INTO TABLE ITAB
 FROM EKKO AS P INNER JOIN EKAN AS F
 ON PEBELN = FEBELN.
Note: A simple SELECT loop is a single database access whose result is passed to the ABAP program line by line. Nested SELECT loops mean that the number of accesses in the inner loop is multiplied by the number of accesses in the outer loop. One should therefore use nested SELECT loops only if the selection in the outer loop contains very few lines or the outer loop is a SELECT SINGLE statement.
Point # 2
SELECT * FROM SBOOK INTO SBOOK_WA.
CHECK: SBOOK_WA-CARRID = 'LH' AND
 SBOOK_WA-CONNID = '0400'.
ENDSELECT.
The above code can be much more optimized by the code written below which avoids CHECK, selects with selection list and puts the data in one shot using into table
SELECT CARRID CONNID FLDATE BOOKID FROM SBOOK INTO TABLE T_SBOOK
WHERE SBOOK_WA-CARRID = 'LH' AND
 SBOOK_WA-CONNID = '0400'.
Point # 3
To choose an index, the optimizer checks the field names specified in the where clause and then uses an index that has the same order of the fields . In certain scenarios, it is advisable to check whether a new index can speed up the performance of a program. This will come handy in programs that access data from the finance tables.
Point # 4
SELECT * FROM SBOOK INTO SBOOK_WA
UP TO 1 ROWS
WHERE CARRID = 'LH'.
ENDSELECT.
The above code is more optimized as compared to the code mentioned below for testing existence of a record.
SELECT * FROM SBOOK INTO SBOOK_WA
 WHERE CARRID = 'LH'.
EXIT.
ENDSELECT.
Point # 5
If all primary key fields are supplied in the Where condition you can even use Select Single.
Select Single requires one communication with the database system, whereas Select-Endselect needs two.
Select Statements contd.. SQL Interface
1. Use column updates instead of single-row updates
to update your database tables.
2. For all frequently used Select statements, try to use an index.
3. Using buffered tables improves the performance considerably.
Point # 1
SELECT * FROM SFLIGHT INTO SFLIGHT_WA.
SFLIGHT_WA-SEATSOCC =
 SFLIGHT_WA-SEATSOCC - 1.
UPDATE SFLIGHT FROM SFLIGHT_WA.
ENDSELECT.
The above mentioned code can be more optimized by using the following code
UPDATE SFLIGHT
 SET SEATSOCC = SEATSOCC - 1.
Point # 2
SELECT * FROM SBOOK CLIENT SPECIFIED INTO SBOOK_WA
WHERE CARRID = 'LH'
 AND CONNID = '0400'.
ENDSELECT.
The above mentioned code can be more optimized by using the following code
SELECT * FROM SBOOK CLIENT SPECIFIED INTO SBOOK_WA
WHERE MANDT IN ( SELECT MANDT FROM T000 )
 AND CARRID = 'LH'
 AND CONNID = '0400'.
ENDSELECT.
Point # 3
Bypassing the buffer increases the network considerably
SELECT SINGLE * FROM T100 INTO T100_WA
BYPASSING BUFFER
WHERE SPRSL = 'D'
 AND ARBGB = '00'
 AND MSGNR = '999'.
The above mentioned code can be more optimized by using the following code
SELECT SINGLE * FROM T100 INTO T100_WA
WHERE SPRSL = 'D'
 AND ARBGB = '00'
 AND MSGNR = '999'.
Select Statements contd Aggregate Functions
 If you want to find the maximum, minimum, sum and average value or the count of a database column, use a select list with aggregate functions instead of computing the aggregates yourself.
Some of the Aggregate functions allowed in SAP are MAX, MIN, AVG, SUM, COUNT, COUNT( * )
Consider the following extract.
 Maxno = 0.
 Select * from zflight where airln = LF and cntry = IN.
 Check zflight-fligh > maxno.
 Maxno = zflight-fligh.
 Endselect.
The above mentioned code can be much more optimized by using the following code.
Select max( fligh ) from zflight into maxno where airln = LF and cntry = IN.
Select Statements contdFor 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)
Points to be must considered FOR ALL ENTRIES Check that data is present in the driver table
 Sorting the driver table
 Removing duplicates from the driver table
Consider the following piece of extract
Loop at int_cntry.
 Select single * from zfligh into int_fligh
where cntry = int_cntry-cntry.
Append int_fligh.
Endloop.
The above mentioned can be more optimized by using the following code.
Sort int_cntry by cntry.
Delete adjacent duplicates from int_cntry.
If NOT int_cntry[] is INITIAL.
 Select * from zfligh appending table int_fligh
 For all entries in int_cntry
 Where cntry = int_cntry-cntry.
Endif.
Select Statements contd Select Over more than one Internal table
1. Its better to use a views instead of nested Select statements.
2. To read data from several logically connected tables use a join instead of nested Select statements. Joins are preferred only if all the primary key are available in WHERE clause for the tables that are joined. If the primary keys are not provided in join the Joining of tables itself takes time.
3. Instead of using nested Select loops it is often better to use subqueries.
Point # 1
SELECT * FROM DD01L INTO DD01L_WA
WHERE DOMNAME LIKE 'CHAR%'
 AND AS4LOCAL = 'A'.
SELECT SINGLE * FROM DD01T INTO DD01T_WA
 WHERE DOMNAME = DD01L_WA-DOMNAME
 AND AS4LOCAL = 'A'
 AND AS4VERS = DD01L_WA-AS4VERS
 AND DDLANGUAGE = SY-LANGU.
ENDSELECT.
The above code can be more optimized by extracting all the data from view DD01V_WA
SELECT * FROM DD01V INTO DD01V_WA
WHERE DOMNAME LIKE 'CHAR%'
 AND DDLANGUAGE = SY-LANGU.
ENDSELECT
Point # 2
SELECT * FROM EKKO INTO EKKO_WA.
SELECT * FROM EKAN INTO EKAN_WA
 WHERE EBELN = EKKO_WA-EBELN.
ENDSELECT.
ENDSELECT.
The above code can be much more optimized by the code written below.
SELECT PF1 PF2 FF3 FF4 INTO TABLE ITAB
 FROM EKKO AS P INNER JOIN EKAN AS F
 ON PEBELN = FEBELN.
Point # 3
SELECT * FROM SPFLI
INTO TABLE T_SPFLI
WHERE CITYFROM = 'FRANKFURT'
 AND CITYTO = 'NEW YORK'.
SELECT * FROM SFLIGHT AS F
 INTO SFLIGHT_WA
 FOR ALL ENTRIES IN T_SPFLI
 WHERE SEATSOCC < F~SEATSMAX
 AND CARRID = T_SPFLI-CARRID
 AND CONNID = T_SPFLI-CONNID
 AND FLDATE BETWEEN '19990101' AND '19990331'.
ENDSELECT.
The above mentioned code can be even more optimized by using subqueries instead of for all entries.
SELECT * FROM SFLIGHT AS F INTO SFLIGHT_WA
 WHERE SEATSOCC < F~SEATSMAX
 AND EXISTS ( SELECT * FROM SPFLI
 WHERE CARRID = F~CARRID
 AND CONNID = F~CONNID
 AND CITYFROM = 'FRANKFURT'
 AND CITYTO = 'NEW YORK' )
 AND FLDATE BETWEEN '19990101' AND '19990331'.
ENDSELECT.
Internal Tables
1. Table operations should be done using explicit work areas rather than via header lines.
2. Always try to use binary search instead of linear search. But dont forget to sort your internal table before that.
3. A dynamic key access is slower than a static one, since the key specification must be evaluated at runtime.
4. A binary search using secondary index takes considerably less time.
5. LOOP ... WHERE is faster than LOOP/CHECK because LOOP ... WHERE evaluates the specified condition internally.
6. Modifying selected components using MODIFY itab TRANSPORTING f1 f2.. accelerates the task of updating a line of an internal table.
Point # 2
READ TABLE ITAB INTO WA WITH KEY K = 'X BINARY SEARCH.
IS MUCH FASTER THAN USING
READ TABLE ITAB INTO WA WITH KEY K = 'X'.
If TAB has n entries, linear search runs in O( n ) time, whereas binary search takes only O( log2( n ) ).
Point # 3
READ TABLE ITAB INTO WA WITH KEY K = 'X'. IS FASTER THAN USING
READ TABLE ITAB INTO WA WITH KEY (NAME) = 'X'.
Point # 5
LOOP AT ITAB INTO WA WHERE K = 'X'.
ENDLOOP.
The above code is much faster than using
LOOP AT ITAB INTO WA.
CHECK WA-K = 'X'.
ENDLOOP.
Point # 6
WA-DATE = SY-DATUM.
MODIFY ITAB FROM WA INDEX 1 TRANSPORTING DATE.
The above code is more optimized as compared to
WA-DATE = SY-DATUM.
MODIFY ITAB FROM WA INDEX 1.
7. Accessing the table entries directly in a "LOOP ... ASSIGNING ..." accelerates the task of updating a set of lines of an internal table considerably
8. If collect semantics is required, it is always better to use to COLLECT rather than READ BINARY and then ADD.
9. "APPEND LINES OF itab1 TO itab2" accelerates the task of appending a table to another table considerably as compared to LOOP-APPEND-ENDLOOP.
10. DELETE ADJACENT DUPLICATES accelerates the task of deleting duplicate entries considerably as compared to READ-LOOP-DELETE-ENDLOOP.
11. "DELETE itab FROM ... TO ..." accelerates the task of deleting a sequence of lines considerably as compared to DO -DELETE-ENDDO.
Point # 7
Modifying selected components only makes the program faster as compared to Modifying all lines completely.
e.g,
LOOP AT ITAB ASSIGNING <WA>.
I = SY-TABIX MOD 2.
IF I = 0.
 <WA>-FLAG = 'X'.
ENDIF.
ENDLOOP.
The above code works faster as compared to
LOOP AT ITAB INTO WA.
I = SY-TABIX MOD 2.
IF I = 0.
 WA-FLAG = 'X'.
 MODIFY ITAB FROM WA.
ENDIF.
ENDLOOP.
Point # 8
LOOP AT ITAB1 INTO WA1.
READ TABLE ITAB2 INTO WA2 WITH KEY K = WA1-K BINARY SEARCH.
IF SY-SUBRC = 0.
 ADD: WA1-VAL1 TO WA2-VAL1,
 WA1-VAL2 TO WA2-VAL2.
 MODIFY ITAB2 FROM WA2 INDEX SY-TABIX TRANSPORTING VAL1 VAL2.
ELSE.
 INSERT WA1 INTO ITAB2 INDEX SY-TABIX.
ENDIF.
ENDLOOP.
The above code uses BINARY SEARCH for collect semantics. READ BINARY runs in O( log2(n) ) time. The above piece of code can be more optimized by
LOOP AT ITAB1 INTO WA.
COLLECT WA INTO ITAB2.
ENDLOOP.
SORT ITAB2 BY K.
COLLECT, however, uses a hash algorithm and is therefore independent
of the number of entries (i.e. O(1)) .
Point # 9
APPEND LINES OF ITAB1 TO ITAB2.
This is more optimized as compared to
LOOP AT ITAB1 INTO WA.
APPEND WA TO ITAB2.
ENDLOOP.
Point # 10
DELETE ADJACENT DUPLICATES FROM ITAB COMPARING K.
This is much more optimized as compared to
READ TABLE ITAB INDEX 1 INTO PREV_LINE.
LOOP AT ITAB FROM 2 INTO WA.
IF WA = PREV_LINE.
 DELETE ITAB.
ELSE.
 PREV_LINE = WA.
ENDIF.
ENDLOOP.
Point # 11
DELETE ITAB FROM 450 TO 550.
This is much more optimized as compared to
DO 101 TIMES.
DELETE ITAB INDEX 450.
ENDDO.
12. Copying internal tables by using ITAB2[ ] = ITAB1[ ] as compared to LOOP-APPEND-ENDLOOP.
13. Specify the sort key as restrictively as possible to run the program faster.
Point # 12
ITAB2[] = ITAB1[].
This is much more optimized as compared to
REFRESH ITAB2.
LOOP AT ITAB1 INTO WA.
APPEND WA TO ITAB2.
ENDLOOP.
Point # 13SORT ITAB BY K. makes the program runs faster as compared to SORT ITAB.
Internal Tables contd
Hashed and Sorted tables
1. For single read access hashed tables are more optimized as compared to sorted tables.
2. For partial sequential access sorted tables are more optimized as compared to hashed tables
Hashed And Sorted Tables
Point # 1
Consider the following example where HTAB is a hashed table and STAB is a sorted table
DO 250 TIMES.
N = 4 * SY-INDEX.
READ TABLE HTAB INTO WA WITH TABLE KEY K = N.
IF SY-SUBRC = 0.
ENDIF.
ENDDO.
This runs faster for single read access as compared to the following same code for sorted table
DO 250 TIMES.
N = 4 * SY-INDEX.
READ TABLE STAB INTO WA WITH TABLE KEY K = N.
IF SY-SUBRC = 0.
ENDIF.
ENDDO.
Point # 2
Similarly for Partial Sequential access the STAB runs faster as compared to HTAB
LOOP AT STAB INTO WA WHERE K = SUBKEY.
ENDLOOP.
This runs faster as compared to
LOOP AT HTAB INTO WA WHERE K = SUBKEY.
ENDLOOP.
Reward if usefull

Performance tuning in DW system

Similar Messages

Maybe you are looking for