Resources for performance tuning and RAC needed

Can you suggest me the best knowledge resources for performance tuning and RAC?
Besides Oracle doc ...
Thanks!

Before all, I'm searching for resources on web like performance tuning from Dizwell Informatics is.
Anyway thank you Eric for your suggestion!

Similar Messages

Can anyone plz tell me the steps for performance tuning.

hello friends
what is performance tuning?
can anyone plz tell me the steps for performance tuning.

Hi Kishore, this will help u.
Following are the different tools provided by SAP for performance analysis of an ABAP object
Run time analysis transaction SE30
This transaction gives all the analysis of an ABAP program with respect to the database and the non-database processing.
SQL Trace transaction ST05
The trace list has many lines that are not related to the SELECT statement in the ABAP program. This is because the execution of any ABAP program requires additional administrative SQL calls. To restrict the list output, use the filter introducing the trace list.
The trace list contains different SQL statements simultaneously related to the one SELECT statement in the ABAP program. This is because the R/3 Database Interface - a sophisticated component of the R/3 Application Server - maps every Open SQL statement to one or a series of physical database calls and brings it to execution. This mapping, crucial to R/3s performance, depends on the particular call and database system. For example, the SELECT-ENDSELECT loop on the SPFLI table in our test program is mapped to a sequence PREPARE-OPEN-FETCH of physical calls in an Oracle environment.
The WHERE clause in the trace list's SQL statement is different from the WHERE clause in the ABAP statement. This is because in an R/3 system, a client is a self-contained unit with separate master records and its own set of table data (in commercial, organizational, and technical terms). With ABAP, every Open SQL statement automatically executes within the correct client environment. For this reason, a condition with the actual client code is added to every WHERE clause if a client field is a component of the searched table.
To see a statement's execution plan, just position the cursor on the PREPARE statement and choose Explain SQL. A detailed explanation of the execution plan depends on the database system in use.
Need for performance tuning
In this world of SAP programming, ABAP is the universal language. In most of the projects, the focus is on getting a team of ABAP programmers as soon as possible, handing over the technical specifications to them and asking them to churn out the ABAP programs within the given deadlines.
Often due to this pressure of schedules and deliveries, the main focus of making a efficient program takes a back seat. An efficient ABAP program is one which delivers the required output to the user in a finite time as per the complexity of the program, rather than hearing the comment I put the program to run, have my lunch and come back to check the results.
Leaving aside the hyperbole, a performance optimized ABAP program saves the time of the end user, thus increasing the productivity of the user, and in turn keeping the user and the management happy.
This tutorial focuses on presenting various performance tuning tips and tricks to make the ABAP programs efficient in doing their work. This tutorial also assumes that the reader is well versed in all the concepts and syntax of ABAP programming.
Use of selection criteria
Instead of selecting all the data and doing the processing during the selection, it is advisable to restrict the data to the selection criteria itself, rather than filtering it out using the ABAP code.
Not recommended
Select * from zflight.
Check : zflight-airln = LF and zflight-fligh = BW222.
Endselect.
Recommended
Select * from zflight where airln = LF and fligh = 222.
Endselect.
One more point to be noted here is of the select *. Often this is a lazy coding practice. When a programmer gives select * even if one or two fields are to be selected, this can significantly slow the program and put unnecessary load on the entire system. When the application server sends this request to the database server, and the database server has to pass on the entire structure for each row back to the application server. This consumes both CPU and networking resources, especially for large structures.
Thus it is advisable to select only those fields that are needed, so that the database server passes only a small amount of data back.
Also it is advisable to avoid selecting the data fields into local variables as this also puts unnecessary load on the server. Instead attempt must be made to select the fields into an internal table.
Use of aggregate functions
Use the already provided aggregate functions, instead of finding out the minimum/maximum values using ABAP code.
Not recommended
Maxnu = 0.
Select * from zflight where airln = LF and cntry = IN.
Check zflight-fligh > maxnu.
Maxnu = zflight-fligh.
Endselect.
Recommended
Select max( fligh ) from zflight into maxnu where airln = LF and cntry = IN.
The other aggregate functions that can be used are min (to find the minimum value), avg (to find the average of a Data interval), sum (to add up a data interval) and count (counting the lines in a data selection).
Use of Views instead of base tables
Many times ABAP programmers deal with base tables and nested selects. Instead it is always advisable to see whether there is any view provided by SAP on those base tables, so that the data can be filtered out directly, rather than specially coding for it.
Not recommended
Select * from zcntry where cntry like IN%.
Select single * from zflight where cntry = zcntry-cntry and airln = LF.
Endselect.
Recommended
Select * from zcnfl where cntry like IN% and airln = LF.
Endselect.
Check this links
http://www.sapdevelopment.co.uk/perform/performhome.htm
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/afbad390-0201-0010-daa4-9ef0168d41b6
kindly reward if found helpful.
cheers,
Hema.

Can anyone send tutor for performance tuning?

can anyone send tutor for performance tuning?I like to chk my coding.

1.      Unused/Dead code
Avoid leaving unused code in the program. Either comment out or delete the unused situation. Use program --> check --> extended program to check for the variables, which are not used statically.
2.      Subroutine Usage
For good modularization, the decision of whether or not to execute a subroutine should be made before the subroutine is called. For example:
This is better:
IF f1 NE 0.
PERFORM sub1.
ENDIF.
FORM sub1.
ENDFORM.
Than this:
PERFORM sub1.
FORM sub1.
IF f1 NE 0.
ENDIF.
ENDFORM.
3.      Usage of IF statements
When coding IF tests, nest the testing conditions so that the outer conditions are those which are most likely to fail. For logical expressions with AND , place the mostly likely false first and for the OR, place the mostly likely true first.
Example - nested IF's:
IF (least likely to be true).
    IF (less likely to be true).
     IF (most likely to be true).
     ENDIF.
    ENDIF.
   ENDIF.
Example - IF...ELSEIF...ENDIF :
IF (most likely to be true).
ELSEIF (less likely to be true).
ELSEIF (least likely to be true).
ENDIF.
Example - AND:
   IF (least likely to be true) AND
      (most likely to be true).
   ENDIF.
Example - OR:
        IF (most likely to be true) OR
      (least likely to be true).
4.      CASE vs. nested Ifs
When testing fields "equal to" something, one can use either the nested IF or the CASE statement. The CASE is better for two reasons. It is easier to read and after about five nested IFs the performance of the CASE is more efficient.
5.      MOVE statements
When records a and b have the exact same structure, it is more efficient to MOVE a TO b than to MOVE-CORRESPONDING a TO b.
MOVE BSEG TO *BSEG.
is better than
MOVE-CORRESPONDING BSEG TO *BSEG.
6.      SELECT and SELECT SINGLE
When using the SELECT statement, study the key and always provide as much of the left-most part of the key as possible. If the entire key can be qualified, code a SELECT SINGLE not just a SELECT.   If you are only interested in the first row or there is only one row to be returned, using SELECT SINGLE can increase performance by up to three times.
7.      Small internal tables vs. complete internal tables
In general it is better to minimize the number of fields declared in an internal table. While it may be convenient to declare an internal table using the LIKE command, in most cases, programs will not use all fields in the SAP standard table.
For example:
Instead of this:
data: t_mara like mara occurs 0 with header line.
Use this:
data: begin of t_mara occurs 0,
        matnr like mara-matnr,
        end of t_mara.
8.      Row-level processing and SELECT SINGLE
Similar to the processing of a SELECT-ENDSELECT loop, when calling multiple SELECT-SINGLE commands on a non-buffered table (check Data Dictionary -> Technical Info), you should do the following to improve performance:
o       Use the SELECT into <itab> to buffer the necessary rows in an internal table, then
o       sort the rows by the key fields, then
o       use a READ TABLE WITH KEY ... BINARY SEARCH in place of the SELECT SINGLE command. Note that this only make sense when the table you are buffering is not too large (this decision must be made on a case by case basis).
9.      READing single records of internal tables
When reading a single record in an internal table, the READ TABLE WITH KEY is not a direct READ. This means that if the data is not sorted according to the key, the system must sequentially read the table.   Therefore, you should:
o       SORT the table
o       use READ TABLE WITH KEY BINARY SEARCH for better performance.
10. SORTing internal tables
When SORTing internal tables, specify the fields to SORTed.
SORT ITAB BY FLD1 FLD2.
is more efficient than
SORT ITAB.
11. Number of entries in an internal table
To find out how many entries are in an internal table use DESCRIBE.
DESCRIBE TABLE ITAB LINES CNTLNS.
is more efficient than
LOOP AT ITAB.
CNTLNS = CNTLNS + 1.
ENDLOOP.
12. Performance diagnosis
To diagnose performance problems, it is recommended to use the SAP transaction SE30, ABAP/4 Runtime Analysis. The utility allows statistical analysis of transactions and programs.
13. Nested SELECTs versus table views
Since releASE 4.0, OPEN SQL allows both inner and outer table joins. A nested SELECT loop may be used to accomplish the same concept. However, the performance of nested SELECT loops is very poor in comparison to a join. Hence, to improve performance by a factor of 25x and reduce network load, you should either create a view in the data dictionary then use this view to select data, or code the select using a join.
14. If nested SELECTs must be used
As mentioned previously, performance can be dramatically improved by using views instead of nested SELECTs, however, if this is not possible, then the following example of using an internal table in a nested SELECT can also improve performance by a factor of 5x:
Use this:
form select_good.
data: t_vbak like vbak occurs 0 with header line.
data: t_vbap like vbap occurs 0 with header line.
select * from vbak into table t_vbak up to 200 rows.
select * from vbap
          for all entries in t_vbak
          where vbeln = t_vbak-vbeln.
endselect.
endform.
Instead of this:
form select_bad.
select * from vbak up to 200 rows.
select * from vbap where vbeln = vbak-vbeln.
endselect.
endselect.
endform.
Although using "SELECT...FOR ALL ENTRIES IN..." is generally very fast, you should be aware of the three pitfalls of using it:
Firstly, SAP automatically removes any duplicates from the rest of the retrieved records. Therefore, if you wish to ensure that no qualifying records are discarded, the field list of the inner SELECT must be designed to ensure the retrieved records will contain no duplicates (normally, this would mean including in the list of retrieved fields all of those fields that comprise that table's primary key).
Secondly, if you were able to code "SELECT ... FROM <database table> FOR ALL ENTRIES IN TABLE <itab>" and the internal table <itab> is empty, then all rows from <database table> will be retrieved.
Thirdly, if the internal table supplying the selection criteria (i.e. internal table <itab> in the example "...FOR ALL ENTRIES IN TABLE <itab> ") contains a large number of entries, performance degradation may occur.
15. SELECT * versus SELECTing individual fields
In general, use a SELECT statement specifying a list of fields instead of a SELECT * to reduce network traffic and improve performance. For tables with only a few fields the improvements may be minor, but many SAP tables contain more than 50 fields when the program needs only a few. In the latter case, the performace gains can be substantial. For example:
Use:
select vbeln auart vbtyp from table vbak
into (vbak-vbeln, vbak-auart, vbak-vbtyp)
where ...
Instead of using:
select * from vbak where ...
16. Avoid unnecessary statements
There are a few cases where one command is better than two. For example:
Use:
append <tab_wa> to <tab>.
Instead of:
<tab> = <tab_wa>.
append <tab> (modify <tab>).
And also, use:
if not <tab>[] is initial.
Instead of:
describe table <tab> lines <line_counter>.
if <line_counter> > 0.
17. Copying or appending internal tables
Use this:
<tab2>[] = <tab1>[]. (if <tab2> is empty)
Instead of this:
loop at <tab1>.
append <tab1> to <tab2>.
endloop.
However, if <tab2> is not empty and should not be overwritten, then use:
append lines of <tab1> [from index1] [to index2] to <tab2>.
P.S : Please reward if you find this useful..

ABAP Programs Performance Tuning and Web Services

Hi,
Can anyone give me any good material link or eBook on SAP ABAP programs Performance Tuning. What are the things that needs to be done for performance tuning etc..
Also, any material or simple eBook on web services.
my email is [email protected]
Thanks a ton in advance.
Swetha.

Check this link ABAP Development Performance Tuning
https://www.sdn.sap.com/irj/sdn/wiki?path=/display/abap/performance%2btuning
Check these threads.
How do you take care of performance issues in your ABAP programs?
http://help.sap.com/saphelp_nw04/helpdata/en/9f/db9bd335c111d1829f0000e829fbfe/frameset.htm

Resources for designing redundancy and load balancing among data centers

Hello all,
I'm looking for resources for designing redundancy and load balancing between two physically separate data centers. I'm looking for some "best practice" links, tips, or recommendations. Any suggestions are appreciated!
Thanks.

I think that we can do per packet load balancing by using CEF.
Please go to the following URL:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fswtch_c/swprt1/xcfcefc.htm#xtocid5
Also, you may need local director or distributed director. What resource/application is availalbe in the data centre? (e.g. http server, ftp server, TN3270 server, and so on)

I am going to buy a macbook pro for grade 12, and I need to know wheather I should get a macbook pro or a macbook pro retina. If someone could tell me (in a very simple way) which one is,better for me and why, I would be ever so apprreciative.

I am going to buy a macbook pro for grade 12, and I need to know wheather I should get a macbook pro or a macbook pro retina. If someone could tell me (in a very simple way) which one is,better for me and why, I would be ever so apprreciative.

Why do you need a expensive MacBook Pro?
Your attending high school and unless everyone else is rich also your likely going to be a target by the more poorer students for theft or damage to the machine.
You could keep it home, but if you need it for class then your exposed again.
Also at that age your not very careful yet, a MacBook Pro is a expensive and easily damaged machine.
Unless your made of money and so are others at your school, I would recommned a low profile, just does the job cheap Windows PC.
If it dies, gets lost, stolen or damaged because of your inexperince handling senstivie electronics then it's no big deal.
You can buy a Mac later on when your sure you have a need for it, currently there isn't much advantage of owning a Mac compared to a PC, they do just about the same things now, one just looks prettier than the other.
Since 95% of the world uses Windows PC's your going to have to install Windows on the Mac in order to keep your skills up there or be unemployed, so it's a extra headache and expense.
good luck

I've designed a magazine prototype for a client and I need it to flip pages like a book on an i-pad. What software will do this?

I've designed a magazine prototype for a client and I need it to flip pages like a book for her sales team to show on ipads. What software will do this?

The max OS for all Macs with a PowerPC processor is Leopard OS 10.5.x.
If you are going to consider getting a newer, but used, Mac, here's the requirements for Lion.
Lion 10.7 System Requirements
    •    Mac computer with an Intel Core 2 Duo, Core i3, Core i5, Core i7, or Xeon processor (most models released since late 2006 - early Intel-based Macs with Core Solo or Core Duo processors aren't compatible)
    •    2GB of memory (recommend at least 4GB -- and ideally even more, as you'll see benefits in many computing tasks)
    •    OS X v10.6.6 or later (v10.6.8 recommended) for Lion download from Apple App Store; or Leopard 10.5.x if using Lion on USB drive
    •    7GB of available space (10GB recommended)
 Cheers, Tom

HT3702 So I accidentally purchased 20,000 coins from hanging with friends for $99.00 and I need to cancel that purchase. How do I do that

So I accidentally purchased 20,000 coins from hanging with friends for $99.00 and I need to cancel that purchase. How do I do that

Welcome to Apple Communities
Contact with iTunes, but probably Apple won't refund you

I am shooting aerial video with a GoPro H3 at 1080p 30fps and would like to edit videos and give them to my clients to use in as much media as possible for their advertising and marketing needs. I would like to give it to them at the highest quality all

I am shooting aerial video with a GoPro H3+ at 1080p 30fps and would like to edit videos and give them to my clients to use in as much media as possible for their advertising and marketing needs. I would like to give it to them at the highest quality allowed. What form should I save it in 'Publish and Share'? I have Premier Elements 12.

KM
Can we assume that your 1080p30 is an AVCHD.mp4 file or other?
You manually or the project automatically should set the project preset to
NTSC
DSLR
1080p
DSLR 1080p30 @29.97
(If your frame rate is really 30 instead of 29.97, then go with DSLR 1080p30 instead of DLSR 1080p30 @29.97)
See the following link for setting the project preset manually
http://www.atr935.blogspot.com/2013/04/pe11-accuracy-of-automatic-project.html
For your export
Publish+Share
Computer
AVCHD
with Presets = MP4 - H.264 1920 x 1080p30
Please let us know if you have further questions on this or need clarification on anything written.
Thank you.
ATR

Steps for performance Tuning....!!!!

Hi all,
I need your help in Performance tuning.
While we do tuning in Oracle, apart from Indexes, where clause and order by clause, what are the other points we need to check. I mean explain plan etc...
I am working as Informatica Developer, but i need to make an documents which points out what are the step we can check while doing performance tuning on SQL queries.
Thanks in advance for your help.

Hi,
have a look into these link.it may helpful to you.
When your query takes too long .
When your query takes too long ...
* HOW TO Post a SQL statement tuning request template posting *
HOW TO: Post a SQL statement tuning request - template posting
Edited by: Ravi291283 on Jul 28, 2009 4:00 AM
Edited by: Ravi291283 on Jul 28, 2009 4:01 AM
Edited by: Ravi291283 on Jul 28, 2009 4:02 AM

Privilleges for performance tuning

can we assign any specific privilleges to DBA for the performance tuning.
i dont want to give sysdba and sysopr privilleges to DBA.

The question should be why there is need to tune anything in Oracle database. What is the problem, have you defined the problem in a very clear manner ? Is there anything which is called problem or it is something other one ? What performance tuning tool you are going to use and why ?
Performance tuning is only two words, but it is very big topic; a topic on which 100 books / blogs have been written and still writing going on.
What and why are you trying to tune and what ORA you got ? As such there is no ready made role in oracle which says something like "PT_ROLE". We just issue the sql to the dictionary objects and as and when we gets privileges related error, we provides select on those sys objects to user; if he really needs though.
Regards
Girish Sharma

How to use forms trace file for performance tuning

I am trying to use forms trace file in order to find cause of forms application performance problem.
I have read the document B14032-03 where is described how to turn on tracing and how to convert binary trace file to xml or html format. However these xml/html files are useless because they only contain series of forms events, without possibility for grouping or sorting. Actually, they are like to database raw trace file. I need some tool, like tkprof for database trace, that will process xml/html file and generate some more useful format.
Further, I have tried to load forms trace file into relational database tables in order to use SQL for performance problem investigation. I have followed procedure described in document A92175-01, but without success.
Is there any way to process xml/html file with grouping, orderering or summing event duration or way to load either binary, xml or html trace file into structured data in database.

Al-Salamu Alikum user630033
It's not : elegant at all to thank people 4 No help,it's not their problem that u don't search enough, or u don't have access to db.
We should always say thank ,or 'Jazak Allah Khiern' on both cases even they could or couldn't help u.
Finally,i expect ' an appologize or even a thankful word ' and the kindness i am sure u had to publish the solution u found in order to share it with people who had same problem or at least to give them the info to get the appreciation or the thanksful word u deserve.
Rem.Never give a bad feedback to people who tried to help u.
Regards,
Abdetu..

Abap Logic for performance tuning not working when using Internal tables

Hi,
I wrote this piece of code that is working correctly that is select SUM of cost from DSO where Plant is the same for Sales Items.
LOOP AT RESULT_PACKAGE INTO rp.
SELECT SUM( /N/S_STRDCOST ) FROM /N/ADSP_DPIT00 INTO
rp-/N/S_STRDCOST
WHERE /N42/S_SALESITEM = rp-/N42/S_ITEMID AND /N42/S_PLPLANT EQ
rp-/N42/S_SOURCE.
MODIFY RESULT_PACKAGE FROM rp.
Clear rp.
ENDLOOP.
Now I try to rewrite it for performance tunning using internal table but I am getting 0 values. can't figure out whats the problem and been struggling fixing it.
TYPES : begin of ty_DSO_TABLE,
         /N42/S_STRDCOST TYPE /N/ADSP_DSPC00-/N/S_STRDCOST,
         /N42/S_ITEMID TYPE /N/ADSP_DSPC00-/N/S_ITEMID,
       end of ty_DSO_TABLE.
DATA: it_DSO_TABLE type hashed table of ty_DSO_TABLE with unique key
/N/S_ITEMID,
     wa_DSO_TABLE type ty_DSO_TABLE.
Field-symbols: <rp> TYPE tys_TG_1.
LOOP AT RESULT_PACKAGE assigning <rp>.
clear wa_DSO_TABLE.
Read table IT_DSO_TABLE into wa_DSO_TABLE with table key /N/S_ITEMID
= <rp>-/N/S_ITEMID.
if sy-subrc ne 0.
      select SUM( /N/S_STRDCOST ) into CORRESPONDING
      FIELDS OF wa_DSO_TABLE from
      /N/ADSP_DPIT00 WHERE /N/S_SALESITEM = <rp>-/N/S_ITEMID AND
      /N/S_PLPLANT EQ <rp>-/N/S_SOURCE.
     if sy-subrc eq 0.
          <rp>-/N/S_STRDCOST = wa_DSO_TABLE-/N/S_STRDCOST.
     endif.
endif.
ENDLOOP.
Any idea whats wrong with the code
thanks

Hi Vaidya,
According to the code which you have written, there is no value in table IT_DSO_TABLE when you are trying to read the values.And after the read statement you have given a condition for sy-subrc. Hence the select statement is actually not even getting executed. *Also you have not assigned the final value back to the ResultPackage.*_
So Kindly correct your code as follows:
Data: wa_dso type ty_DSO_TABLE.
LOOP AT RESULT_PACKAGE assigning <rp>.
clear wa_DSO_TABLE.
select SUM( /N/S_STRDCOST ) into CORRESPONDING
FIELDS OF wa_DSO_TABLE from
/N/ADSP_DPIT00 WHERE /N/S_SALESITEM = <rp>-/N/S_ITEMID AND
/N/S_PLPLANT EQ <rp>-/N/S_SOURCE.
if sy-subrc eq 0.
<rp>-/N/S_STRDCOST = wa_DSO_TABLE-/N/S_STRDCOST.
MODIFY RESULT_PACKAGE FROM <rp>.
endif.
ENDLOOP.
Hope this helps you.
Regards,
Satyam

Model wage type for performance pay and additional pay

Hi gurus,
my client wants performance pay and additional pay in the additional payments. I am confused what model wage types to be copied for this. i tried copying m2sf for these but the prob is if if the employee is joining in the mid of month say 15th , then if i am trying to give performane pay of 10,000 rs then it is calculating only 15 days pay n giving 5000 in the payroll n payslip.
if i try to copy the other wage types like m200,m281 n m282, i have the same problem . but if i copy m280 for both of these w.ts ,then it is giving the flat amount irrespective of the joining date of employee. but my question is does it have any implications on the calculation of the tax. coz i observed different model wage types deduct different amounts of tax. i.e if i copy m281 for performance apy n give the value as 10,000 then ,it give some x amount of tax on 10,000 similarly if i copy some other model w.t , for same amount of 10,000 it gives some other amount of tax.
im really confused ,plzz help

Hi ramm,
I have checked the w.t amount in /434
/434 Total Incom                                                   182,060.00
n my other w.t amounts are:
4MOB Mobile Reim                                                    25,000.00
4PER Performance                                                    15,000.00
5CEA Child Educa                                                       193.55
5CON Conveyance                                                      1,451.61
5HRA House Rent                                                      4,838.71
5SPL Special All                                                    19,354.84
/001 Valuation b01                          179.90
/002 Valuation b01                          179.90
/118 PTax Basis 01                                                  75,516.13
/119 PTax Basis 01                       96,774.19                  35,516.13
2CAN Canteen Ded01                                                   2,000.00-
2NOT Notice Deuc01                                                   2,000.00-
2OTH Other Deduc01                                                   1,500.00-
5BAS BASIC      01                                                   9,677.42
I dont know how to check the slabs, i am new to payroll,can u guide plzz

I am setting up my ipod touch and it won't allow me to add a phone number to the list of phone numbers for some reason, and I need to be able to get my messages. What do I do?

I can't get the number for imessage to add another number, and I need to be able to get my messages. I also can't change anything for facetime. What do I do to add a number?

An iPod (and iPad) ony have a phone number for Messages (and FaceTime) if there is an iPhone with Messages/Facetime using the same ID for Messages and facetime.
iOS and OS X: Link your phone number and Apple ID for use with FaceTime and iMessage
If you can't change the Settings that means that the Restrictions that prevent changing accounts is set. Settings>General>Restrictions

Resources for performance tuning and RAC needed

Similar Messages

Maybe you are looking for