What is the concept of load-balancing

Hi All,
can any one explain me the concept of load-balancing
Thanks.

In simple words, when one server within a load-balancing setting (where more servers are able to run the same process) has too many requests to process, it will off-load a number of those requests to other servers in the same setting. This will be done in a way that it will be transparent to the final user, meaning that the user who has made the request does not know or perceive which server has processed his request.

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A question about the SharePoint services load balancer

Let's consider a farm with one WFE and two app servers, A and B. Both app servers are running the Managed Metadata Service (MMS).
User requests a page from the WFE, which talks to the database server. The operation needs information from the MMS, so the WFE requests information from the round robin load balancer for SharePoint web services. Let's say server A is down.
Here's my question - what happens next?
a) The round robin load balancer tells the WFE the MMS is on servers A & B. The WFE tries server A, fails, and returns a failure.
b) The round robin returns servers A & B. The WFE tries server A, which fails. The WFE then tries server B.
c) The round robin returns either A or B, depending on which is next in rotation. The WFE tries the server returned. If the server returned is A, the WFE returns a failure.
d) The round robin returns either A or B, depending on which is next in rotation. The WFE tries the server returned. If the server returned is A, the WFE queries the round robin service again.
e) The round robin knows server A is down, returns only server B to the WFE.
Philo Janus, MCP Bridging business & Technology: http://www.saintchad.org/ Telecommuter? http://www.homeofficesurvival.com/ Author: Pro InfoPath 2007 & Pro InfoPath 2010 Pro PerformancePoint 2007 Pro SQL Server Analysis Services 2008 Building Integrated
Business Intelligence Solutions

When a Service Application is down, the application load balancer removes that endpoint from the load balancer. When it becomes available again, it adds it back. This way the WFE would just contact the MMS endpoint that was available, not try and timeout
against an unavailable endpoint.
Trevor Seward
Follow or contact me at...
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This post is my own opinion and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.

What are the steps for loading master data

Hello
what are the steps for loading master data? i want to learn about loading all master data and the steps to choose the best way to load the data.
if anyone has documents please send me the documents i will be really greatful
[email protected] thanks everyone
Evion

Hi Heng,
Download the data into a CSV file.
Write a program using GUI_UPLOAD to upload the CSV file and insert records.Chk the below link for example
http://www.sap-img.com/abap/vendor-master-upload-program.htm
Reward Points for the useful solutions.
Regards,
Harini.S

What is the concept of view in material master?

Hello sap gurus
Some quetions regarding Material Master
what is the concept of views in material master ?
what is determined by specifying industry sector in material master ?
To sell material which views are material are maintened in Material master?
Regards
Amit

Hi,
Material master for finished ggods is related with SD, MM & PP departments. If you carefully go through the various screens in MM record you will realize the importance of the respective fields and the department to which they belong.
1.Suppose Base unit of measure in Basic data 1 screen. The production people will keep the stock of the item using this UOM.
2. In Sales:Sales Org.1 screen we have sales unit in which we will sell the material.
3. Then we have the plant data in which we enter the delivering plant. Also the taxes are determined from the plant so we have the settings for taxes also - whether this material is fully taxable/50% tax/Tax exempted.
4. Then we have purchasing screen in which the data like the purchasing group, variable units,etc are entered. This will effect the purchasing cycle when we are procuring a material from outside. This is related to MM.
5. The we have MRP, this is related to PP as to how to manufacture the product, the MRP type, the strategy group - whether it is MTO/MTS like that.
5. Sales:Sales Org.2 screen - Here we mainatin the account assignment group which is very important as far as the generation of the accounting document is concerned. This triggers the system where to post the value in which G/L account. Accounting document is generated when we create the invoice in VF01 & save it.
6. Work scheduling - Related with the sceduling of the production as to whether underdelivery or overdelivery is allowed, the storage location
7. Quality - Here you can select for a particular finished item where where it has to be checked for quality during its journey from the raw material stage to the finished goods store as a finished item.
8. Accounting - Related to accounting, product costing, total value of the stock in hand, etc. Also related with FI & PP
So all the screens have data which effects one or more modules for the proper functioning of the system to give the optimum results.
Industry Sector:
Key that specifies the branch of industry to which the material is assigned.
Use
When you create a material master record, the industry sector you specify determines
1. which screens appear and in what order
2. which industry-specific fields appear on the individual screens
Screens for Sales:
Sales:Sales Org.1, Sales:Sales Org.2. But other screens also have data which is related to sales. You cannot just maintain the sales views and save the master. It has to be properly linked with the other modules also for the proper functioning of the system. That is why the system is called as "Enterprise Resource Planning" You have to paln the resources of your company and these resources are related with all the modules.
Reward points if solution helps.
Regards,
Allabaqsh G. Patil

Hi All,What is the concept of table control in bdc

Hi All,What is the concept of table control in bdc .Can u please explain in brief.How we have to handle the logic for va01 transaction .
Thanks&regards.
Bharat

Hi Kaushik Datta ,
 I already know for me51 ,but i am getting the problem for va01 while populating the item details in to the table control. The code which i have generated is :
please see the code and tell me where i should increment the counter for populating the item details
report ZBKVA01Y
 no standard page heading line-size 255.
include bdcrecx1.
parameters: dataset(132) lower case.
 DO NOT CHANGE - the generated data section - DO NOT CHANGE ***
If it is nessesary to change the data section use the rules:
1.) Each definition of a field exists of two lines
2.) The first line shows exactly the comment
 '* data element: ' followed with the data element
 which describes the field.
 If you don't have a data element use the
 comment without a data element name
3.) The second line shows the fieldname of the
 structure, the fieldname must consist of
 a fieldname and optional the character '_' and
 three numbers and the field length in brackets
4.) Each field must be type C.
DATA: BEGIN OF IT_DUMMY OCCURS 0,
 TEXT(1000),
 END OF IT_DUMMY.
Generated data section with specific formatting - DO NOT CHANGE ***
data: begin of IT_HEADER OCCURS 0,
data element: AUART
 AUART_001(004),
data element: VKORG
 VKORG_002(004),
data element: VTWEG
 VTWEG_003(002),
data element: SPART
 SPART_004(002),
data element: BSTKD
 BSTKD_005(035),
data element: BSTDK
 BSTDK_006(010),
data element: KUNAG
 KUNNR_007(010),
data element: KUNWE
 KUNNR_008(010),
data element: ABHOZ
 ABHOV_009(008),
data element: ABHOZ
 ABHOB_010(008),
data element: PRSDT
 PRSDT_011(010),
END OF IT_HEADER.
DATA: BEGIN OF IT_ITEM OCCURS 0,
data element: MATNR
 MABNR_01_012(018),
data element: KWMENG
 KWMENG_01_013(019),
 end of IT_ITEM.
*DATA: DATE(10) TYPE C.
*DATA: I_DATE TYPE SY-DATUM.
*DATA: I_YEAR(4) TYPE C,
 I_MONTH(2) TYPE C,
 I_DAY(2) TYPE C .
*DATA:
End generated data section ***
start-of-selection.
CALL FUNCTION 'UPLOAD'
EXPORTING
CODEPAGE = ' '
FILENAME = ' '
FILETYPE = ' '
ITEM = ' '
FILEMASK_MASK = ' '
FILEMASK_TEXT = ' '
FILETYPE_NO_CHANGE = ' '
FILEMASK_ALL = ' '
FILETYPE_NO_SHOW = ' '
LINE_EXIT = ' '
USER_FORM = ' '
USER_PROG = ' '
SILENT = 'S'
IMPORTING
FILESIZE =
CANCEL =
ACT_FILENAME =
ACT_FILETYPE =
TABLES
 DATA_TAB = IT_DUMMY
EXCEPTIONS
CONVERSION_ERROR = 1
INVALID_TABLE_WIDTH = 2
INVALID_TYPE = 3
NO_BATCH = 4
UNKNOWN_ERROR = 5
GUI_REFUSE_FILETRANSFER = 6
OTHERS = 7
IF SY-SUBRC <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
 WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
*perform open_dataset using dataset.
LOOP AT IT_DUMMY.
IF IT_DUMMY-TEXT+0(1) = 'H'.
IT_HEADER-AUART_001(004) = IT_DUMMY-TEXT+1(4).
data element: VKORG
IT_HEADER-VKORG_002(004) = IT_DUMMY-TEXT+5(4).
data element: VTWEG
IT_HEADER-VTWEG_003(002) = IT_DUMMY-TEXT+9(2).
data element: SPART
IT_HEADER-SPART_004(002) = IT_DUMMY-TEXT+11(2).
data element: BSTKD
IT_HEADER-BSTKD_005(035) = IT_DUMMY-TEXT+13(35).
data element: BSTDK
IT_HEADER-BSTDK_006(010) = IT_DUMMY-TEXT+48(8).
data element: KUNAG
IT_HEADER-KUNNR_007(010) = IT_DUMMY-TEXT+56(10).
data element: KUNWE
IT_HEADER-KUNNR_008(010) = IT_DUMMY-TEXT+66(10).
data element: ABHOZ
IT_HEADER-ABHOV_009(008) = IT_DUMMY-TEXT+76(6).
data element: ABHOZ
IT_HEADER-ABHOB_010(008) = IT_DUMMY-TEXT+82(6).
data element: PRSDT
IT_HEADER-PRSDT_011(010) = IT_DUMMY-TEXT+88(8).
APPEND IT_HEADER.
CLEAR IT_HEADER.
ELSEIF IT_DUMMY-TEXT+0(1) = 'I'.
data element: MATNR
IT_ITEM-MABNR_01_012(018) = IT_DUMMY-TEXT+1(18).
data element: KWMENG
IT_ITEM-KWMENG_01_013(019) = IT_DUMMY-TEXT+19(15).
APPEND IT_ITEM.
CLEAR IT_ITEM.
ENDIF.
ENDLOOP.
perform open_group.
LOOP AT IT_HEADER.
perform bdc_dynpro using 'SAPMV45A' '0101'.
perform bdc_field using 'BDC_CURSOR'
 'VBAK-SPART'.
perform bdc_field using 'BDC_OKCODE'
 '/00'.
perform bdc_field using 'VBAK-AUART'
 IT_HEADER-AUART_001.
perform bdc_field using 'VBAK-VKORG'
 IT_HEADER-VKORG_002.
perform bdc_field using 'VBAK-VTWEG'
 IT_HEADER-VTWEG_003.
perform bdc_field using 'VBAK-SPART'
 IT_HEADER-SPART_004.
perform bdc_dynpro using 'SAPMV45A' '4001'.
perform bdc_field using 'BDC_OKCODE'
 '/00'.
perform bdc_field using 'VBKD-BSTKD'
 IT_HEADER-BSTKD_005.
perform bdc_field using 'VBKD-BSTDK'
 IT_HEADER-BSTDK_006.
perform bdc_field using 'KUAGV-KUNNR'
 IT_HEADER-KUNNR_007.
perform bdc_field using 'KUWEV-KUNNR'
 IT_HEADER-KUNNR_008.
perform bdc_dynpro using 'SAPMSSY0' '0120'.
perform bdc_field using 'BDC_CURSOR'
 '04/05'.
perform bdc_field using 'BDC_OKCODE'
 '=CHOO'.
perform bdc_dynpro using 'SAPMV45A' '4001'.
perform bdc_field using 'VBAK-ABHOV'
 IT_HEADER-ABHOV_009.
perform bdc_field using 'VBAK-ABHOB'
 IT_HEADER-ABHOB_010.
perform bdc_field using 'VBKD-PRSDT'
 IT_HEADER-PRSDT_011.
perform bdc_field using 'BDC_CURSOR'
 'RV45A-KWMENG(01)'.
perform bdc_field using 'RV45A-MABNR(01)'
 IT_ITEM-MABNR_01_012.
perform bdc_field using 'RV45A-KWMENG(01)'
 IT_ITEM-KWMENG_01_013.
perform bdc_transaction using 'VA01'.
*enddo.
ENDLOOP.
perform close_group.
*perform close_dataset using dataset.
Thanks&regards.
Bharat .

What is the concept behind using table PA0002 and structure p0002.

Hi,
What is the concept behind using table PA0002 and structure p0002.
Many times, I have seen Looping at structure e.g. p0002, p0006 etc. and data is processed and also seen Looping at table PA0002, PA0006 etc. with further appropriate subtypes if any to retrieve a value and process the same.
In which context tables like PA,HRP,IT etc. are used and structures p0001,p0002 etc. are used.
Regards,
Ameet

HI,
As mentioned that that Structure Pnnnn is user as a internal tablw when a LDB is used.
Ex.
TABLES: PERNR.
INFOTYPES: 0001.
GET PERNR.
    PROVIDE * FROM P0001 BETWEEN PN-BEGDA AND PN-ENDDA.
    WRITE: / P0001-PERNR,
              P0001-STELL,
              P0001-BEGDA,
              P0001-ENDDA.
    ENDPROVIDE.
Here it is important to declare the infotypes you want to read and so the system will create internal tables ex. P0001.
Tables PA0001 are database table with following fields
MANDT
.INCLUDE PAKEY
.INCLUDE PSHD1
.INCLUDE   PS nnnn
Thanks,
Poonam.

What is the concept of Active directory in HFM

Hi Experts
What is the concept of Active directory in HFM?
regards
Dev

Hi Dave,
Not sure if this is your exact requirement... but might be helpful.
The concept of Active directory is that users can login to HFM application with the windows credentials. To make that work you should first need to configure.
Please refer the below link, page 23:
http://docs.oracle.com/cd/E17236_01/epm.1112/hss_admin_1112200.pdf
Hope this helps,
Thank you,
Charles Babu J

What is the concept of setup tables in LO extraction?

Hi,
what is the concept of set up tables in LO EXTRACTION?
GIVE ME COMPLETE DETAILS and how to run deltas? I want step by step procedure.
Thanks in advance.
ravi.

Ravi,
I think the blog series by Robert Negro about LO is the best available information.
SDN thread:
/community [original link is broken]
It would be nice if there is any help.sap documentation available.
Raj.

What is the concept behind MASTER_IDOC_DISTRIBUTE

What is the concept behind MASTER_IDOC_DISTRIBUTE ?

Hi Manjunath,
Please check the Documentation of the Function Module in SE37
This function module is the interface from the application to the ALE layer on the outbound side. The application can pass an IDoc, the so-called master IDoc, as an internal table using the parameters MASTER_IDOC_CONTROL and MASTER_IDOC_DATA.
This IDoc is then converted into one or communcation IDocs and stored in the ALE layer. IDocs for which no errors occurred are passed to dispatch control.
In the table parameter COMMUNICATION_IDOC_CONTROL the header records for the communication IDocs created are retturned. You can tell whether processing was successful from the field STATUS.
A COMMIT WORK must be dispatched in the calling program, otherwise the IDocs may not be dispatched.
Best regards,
raam

Please tell me what is the concept of GO URL

Hi All,
could you please tell me what is the concept of GO URL . coudl you please give me how can i use this ?
Thanks in advance .

you could try this link: http://oraclebizint.wordpress.com/2007/07/30/customizing-obi-ee-%E2%80%93-go-url-parameters/ of Venkat
Edited by: Remc0 on Sep 9, 2008 9:36 AM

What are the frequent data load errors in production support?

what are the frequent data load errors in production support?

It is a long list. Here is some of them.
1. Idoc not arriving from source system.
2. previous processes failed.
3. change run unsucessful or did not run properly and data in master data is messed up.
4. invalid characteristics in the data.
5. Duplicate records found.
and on and on.
Ravi Thotahdri

Pending Licenses : What is the concept behind pending licenses ?

hi,
I am seeing pending licenses in device license in call manager 8.5.1
a) How can i filter devices whose licenses are pending.
b) What is the concept behind pending licenses.

Thanx [email protected]
   By gettign total no. of pending DLU's = some units apart form total alloted DLU's , consumed units and free units.
   What i understand is
    total alloted DLUS's = total consumed DLU + total free DLU + Pending DLU's.
   thus one pending licenseis as good as consuming a license ?
   M i thinking in correct direction,if yes how can i free these pending DLU's .

What ru the concepts to cover for beginner in sap abap

Hi fr , This is kumar , what ru the concepts to cover for beginner in sap abap

Hi Kumar,
SAP has a certification program for ABAP, according to which following courses are supposed to be covered. If you will try to cover this course, you will be at a level where you can independently program.
1. SAP Technologies
-> SAP systems
-> Technical structure of SAP WAS
2. ABAP Workbench Basics
3. Advanced ABAP
4. ABAP Objects
5. ABAP Dictionary
6. List creation techniques(including Object oriented ALV)
7. Dialog Programming
8. Database Changes
9. Enhancements and Modifications
-> Changes to standard SAP system
-> Personalization
-> Enhancements to ABAP Dictionary elements
-> Enhancements via customer exits
-> Business transaction events
-> BADI
-> Modifications
Following are some links which will help you to cover above points.
http://www.sap-img.com/F
http://www.sappoint.com/abap.html
http://www.sts.tu-harburg.de/teaching/sap_r3/ABAP4/ranges.htm
http://www.sapdevelopment.co.uk/programs/programsalv.htm
http://www.geocities.com/victorav15/sapr3/abapfun.html
http://abap4.tripod.com/SAP_Functions.html
http://sapr3.tripod.com/abap011.htm
http://abap4.tripod.com/Other_Useful_Tips.html
http://www.sap-img.com/abap/how-to-change-the-development-class.htm
Hope this helps you.
PS If the answer solves your query, plz close the thread by rewarding points to each reply.
Regards

Help choose the appropriate etherchannel load balance method

Hi
I have 2 network architectures :case A and case B (found architecture below)
Case A : one server connected on the switch on each site
Case B : 3 server connected on the switch behind a router on each site
2 site are connected by 2 wireless link :each wireless link have 105 Mbps bandwith (I absolutly need the agregate bandwith 210)
Site headquarter is the principal site and site backup is use to backup data located on the principal site
I use Gbit cisco 2960 switch
I use etherchannel to agregate the 2 switch port (port 1 and port 2) where the 2 wireless link are connected
I configure src-mac for case A but all trafic is send only on one wireless link .
Please help me to choose the more appropriate load balance method to load balance traffic between the 2 link for the case A and for the case B
Please advise
Thanks in advance

Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
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In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
Your Case A might be handled by port hashing, but unfortunately most Cisco platforms don't support it.
Your Case B isn't much better, as you only have 3 hosts on each side, and according to your drawing, they are behind routers, so you don't want to use MAC hashes. If you don't have port hashing, next best choice might be src-dest-IP hashing. Again, though, with just 3 hosts, your distribution will likely not be very balanced, especially over shorter time intervals.
To obtain best utilization of your links, you need some kind of better link bonding, such as MLPPP (unfortunately, usually won't scale to FE rates) or a hardware MUX. Next best option, if you could route across the links, would be something like Cisco's OER/PfR which can dynamically load balance.

Modifying the goto URL - load balancer configuration

Hi,
I am trying to find the location of the display.template which I can modify to change the "goto" parameter URL.
Objective:
When I hit my loadbalancer URL "http://172.11.124.23/portal"
It basically can forward the request to ports 8080,8081 or 8082.
but I see the following in the browser after the redirection
http://myportal.domain.corp:8080/amserver/UI/Login?goto=http://172.11.124.23/portal/dt
instead of
http://myportal.domain.corp:8080/amserver/UI/Login?goto=http://myportal.domain.com/portal/dt
so basically I get the acess manager login page but after authentication it goes back to the loadbalancer since the goto URL is'nt right.and load balancer again sends the request back to access manager.So it kinda loops back and forth betn load balancer and access manager.
I read on the forum which says display.template should be modified to correct the goto URL.
I am working in linux env.I tried changing the display.template at the following location but I dont see what I want.
/var/opt/sun/portal/portals/portal1/desktop/default/LoginProvider
Can you point me in the right direction.!
Thanks,
Deepak.

c'mmon guys...help me..its urgent !!!!

What is the concept of load-balancing

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