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SAP Logon Process

former_member759680
Contributor
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Hello,

Could someone please explain to me the SAP Logon process in detail, right from when we click on the SID in the SAP Logon pad to the opening of the SAP GUi window of that system.

What role to saplogon.ini, sapmsg.ini saproute.ini, etc. play... how is the request routed to the an Application server through load balancing.... etc. etc.

Thanks.

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Answers (4)

Answers (4)

former_member759680
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Thanks everyone

Former Member
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Hi,

To be able to create a connection between the front end and an instance of an SAP system, the sapgui.exe program requires various information in the form of start parameters. This parameter string is normally created by the saplogon.exe program using information about the system selected for logon. This information comes partly from the configuration files of SAP Logon(saplogon.ini), and partly from a direct request to the message server (SAPMSG.INI)of the selected system SAP Logon then starts the SAP GUI with these specifications. In this way, an instance with good performance is selected for logon in the case of a logon using logon groups.

After the transfer of the logon screen from the dispatcher to the front end, SAP GUI sends the users logon data to the instance .After the dispatcher has determined a free work process to process the logon, it transfers the logon data to this work process. The work process, in turn, checks whether the received combination of user ID and password is known to the system using a request to the database . A positive response from the database prompts the work process to return the initial screen of the system to the front end.During a logon session, the assignment of the user to the instance is unique.Only during a new logon can the user possibly be assigned to a different instance by the message server.

Samrat

former_member759680
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This link only provides wat happens on the SAP GUI. I want to know how the login hapens in teh background at OS level, DB level, Message server, dispatcher, etc.

Former Member
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Hi,

Process of a system loon:

To create connection between the front end of an end user and an instance of an SAP system, the sapgui.exe program requires verous start parameters.This parameter string is created by saplogon.exe program using information about the system selected for logon. This information partly comes from configuration files of SAP logon, and parly from a direct request to the message server of the selected system. SAP logon then starts the SAP GUI with this specifications.

After the transfer of the logon screen from the dispatcher to the front end, SAP GUI sends users logon data to the instance.

After the dispatcher has determined a free work process to process the logon, it transfer the logon data to this work process.The work process, in turn , checks whether the received combination of user id and password is known to the system using a request to the database. A positive request from database prompts the work process to return the initial screen of the system the front end.

During a logon session, the assignment of the user to the instance is unique. Only during a new logon a can the user possibly be assigned to a different instance by the message server.

Hope this will help you. Please let me know if any other details are required.

Jay

former_member759680
Contributor
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Could you explain how the Message server(on the SCS for ABAP+JAVA) queries the app servers for load balancing.

Also, how does the app server connect and send the initial logon screen to the Frontend Computer.

Thanks.

Former Member
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Hi Gautam,

Can Your please check this link below:

http://help.sap.com/erp2005_ehp_03/helpdata/EN/4f/472e42e1ef5633e10000000a155106/frameset.htm

Go through this link provides you all the info.

regards,

S.Rajeshkumar