SAP Logon Process

[former_member759680]

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.

[former_member759680]

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]

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]

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.