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 Member]

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