SAP BASIS : HOW THE USER SAP LOGON PROCESS WORKS?

Step 1) Once a user clicks on the SAP system from GUI, the user request is forwarded to Dispatcher.

Step 2) Request is stored in Request queues first. Dispatcher follows First in First out rule. It will find free work process and if available will be assigned.

Step 3) As per user request, particular work process is assigned to user. For example, when user login to the system then Dialog work process is assigned to the user.

Step 4) Once user is assigned the dialog workprocess then user authorizations, user’s current setting are rolled in to work-process in shared memory to access user’s data.Once dialog step is executed then user’s data is rolled out from workprocess. Thus shared memory will be cleaned and other user’s data can be saved in shared memory area.

Step 5) First work process will find the data in the buffer. If it finds data in buffer then there is no need to retrieve data from database. Thus response time is improved and this process is called hit.If it does not find the data in buffer then it will find the data in database and this process is called miss. Hit ratio should be always higher than miss ratio. It improves the performance of system .

Step 6) Other requested data is queried from the database and once the process is complete,the result is sent back to GUI via dispatcher.

Step 7) At the end user’s data is removed from shared memory so the memory will be available to other users.This process is called roll-out.

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[riteshagrawal]

You have explained SAP logon process very nicely but I have below three questions:
1) What is the role of message server and enqueue service during logon?
2) Lets say I logged in successfully in system means task handler got positive response from roll area that my user and p/w are correct but when exactly switch of WP happen from Dia to BG if I want to execute one job?
3) Will all users data present in Role area user context, will it be stored in DB in USR02 table and roll out from DB to user context?