What do you mean by client server architecture and is it
always two tire architecture?
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Answer Posted / abhishek
IN CLIENT SERVER ARCHITECTURE YOUR PRESENTATION SERVER THAT
IS THE SAP GUI INSTALLED ON THE PC ACTS AS THE CLIENT THE
REQUESTS NOW GOES TO THE APPLICATION SERVER THE CONNECTION
B/W PRESENTATION SERVER AND APPLICATION SERVER IS MADE
THROUGH DISPATCHER WHICH RESIDES ON APPLICATION SERVER THE
DISPATCHER ALLOCATES THE REQUEST TO THE WORK PROCESS
DEPENDING ON ITS TYPE FOR EXAMPLE IF IT IS DIALOG REQUEST
THEN THE REQUEST IS ALLOCATED TO DIALOG WORK PROCESS AND IF
IT IS A BACKGROUND JOB THEN IT IS EXECUTED VIA DIALOG WORK
PROCESS SIMILARLY OTHER TYPES OF REQUESTS ARE HANDLED BY
SPOOL ENQUEUE WORK PROCESS ETC NOW THE REQUEST GOES TO THE
DATABASE THROUGH THE DATABASE SERVER THE DATA IS FETCHED AND
THE REQUEST IS FULFILLED OTHERWISE SOMETIMES THE DATA IS
ALSO FETCHED FROM BUFFERS (TEMPORARY STORAGE AREA) SO AS TO
REDUCE THE LOAD ON DATABASE SERVER NOW AFTER THE DATA HAS
BEEN FETCHED IT IS ENT BACK TO THE APPLICATION SERVER AND
THE TO THE PRESENTATION SERVER (SAP GUI) WHICH FORMATS THE
DATA AND OUTPUTS THE DATA . THIS APPROACH IS CALLED AS 3
TIER CLIENT SERVER ARCHITECTURE .
AWARD POINTS IF USEFUL.......
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