Differnce between central instance ,dialog instance and application instanc

Hi all
Please explain me what is central instance. what is it differnce betwenn the
other instances like dilaog instance ,apllication instance.
What is the exact use of having many instances ?
regards
Sanjeev.S

Hi Sanjeev,
First of all let me Clarify between Cental instance(CI)and Central Service instance(SCS). When you install NW04/NW04s systems on WIndows, when you open you windows console, you would first find the SID name that you have installed and when you expand this you'll find 2 instances. When you expand the first instance you'll find that there are message server and Enqueue server listed. This instance is called as Central Service instance or simply called SCS. You can look at the folder structure /usr/sap/<SID>/.
Now the second instance is called as Central instance, when expanded you would see a SDM, a dispatcher and a server node. This is the instance which processes all your requests.
Now answering your question about Dialog instance, When the CI is overloaded, i.e. your dispatcher is overloaded and your server is overloaded , you would install a dialog instance, which means that the database need not be installed for the Dialog instance and it can be on any system. While installing the Dialog instance it would ask you which Cental instance I have to refer, then you would be giving the necessary system to which you have created a dialog instance.
Giving a graphical view,
SID < J2E>
< DATABASE>
<hostname>00  message server
                        enqueue server
<hostname>01  SDM
                        dispatcher
                        server0
This is your one SAP system. Now you feel that this system is overloaded with lot of users, any there are many user who will be logging in again, so what you would do is install a dialog instance which would be referiing to J2E database but will have its own dispatcher and server0. SDM, message server and enqueue server are only one per systems.
Now the dialog instance for J2E would look like this
SID < K2E>
<hostname2>01 dispatcher
                         server0
Dialog instance is mainly for load balacing, now you can access the database of J2E by typing a different URL i.e. of K2E and hostname2 but still accees the data of the J2E. The communication between Dialog and Central instance is thru message server.
In case you find it difficult to push thru, please let me know..

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