The X Server is the communication instance of SAP DB software. It is required, above all, if the individual software components are on different hosts: Database applications and SAP DB tools communicate with a database instance installed on a remote host using the X server also running on the remote host (see Architecture of the Database Manager and Architecture of the Loader).
Under UNIX operating systems, the X server is also used to allow communication with the DBM Server within a host.
SQL connections on UNIX systems and all connections within hosts under Microsoft Windows use Shared Memory. If you nevertheless want to force the use of the X server, specify the option –n localhost when logging on to the database instance.
The following prerequisites must be fulfilled to allow communication using the X server:
· On Microsoft Windows operating systems, the X server is registered as the system service XServer. This service must be active. An additional thread within the X server process is created with every successful connection using the X server.
· Under UNIX operating systems, the X server must be running in the background as the process vserver. An additional child process is started for every successful connection using the X server.
x_server [<option>] start|stop
You can specify the following options when calling the X server:
Option |
Explanation |
-Y |
Suppresses the communication through the NI server, which is only relevant for SAP Support |
-F |
Suppresses the determining of DNS entries and therefore speeds up the creation of connections |
-S <service|port> |
Specifies an alternative list port |