Entering content frame

Object documentation X Server Locate the document in its SAP Library structure

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.

Note

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.

Starting and Stopping 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

 

 

 

Leaving content frame