## Network Communication

To establish a connection to a database on a remote computer, database applications and database tools use the MaxDB X Server running on the remote computer (see the X Server documentation). The X Server is concurrently available to all database instances: even if several database instances are installed on one computer, only one X Server ever runs.

To secure the connection between the client and the X Server, SAP customers can use SSL/TLS (see Data Encryption).

Connections to database instances on the local computer use shared memory.

If you want to force the database to establish the connection via the X Server nonetheless, specify localhost as the database computer when you log on to the database instance.

### Example

The two database instances HOTELDB and SHOPDB are installed on computer ROME.

· A user on computer PARMA uses the Database Manager GUI (DBMGUI) to access the database instance HOTELDB via the X Server on computer ROME.

· A second user, on computer GENUA, uses the SQL Studio to access the database instance SHOPDB via the same X Server on computer ROME.

· A third, local, user uses the Database Manager GUI to access the database instance HOTELDB without using the X Server.

Examples of the Communication Between Clients and Database Instance

See also:

Technical System Landscape

X Server, Ports and Protocols of the X Server