Prevents the database server from becoming the default database server.
When a database server starts, it attempts to become the default database server on that computer. The first database server to start when there is no default server becomes the default database server. Shared memory connection attempts on that computer that do not explicitly specify a database server name connect to the default server.
Specifying this option prevents the database server from becoming the default database server. If this option is specified, clients that do not specify a database server name cannot find the database server over shared memory. The -xd option also prevents the database server from using the default TCP port. If a TCP port is not specified, the database server uses a port other than port 2638.