Debbie is logged in to the XDB Server develop. She issues a SELECT command referencing orders.eastern.may. This request is received by the XDB Server develop. Based on the system tables on develop, outbound mapping might occur. Assuming that outbound mapping does not occur, the SELECT request referencing orders.eastern.may is sent to sales with an AuthID of debbie.
The SELECT request is then received at the XDB Server sales. After the presence of a password is checked (see the section Trusting), the SYSIBM.SYSLUNAMES table is checked and indicates requests from the Server develop are subject to inbound mapping. The AuthID of debbie and the accompanying password are checked against the SYSXDB.SYSACFUSERS table.
Next, the values in SYSIBM.SYSUSERNAMES indicate that any request from the XDB Server develop should be mapped to an AuthID of developr. Finally, the SELECT command referencing orders.eastern.may is processed with an AuthID of developr. Privileges are checked and a result is returned to debbie via the XDB Server develop.