Identify the Informix instance name Unix Database Servers Log in to your Unix database server as the Informix user. Ensure the Informix environment is correctly set. Execute this command: echo $INFORMIXSERVER This should be your Informix instance name. There should be an entry in the $INFORMIXDIR/etc/sqlhosts file that starts with the same $INFORMIXSERVER value. Note -- there may be multiple $INFORMIXSERVER values, and multiple Informix instances, on a single host.Windows Database Servers Log in to your Windows database server. Launch the Registry Editor (Start menu >> Run... >> regedit) Drill down to HKEY_LOCAL_MACHINE\ SOFTWARE\ INFORMIX\ SQLHOSTS There should be one or more sub-folders. Each sub-folder represents an Informix instance.