SET DEFINE ON

PROMPT &3 &4 &1

-- CONN &1/&2@(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(COMMUNITY=TCP.WORLD)(PROTOCOL=TCP)(HOST=&3)(PORT=1521))(ADDRESS=(COMMUNITY=TCP.WORLD)(PROTOCOL=TCP)(HOST=&3)(PORT=1526)))(CONNECT_DATA=(SID=&4)));

CONN &1/&2@(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(COMMUNITY=TCP.WORLD)(PROTOCOL=TCP)(HOST=&3)(PORT=1521)))(CONNECT_DATA=(SID=&4)));

-- SET SQLPROMPT '&&3 &&4 &&1> '
-- @LOGIN;