my %db_conn = (
    a_manager => [ 'DBI:Oracle:host=hostname1;sid=ABCDB01;port=1300', 'a_manager', 'a_manager' ],
    b_manager => [ 'DBI:Oracle:host=hostname1;sid=ABCDB01;port=1300', 'b_manager', 'b_manager' ],
    c_manager => [ 'DBI:Oracle:host=hostname1;sid=ABCDB01;port=1300', 'c_manager', 'c_manager' ],
    d_manager => [ 'DBI:Oracle:host=hostname1;sid=CBADB01;port=1300', 'd_manager', 'd_manager' ],
);