Everything is good, working, but is this a good way to refresh some data to display in the index, any suggestion will help

$(document).ready(function () {

setInterval(function () {
    $.ajax({
        url: 'dashboard/reserv_load_today.php',
        success: function (data) {
            var json = JSON.parse(data);
            $('#reserve_today').html(json.TODAY);
        }
    })

    $.ajax({
        url: 'dashboard/last_update.php',
        success: function (data) {
            var json = JSON.parse(data);
            $('#last_update').text(json.LAST);
        }
    })
}, 3000);

});