ho risolto in questo modo:
codice:
$(document).ready(function() {
    $('#datatable').dataTable({
        "paginate": true,
        "sort": false
    });
    // start and stop refresh tbody, sulla ricerca
    $("input[type='search']").focusout(function() {
        startCycle();
    });
    $("input[type='search']").focusin(function() {
        stopCycle();
    });
});

function myTimer() {
    $("tbody").load(location.href+" tbody>*","");
}
var cycleTimer;
function startCycle() {
   clearInterval(cycleTimer);
   cycleTimer = setInterval(function(){ myTimer() }, 1000);
}

// start to automatically cycle slides
startCycle();
function stopCycle() {
   clearInterval(cycleTimer);
   setTimeout(startCycle, 500000); // restart after 5 seconds
}
Spero possa servire a qualcuno.
Grazie.