Hi Paulo,

It's a pity there's no method to only update some table cells or columns. If you have large data and worry about inefficiency DataTables widget has a serverSide property that only retrieve data for the current page (10, 20, or 50 rows, etc):

DataTables documentation

serverSide example

Using this property you can also set an interval to automatically update the table:

DataTables::create(array(
    "name" => "MyTable",
    "serverSide" => true,
    ...
    "onReady" => "function() {
        setInterval( function () {
            MyTable.ajax.reload(); //MyTable is the name as well as js object of this DataTables
        }, 30 * 1000 ); // auto refresh data every 30 seconds
    }"
));

Let us know if you have any question. Tks,