Datatables only shows 15 data

I'm using datatables to show my data from db. The problem is the datatables only shows 15 data, even though I already add a new data, it will only shows 15 data and in the db itself there are more than 15 data. Why my datatables only show 15 data?

Here is my code:

$('#tabelpekerjaan').DataTable({
      "paging": true,
      "lengthChange": true,
      "searching": true,
      "ordering": true,
      "info": true,
      "autoWidth": true,
      "responsive": true,
      
      initComplete: function(){
        this.api()
            .columns([0])
            .every(function(){
              var column = this;
              var select = $('<select><option value="">Semua</option></select>')
                  .appendTo('#tahun')
                  .on('change',function(){
                    var val = $.fn.dataTable.util.escapeRegex($(this).val());
 
                            column.search(val ? '^' + val + '$' : '', true, false).draw();
                  });

                  column
                    .data()
                    .unique()
                    .sort()
                    .each(function(d,j){
                      select.append('<option value="' + d + '">' + d + '</option>');
                    });

                    $( select ).click( function(e) {
                 e.stopPropagation();
           });
            });
      }
    });

I have already tried suggestion from this post that I've found, Datatables only shows 15 when I have 60 , but it doesn't work...