how to change the number of total rows in datatable - datatable

Question

I'm developing an application with Symfony 3 in which I'm using datatables.
to avoid getting all rows of database, I'm using doctrine's paginator. so i want the datatable will get 100 elements first, then when I click in next button it will charge the next 100 elements.
My problem is that when setting datatable with first 100 elements, I can't click on next button. ( because it's showing the 100 elements so there are no other elements for it). I want to tell it that I have more than 100 elements. so how can I do it.
My table :
<table class="table table-striped table-bordered dt-responsive nowrap" cellspacing="0" width="100%"
id="table_city">
<thead>
<tr>
<th>Code</th>
<th>Name</th>
<th>Region</th>
<th>Country</th>
<th class="no-sort">Actions</th>
</tr>
</thead>
<tbody>
{% for core_city in core_cities %}
<tr>
<td>{{ core_city.code }}</td>
<td>{{ core_city }}</td>
<td>{{ core_city.CoreRegion }}</td>
<td>{{ core_city.CoreRegion.coreCountry }}</td>
<td class="datatable_td_buttons">
<a class="m-portlet__nav-link btn m-btn m-btn--icon m-btn--icon-only m-btn--pill"
title="Show" href="{{ path('core_city_show', { 'id': core_city.id }) }}">
<i class="la la-search"></i>
</a>
<a href="{{ path('core_city_edit', { 'id': core_city.id }) }}"
class="m-portlet__nav-link btn m-btn--icon m-btn--icon-only m-btn--pill" title="Edit">
<i class="la la-edit"></i>
</a>
<a href="{{ path('core_zip_code_import_by_city', { 'id': core_city.id } ) }}"
class="m-portlet__nav-link btn m-btn--icon m-btn--icon-only m-btn--pill"
title="Import Zip Code">
<i class="la la-upload"></i>
</a>
</td>
</tr>
{% endfor %}
</tbody>
</table>

Answer 1

I found solution :
$('#example').dataTable( {
"infoCallback": function( settings, start, end, max, total, pre ) {
return start +" to "+ end;
}
} );