实时数据验证或搜索

I would like to know is there any best way to create realtime data checker from page to backend like for example PHP to MySQl aside from sending an Ajax every 5 seconds using these lines of code.

  setInterval(function(){
      $.ajax({
          url: "url",
          type: "post",
          data: {sys_id: <some id>},
          success: function(returnedValue){
              `some dom manipulation here`;
          }
      })    
  },5000);

Note that this is just a sample ajax execution.