Understanding Job and job table in Laravel?

I am using job in laravel5.1.

First I created one table job by running artisan command as follows.

php artisan queue:table php artisan queue:table

I have written job class as well,

php artisan make:job RecordAttendanceJob --queued class RecordAttendanceJob extends Job implements SelfHandling, ShouldQueue {

}

And I dispatch this from controller as follows and working fine,

$job = (new RecordAttendanceJob($attArray)); $this->dispatch($job);

Here my doubt is,

Why using that job table, I found always empty that job table?
What is the best way to notify success/failure of jobs to user later?
I found following method as well,Queue::push(new RecordAttendanceJob($attArray)) . What is the difference between this and about dispatch job? which is better method?

http://goo.gl/eu0vej