How to retrieve more than 30000 rows from database table using laravel 5 query?

I am unable to retrieve more than 30000 rows from a database table using laravel 5 query. The server is returning an error saying "500 Internal Server Error".

My query is as below:

DB::table('tablename')
->select('A','B','C','D')
->get();

Please help.

via Chebli Mohamed