Pdo session handler

app/config/config.yml

@@ -42,8 +42,8 @@ framework:
     session:
         name: ftth_session
         # http://symfony.com/doc/current/reference/configuration/framework.html#handler-id
-#        handler_id: session.handler.pdo
-        handler_id: session.handler.native_file
+        handler_id: session.handler.pdo
+#        handler_id: session.handler.native_file
         save_path:   "%kernel.root_dir%/../var/sessions/%kernel.environment%"
     fragments:       ~
     http_method_override: true