Hello Görgen
The Loc-RIB, and the adj-RIB-Out are both constructs within a BGP router that exist whether you enable soft reconfiguration or not. You can issue the show ip bgp command alone, or with the advertised-routes keyword and see these constructs at any time.
The adj-RIB-In however does not exist if you have not enabled soft reconfiguration. You can attempt to see this construct with the received-routes keyword:
R1#show ip bgp neighbors 192.168.12.2 received-routes
% Inbound soft reconfiguration not enabled on 192.168.12.2
When you enable soft reconfiguration, the router will allocate memory to create the adj-RIB-In as well. This is why this feature uses up more resources.
I hope this has been helpful!
Laz