title: Performance difference between int4 and int8 in PostgreSQL on 64 bit server
body: <p>Assuming PostgreSQL is running on a 64 bit server, what is the performance difference between an int4 (32 bit) and int8 (64 bit) column? The manual states that int4 is more efficient than int8, but if the underlying server is 64 bit, is there a practical performance difference (in terms of (1) cpu, (2) memory and (3) storage)?</p>