I start postgres using the -s parameter to track the number of hits to buffer. I also set both "stats_start_collector", "stats_block_level" to true in /usr/local/pgsql/data/postgresql.conf However, I get "(typeid = 700, len = 4, typmod = -1, byval = f)" after running each query. Apparently this is not manifesting buffer hit rate. Something I did wrong?