8.2 and 8.3 postgresql.conf oddity

Hi -bugs,

I just noticed something odd in the Planner constants part of the 8.2
and 8.3 postgresql.conf:
# - Planner Cost Constants -

#seq_page_cost = 1.0                    # measured on an arbitrary scale
#random_page_cost = 4                  # same scale as above
#cpu_tuple_cost = 0.01                  # same scale as above
#cpu_index_tuple_cost = 0.005           # same scale as above
#cpu_operator_cost = 0.0025             # same scale as above

The "same scale as above" while we have an "arbitrary scale" on the
first line is a bit weird.

8.1 was:
random_page_cost = 2                    # units are one sequential page fetch
                                        # cost
cpu_tuple_cost = 0.01                   # (same)
cpu_index_tuple_cost = 0.001            # (same)
cpu_operator_cost = 0.0025              # (same)

Which seems better.

AFAIK, the unit of random_page_cost and cpu_*_cost is now seq_page_cost.

--
Guillaume