Jim C. Nasby wrote:
> ... how many pages per bit ...
Are we trying to set up a complex solution to a problem
that'll be mostly moot once partitioning is easier and
partitioned tables are common?
In many cases I can think of the bulk of the data would be in
old partitions that are practically never written to (so would
need no vacuuming and could always use index-only lookups);
while the hot parts of large tables would be on partitions
that would need frequent vacuuming and wouldn't benefit
from index-only lookups.
In these cases, 1 bit per partition would work well,
and seems a lot easier to keep track of than bits-per-page.