Jeff Davis <pgsql(at)j-davis(dot)com> writes:
> Absolutely. I've got a parameter in my patch "sync_scan_offset" that
> starts a seq scan N pages before the position of the last seq scan
> running on that table (or a current seq scan if there's still a scan
> going).
Strikes me that expressing that parameter as a percentage of
shared_buffers might make it less in need of manual tuning ...
regards, tom lane