On Wed, Jul 22, 2015 at 8:19 PM, Alvaro Herrera
<alvherre@2ndquadrant.com> wrote:
>
> Not sure what Jim meant. Maybe he meant to be aware of when spilling to
> disk happens? Obviously, things become slower, so maybe you need to
> consider it for progress reporting purposes.
>
Perhaps the m_w_m determines how many dead tuples lazy_scan_heap() can
keep track of before doing a lazy_vacuum_indexes() +
lazy_vacuum_heap() round. Smaller the m_w_m, more the number of index
scans, slower the progress?
Thanks,
Amit