"Heikki Linnakangas" <heikki@enterprisedb.com> writes:
> Tom Lane wrote:
>>> Another real problem with doing pruning only in UPDATE path is that
>>> we may end up with long HOT chains if the page does not receive a
>>> UPDATE, after many consecutive HOT updates.
>>
>> How is that, if the same number of prune attempts would occur?
> It wouldn't. To avoid the long HOT chains, we want to prune more often
> than what's needed to just make room for updates.
I don't follow. HOT chains can only get longer by updates.
regards, tom lane