Bruce Momjian <bruce@momjian.us> writes:
> The idea that thousands of Postgres installations are slower just so we
> can occasionally debug xmin/xmax issues seems way off balance to me.
There's no evidence whatsoever that the scope of the problem is that large.
> If people want debugging, let them modify the freeze age settings; the
> defaults should not favor debugging when there is a measurable cost
> involved. How many times in the past five years have we even needed
> such debugging information, and also are cases where we could not have
> told the user to change freeze settings to get us that info?
You're missing the point here: this is something we need when trying
to make sense of cases that are hard or impossible to reproduce.
Retroactively changing the freeze policy isn't possible.
regards, tom lane