On Fri, Feb 22, 2019 at 3:39 AM Tsunakawa, Takayuki
<tsunakawa.takay@jp.fujitsu.com> wrote:
>
> No, changing the parameter acquires ShareUpdaeExclusive lock. I just imitated the description for n_distinct in the
samecomment block. The meaning is that the setting cannot be changed during VACUUM, so in-flight VACUUM is not
affected.
Ah I see, thanks! I find this a little bit confusing but if that's
already documented like this for other parameters then I guess that's
ok.
One last thing, I think we should at least add one regression test for
this setting. The one you provided previously seems perfectly suited.