On Fri, Feb 22, 2019 at 3:39 AM Tsunakawa, Takayuki <tsunakawa.ta...@jp.fujitsu.com> wrote: > > No, changing the parameter acquires ShareUpdaeExclusive lock. I just > imitated the description for n_distinct in the same comment 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.
