On Tue, Apr 25, 2017 at 2:45 PM, Bruce Momjian <bruce@momjian.us> wrote:
> On Tue, Apr 25, 2017 at 10:37:48AM -0700, Andres Freund wrote:
>> On 2017-04-25 13:11:32 -0400, Bruce Momjian wrote:
>> > I don't think this warrants inclusion in the release notes for reasons
>> > already discussed. The vacuum truncation operation is a rare one and
>> > an implementation detail.
>>
>> I think that's backwards. The truncate operation is quite delicate
>> because it happens with AccessExclusiveLock held. This regularly does
>> cause issues in production. When users look for things they possibly
>> should update for, something like "performance improvents in final
>> vacuum phase" + oneliner is going to be a lot more interesting than,
>> say, "Add MONEY operators for multiplication and division with INT8
>> values".
>>
>> More and more users are going to be primarily interested in three
>> classes of new things in postgres: 1) performance 2) replication 3)
>> easier management. Arbitrarily excluding one of the major categories
>> from release notes isn't a useful policy, especially if we continue to
>> list new feature that'll effect no more than a handful of people.
>
> I disputed that my logic is arbitrary. However, given your
> explanation, I have added the item:
>
> Improve speed of <command>VACUUM</>'s removal of trailing empty
> heap pages (Alvaro Herrera)
That's enough for me, thanks.