Re: pgsql: Allow vacuums to report oldestxmin

On Wed, Mar 29, 2017 at 3:31 PM, Masahiko Sawada <sawada.mshk@gmail.com> wrote:
> On Wed, Mar 29, 2017 at 1:32 AM, Fujii Masao <masao.fujii@gmail.com> wrote:
>> On Tue, Mar 28, 2017 at 1:06 AM, Masahiko Sawada <sawada.mshk@gmail.com> wrote:
>>> On Sun, Mar 26, 2017 at 2:26 AM, Masahiko Sawada <sawada.mshk@gmail.com> wrote:
>>>> On Sun, Mar 26, 2017 at 1:37 AM, Fujii Masao <masao.fujii@gmail.com> wrote:
>>>>> On Mon, Mar 6, 2017 at 9:37 PM, Masahiko Sawada <sawada.mshk@gmail.com> wrote:
>>>>>> On Fri, Mar 3, 2017 at 10:50 PM, Simon Riggs <simon@2ndquadrant.com> wrote:
>>>>>>> Allow vacuums to report oldestxmin
>>>>>>>
>>>>>>> Allow VACUUM and Autovacuum to report the oldestxmin value they
>>>>>>> used while cleaning tables, helping to make better sense out of
>>>>>>> the other statistics we report in various cases.
>>>>>>>
>>>>>>> Branch
>>>>>>> ------
>>>>>>> master
>>>>>>>
>>>>>>> Details
>>>>>>> -------
>>>>>>> http://git.postgresql.org/pg/commitdiff/9eb344faf54a849898d9be012ddfa8204cfeb57c
>>>>>>>
>>>>>>> Modified Files
>>>>>>> --------------
>>>>>>> src/backend/commands/vacuumlazy.c | 9 +++++----
>>>>>>> 1 file changed, 5 insertions(+), 4 deletions(-)
>>>>>>>
>>>>>>>
>>>>>>
>>>>>> Should we change the example in vacuum.sgml file as well? Attached patch.
>>>>>
>>>>> "tuples" in the above should be "row versions"?
>>>>> We should review not only this line but also all the lines in the example
>>>>> of VERBOSE output, I think.
>>>>
>>>> Right. These verbose log messages are out of date. I ran
>>>> VACUUM(VERBOSE, ANALYZE) with same scenario as current example as
>>>> possible. Attached patch updates verbose log messages.
>>>>
>>>>
>>>
>>> Surprisingly the changes "tuples" -> "row versions" in vacuumlazy.c is
>>> introduced by commit feb4f44d296b88b7f0723f4a4f3945a371276e0b in 2003.
>>
>> This is the evidence that no one cares about the details of VACUUM VERBOSE
>> output example. So I'm tempted to simplify the example (please see the
>> attached patch) instead of keeping updating the example.
>
> Yes. I agree.

Pushed. I back-patched to all supported versions according to
Alvaro's comment upthread.

Regards,

-- 
Fujii Masao