Re: ANALYZE command progress checker

From: Jim Nasby <jim(dot)nasby(at)openscg(dot)com>
To: Andres Freund <andres(at)anarazel(dot)de>
Cc: Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, David Steele <david(at)pgmasters(dot)net>, vinayak <Pokale_Vinayak_q3(at)lab(dot)ntt(dot)co(dot)jp>, David Fetter <david(at)fetter(dot)org>, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: ANALYZE command progress checker
Date: 2017-03-10 19:57:00
Message-ID: 968b4eda-2417-8b7b-d468-71643cf088b6@openscg.com
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On 3/10/17 1:06 PM, Andres Freund wrote:
> Hi,
>
> On 2017-03-10 02:11:18 -0600, Jim Nasby wrote:
>> Perhaps instead of adding more clutter to \dvS we could just have a SRF for
>> now.
>
> I don't see that as clutter, it's useful information, and keeping it
> discoverable is good, not bad.

If we keep adding status reporting commands at some point it's going to
get unwieldy. Though, if they were in their own schema...

>> At over 2800 rows currently, you're not going to notice one more
>> addition to \dfS.
>
> I think it's hard to design a good SRF for this. Because the fields for
> different types of progress are different / empty, you can't just
> trivially return them as rows. You'd have to do some EAV like
> 'command, field_name1, field_value1, ...' type of thing - not
> particularly pretty / easy to use.

Oh, I wasn't suggesting a single SRF for everything. Hopefully users
will eventually figure out a good formula to drive a "progress bar" for
each type of monitor, which is what you really want anyway (at least 99%
of the time). If we got there we could have a single view that gave the
% complete for every command that was providing feedback. If someone
wanted details they could hit the individual SRF.
--
Jim Nasby, Chief Data Architect, OpenSCG
http://OpenSCG.com

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