Re: pgbench - allow to create partitioned tables

From: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>
To: Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>
Cc: Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr>, Asif Rehman <asifr(dot)rehman(at)gmail(dot)com>, PostgreSQL Developers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: pgbench - allow to create partitioned tables
Date: 2019-09-27 12:33:41
Message-ID: 20190927123341.GA16387@alvherre.pgsql
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On 2019-Sep-27, Amit Kapila wrote:

> Thanks, Alvaro, both seem like good suggestions to me. However, there
> are a few more things where your feedback can help:
> a. With new options, we will partition pgbench_accounts and the
> reason is that because that is the largest table. Do we need to be
> explicit about the reason in docs?

Hmm, I would document what is it that we do, and stop there without
explaining why. Unless you have concrete reasons to want the reason
documented?

> b. I am not comfortable with test modification in
> 001_pgbench_with_server.pl. Basically, it doesn't seem like we should
> modify the existing test to use non-default tablespaces as part of
> this patch. It might be a good idea in general, but I am not sure
> doing as part of this patch is a good idea as there is no big value
> addition with that modification as far as this patch is concerned.
> OTOH, as such there is no harm in testing with non-default
> tablespaces.

Yeah, this change certainly is out of place in this patch.

> The other thing is that the query used in patch to fetch partition
> information seems correct to me, but maybe there is a better way to
> get that information.

I hadn't looked at that, but yeah it seems that it should be using
pg_partition_tree().

--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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