From: Abadie Lana <Lana.Abadie@iter.org>
To: Justin Pryzby <pryzby@telsasoft.com>
Cc: pgsql-performance@lists.postgresql.org <pgsql-performance@lists.postgresql.org>
Subject: RE: select query does not pick up the right index
Date: Thu, 3 Jan 2019 12:58:06 +0000
Message-ID: <92561fd0a0a846288cb0360ee0ae2505@iter.org> (raw)
In-Reply-To: <20190102164525.GU25379@telsasoft.com>
References: <c2d19232595246018b277ebcd59a0046@iter.org>
<20190102164525.GU25379@telsasoft.com>
Lana ABADIE
Database Engineer
CODAC Section
ITER Organization, Building 72/4108, SCOD, Control System Division
Route de Vinon-sur-Verdon - CS 90 046 - 13067 St Paul Lez Durance Cedex - France
Phone: +33 4 42 17 84 02
Get the latest ITER news on http://www.iter.org/whatsnew
-----Original Message-----
From: Justin Pryzby <pryzby@telsasoft.com>
Sent: 02 January 2019 17:45
To: Abadie Lana <Lana.Abadie@iter.org>
Cc: pgsql-performance@lists.postgresql.org
Subject: Re: select query does not pick up the right index
On Wed, Jan 02, 2019 at 04:28:41PM +0000, Abadie Lana wrote:
> css_archive_3_0_0=# explain analyze select t.name, c.smpl_time,c.nanosecs,c.float_val,c.num_ val,c.str_val,c.datatype,c.array_val from sample c, channel t where t.channel_id=c.channel_i d and t.name='BUIL-B36-VA-RT-RT1:CL0001-2-ABW' order by c.smpl_time desc limit 5;
> QUERY PLAN
>
> --------------------------------------------------------------------------------------------
> --------------------------------------------------------------------------------------------
> -------------
> Gather (cost=1004.71..125606.08 rows=5 width=150) (actual time=38737.443..1220277.244 rows
> =3 loops=1)
> Workers Planned: 1
> Workers Launched: 1
> Single Copy: true
Do you have force_parallel_mode set ?
http://rhaas.blogspot.com/2018/06/using-forceparallelmode-correctly.html
--
Justin Pryzby
System Administrator
Telsasoft
+1-952-707-8581
Hi Justin
Indeed force_parallel_mode was set to on. Even after disabling it, same issue...
cheers
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To: pgsql-performance@postgresql.org
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Subject: RE: select query does not pick up the right index
In-Reply-To: <92561fd0a0a846288cb0360ee0ae2505@iter.org>
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