Re: Choosing parallel_degree - Mailing list pgsql-hackers

From Robert Haas
Subject Re: Choosing parallel_degree
Date
Msg-id CA+TgmoZPJdHKE2R1YSU6HAZUWn7=T0_-OwjQ6FOSsTdfS0TASA@mail.gmail.com
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In response to Re: Choosing parallel_degree  (Simon Riggs <simon@2ndQuadrant.com>)
Responses Re: Choosing parallel_degree  (Simon Riggs <simon@2ndQuadrant.com>)
List pgsql-hackers
On Mon, Apr 11, 2016 at 5:45 PM, Simon Riggs <simon@2ndquadrant.com> wrote:
> On 8 April 2016 at 17:49, Robert Haas <robertmhaas@gmail.com> wrote:
>> With the patch, you can - if you wish - substitute
>> some other number for the one the planner comes up with.
>
> I saw you're using AccessExclusiveLock, the reason being it affects SELECTs.
>
> That is supposed to apply when things might change the answer from a SELECT,
> whereas this affects only the default for a plan.
>
> Can I change this to a lower setting? I would have done this before applying
> the patch, but you beat me to it.

I don't have a problem with reducing the lock level there, if we're
convinced that it's safe.

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company



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