Re: SELECT statement returns in 10seconds, but INSERT/CREATE TABLE AS with same SELECT takes 7 minutes

From: Vladimir Ryabtsev <greatvovan(at)gmail(dot)com>
To: tgl(at)sss(dot)pgh(dot)pa(dot)us
Cc: ranade(at)nodalexchange(dot)com, pgsql-performance(at)postgresql(dot)org
Subject: Re: SELECT statement returns in 10seconds, but INSERT/CREATE TABLE AS with same SELECT takes 7 minutes
Date: 2018-09-27 20:39:32
Message-ID: CAMqTPq=5KVOSKaxry0PFA8wVQWN8WsdycM=FSy1CUPUuGbDv7w@mail.gmail.com
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> The reason for the plan shape difference is probably that the bare SELECT
> is allowed to use parallelism while INSERT/SELECT isn't.
In case parallelism is used, should it report in the plan as something like
"workers planned: N"?

Vlad

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