From: | "Hou, Zhijie" <houzj(dot)fnst(at)cn(dot)fujitsu(dot)com> |
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To: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
Cc: | PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Greg Nancarrow <gregn4422(at)gmail(dot)com>, vignesh C <vignesh21(at)gmail(dot)com>, Amit Langote <amitlangote09(at)gmail(dot)com>, David Rowley <dgrowleyml(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "Tsunakawa, Takayuki" <tsunakawa(dot)takay(at)fujitsu(dot)com> |
Subject: | RE: Determine parallel-safety of partition relations for Inserts |
Date: | 2021-01-29 06:49:05 |
Message-ID: | 151ee94c4ffa42d897f2f448e1b7170e@G08CNEXMBPEKD05.g08.fujitsu.local |
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Lists: | pgsql-hackers |
> Hi,
>
> Attatching v1 patches, introducing options which let user manually control
> whether to use parallel dml.
>
> About the patch:
> 1. add a new guc option: enable_parallel_dml (boolean) 2. add a new
> tableoption: parallel_dml (boolean)
>
> The default of both is off(false).
>
> User can set enable_parallel_dml in postgresql.conf or seesion to enable
> parallel dml.
> If user want to choose some specific to use parallel insert, they can set
> table.parallel_dml to on.
>
> Some attention:
> (1)
> Currently if guc option enable_parallel_dml is set to on but table's
> parallel_dml is off, planner still do not consider parallel for dml.
>
> In this way, If user want to use parallel dml , they have to set
> enable_parallel_dml=on and set parallel_dml = on.
> If someone dislike this, I think we can also let tableoption. parallel_dml's
> default value to on ,with this user only need to set enable_parallel_dml=on
>
> (2)
> For the parallel_dml.
> If target table is partitioned, and it's parallel_dml is set to on, planner
> will ignore The option value of it's child.
> This is beacause we can not divide dml plan to separate table, so we just
> check the target table itself.
>
>
> Thoughts and comments are welcome.
The patch is based on v13 patch(parallel insert select) in [1]
Best regards,
houzj
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