> 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] [1] https://www.postgresql.org/message-id/CAJcOf-ejV8iU%2BYpuV4qbYEY-2vCG1QF2g3Gxn%3DZ%2BPyUH_5f84A%40mail.gmail.com Best regards, houzj
