Re: How best to do parallel query given tens of thousands of iteration of a loop of recursive queries?

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От Steve Midgley
Тема Re: How best to do parallel query given tens of thousands of iteration of a loop of recursive queries?
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Msg-id CAJexoS+mG=4AKfjAb0+i5DKhHB_8qSxZz3g5Ny+MZirGBj7Vdg@mail.gmail.com
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Ответ на How best to do parallel query given tens of thousands of iteration of a loop of recursive queries?  (Shaozhong SHI <shishaozhong@gmail.com>)
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On Sun, Apr 10, 2022, 6:50 AM Shaozhong SHI <shishaozhong@gmail.com> wrote:
There is a plpgsql script that have a loop to carry out the same recursive queries.

The estimation of iteration is in the order of tens of thousands.

What is the best way of making using parallel query strategy.

Any examples?

Can you provide some sample ddl, data and sql to illustrate your question? 

You mention in one place "iteration" and "parallel" but in another you mention recursion.. Recursion (by definition?) involves pushing state data forward into each successive iteration.. Therefore you can't run recursion in parallel. 

If you can provide examples maybe we can see which if parallelism is a possibility.. 

Steve 

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