Re: different plan with insert/select

And if there's a difference in predicates, could it be a side effect of a change in join order and could you try to find a leading() hint that modifies the join order.

Regards
Jonathan Lewis

On Wed, Jun 24, 2020 at 12:19 PM Noveljic Nenad <nenad.noveljic_at_vontobel.com> wrote:

> - The source of VW_LAT are outer joins. It is an ANSI query, but without
> any explicit lateral references.
>
>
>
> - Bypassed unnestings and/or lateral view decorrelations might explain
> less join permutations. I’ll examine the optimizer trace.
>
>
>
> - Select plan runs in 10s, insert/select is running for hours.
>
>
>
> - In a couple of hours I’ll be able to compare the result sets.
>
>
>
> - You mean this: Plan Regression with VW_DCL (Lateral View Decorrelation)
> in Explain Plan New Transformation in 12c Optimizer (Doc ID 2361393.1) ?
>
> The optimizer indeed comes up with the poor plan for the select with
> "_optimizer_ansi_rearchitecture" = false;
>
> I'd say, DCL is done for select, but apparently has some limitations with
> CTAS/INS. Rewriting the query to the Oracle syntax might be a workaround.
>
>
>
> Best regards,
>
>
>
> Nenad
>
>
>
> http://nenadnoveljic.com/blog/
>
>
>
>
>
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