Re: delta relations in AFTER triggers

2016-11-02 15:57 GMT+01:00 Kevin Grittner <kgrittn@gmail.com>:

> On Sun, Oct 30, 2016 at 10:35 AM, Kevin Grittner <kgrittn@gmail.com>
> wrote:
>
> > SPI support would also
> > allow us to consider using set logic for validating foreign keys,
> > instead of the one-row-at-a-time approach currently used.
>
> Just as a proof of concept for this I used the attached test case
> to create foreign keys using current techniques versus set-oriented
> queries with the transition-tsr code.  These probably can be
> improved, since this is a "first cut" off the top of my head.
>
> The delete of about one million rows from a "parent" table with no
> matching rows in the "child" table, and no index on referencing
> column in the child table, took 24:17.969 using current triggers
> and 00:03.262 using the set-based triggers.  Yes, that reduces
> current run time for that case by 99.78%
>

this is great number

Pavel


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