Tom Lane wrote:

> I don't really see why you think that this path is going to lead to
> better performance than where you were before.  Manipulation of the
> temp table is never going to be free, and IN (sub-select) is always
> inherently not fast, and NOT IN (sub-select) is always inherently
> awful.  Throwing a pile of simple queries at the problem is not
> necessarily the wrong way ... especially when you are doing it in
> plpgsql, because you've already eliminated the overhead of network
> round trips and repeated planning of the queries.
>                       regards, tom lane

The reason why I think this may be faster is because I would avoid
running an update on data that needs to be inserted which saves
searching though the table for a matching token.

Perhaps I should do the insert first, then drop those tokens from the
temp table, then do my updates in a loop.

I'll have to do some benchmarking...


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