On Wed, Feb 1, 2017 at 4:38 AM, Merlin Moncure <mmonc...@gmail.com> wrote:

> I was just troubleshooting a strange performance issue with pg_trgm
> (greatest extension over) that ran great in testing but poor in
> production following a 9.6 in place upgrade from 9.2. By poor I mean
> 7x slower.  Problem was resolved by ALTER EXTENSION UPDATE followed by
> a REINDEX on the impacted table.  Hope this helps somebody at some
> point :-).
>

It was probably the implementation of the triconsistent function for
pg_trgm (or I would like to think so, anyway).

But if so, the REINDEX should not have been necessary, just the ALTER
EXTENSION UPDATE should do the trick. Rebuiding a large gin index can be
pretty slow.

Cheers,

Jeff

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