Wells Oliver schrieb am 09.02.2021 um 19:00:
> Hey guys, I just upgraded a DB from 12 to 13. In testing this seemed
> to go well, but it seems like most of my queries are not using the
> indexes after the upgrade, so everything is quite so.
>
> Is there a general need to REINDEX after upgrading to 13, or might
> there be another issue? The configuration parameters are the same as
> they were persisted via pg_upgradecluster.
If you want to profit from the new de-duplication in indexes, you will need to reindex.