Re: BUG #16593: pg_upgrade make corrupt UK indexes

Agreed!

Bruce Momjian <bruce(at)momjian(dot)us> ezt írta (időpont: 2020. aug. 27., Cs,
0:57):

> On Wed, Aug 26, 2020 at 09:49:00AM +0200, Magnus Hagander wrote:
> >
> >
> > On Wed, Aug 26, 2020 at 7:38 AM Nick Cleaton <nick(at)cleaton(dot)net> wrote:
> >
> > On Tue, 25 Aug 2020 at 23:55, PG Bug reporting form <
> noreply(at)postgresql(dot)org
> > > wrote:
> >
> > We upgrade from 9.6 Centos7 to 12.3 Centos 8
> >
> >
> > This from
> https://www.postgresql.org/docs/12/amcheck.html#id-1.11.7.11.9
> > might be relevent:
> >
> > > Comparisons of datums of a collatable type like text must be
> immutable
> > (just as all comparisons used for B-Tree index scans must be
> immutable),
> > which implies that operating system collation rules must never
> change.
> > Though rare, updates to operating system collation rules can cause
> these
> > issues. More commonly, an inconsistency in the collation order
> between a
> > master server and a standby server is implicated, possibly because
> the
> > major operating system version in use is inconsistent
> >
> >
> > And in particular also see
> https://wiki.postgresql.org/wiki/Locale_data_changes
> > , which shows that the step from Centos7 to Centos8 is one that causes
> this
> > problem. You need to reindex all text/varchar indexes when you make that
> > upgrade.
>
> And we should have a script ready for people to do this. :-)
>
> --
> Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
> EnterpriseDB https://enterprisedb.com
>
> The usefulness of a cup is in its emptiness, Bruce Lee
>
>