Re: BUG #17361: Unique index constraint inconsistence - Mailing list pgsql-bugs

PG Bug reporting form <noreply@postgresql.org> writes:
> Indexes:
>     "parts_stock_stat_pkey" PRIMARY KEY, btree (id)
>     "parts_stock_stat_lower_stock_type_id_idx" UNIQUE, btree (lower(name),
> stock_type_id)

> Following reindex command failed:
> db=# reindex table parts_stock_stat;
> ERROR:  could not create unique index
> "parts_stock_stat_lower_stock_type_id_idx"
> DETAIL:  Key (lower(name), stock_type_id)=(ha_hr/50, 4) is duplicated.

How long have you had this database?  If it's older than your last
OS upgrade, it's possible that the index has become corrupt as a
result of OS-level collation changes.  See

https://wiki.postgresql.org/wiki/Locale_data_changes

            regards, tom lane