You'll need to get a particular revision of MediaWiki that is PG 8.3 compatible: http://people.planetpostgresql.org/greg/index.php?/archives/123- MediaWiki-is-Postgres-8.3-compatible.html Once that's done, it works fine (at least for me).
pgsql-general by date:
Соглашаюсь с условиями обработки персональных данных