Hi, On Wed, Jan 26, 2022 at 11:07 PM Matthias Apitz <guru@xxxxxxxxxxx> wrote: > > We changed two relevant Indexes to > > CREATE INDEX d01ort ON d01buch(d01ort bpchar_pattern_ops ); > CREATE INDEX d01ort2 ON d01buch(d01ort2 bpchar_pattern_ops ); When you said changed, did you drop the previous ones? As Tom mentioned, those indexes are specialized and are only useful for LIKE 'something%' queries. It's quite likely that your existing indexes were useful for other queries, which may not be as fast without those indexes. You can check in pg_stat_user_indexes if your indexes seems to be used before actually dropping them for instance: https://www.postgresql.org/docs/current/monitoring-stats.html#MONITORING-PG-STAT-ALL-INDEXES-VIEW
