Louis-David Mitterrand <vindex@apartia.org> writes:
> While trying to optimise a query I found that running VACUUM ANALYSE
> changed all the Index Scans to Seq Scans and that the only way to revert
> to Index Scans was the add "enable_seqscan = 0" in postgresql.conf.
EXPLAIN ANALYZE output would be more interesting than just EXPLAIN.
Also, what does the pg_stats view show for these tables?
regards, tom lane