SELECT
  n.nspname || '.' || c.relname AS name,
  pg_size_pretty(sum(c.relpages::bigint*8192)::bigint) AS size
FROM pg_class c
LEFT JOIN pg_namespace n ON (n.oid = c.relnamespace)
WHERE NOT n.nspname LIKE ANY($1)
AND c.relkind = 'i'
GROUP BY n.nspname, c.relname
ORDER BY sum(c.relpages) DESC