/* Total size of all the indexes on each table, descending by size */
SELECT c.relname AS table,
pg_size_pretty(pg_indexes_size(c.oid)) AS index_size
FROM pg_class c LEFT JOIN pg_namespace n ON (n.oid = c.relnamespace) WHERE n.nspname NOT IN ('pg_catalog', 'information_schema') AND n.nspname !~ '^pg_toast' AND c.relkind IN ('r', 'm') ORDER BY pg_indexes_size(c.oid) DESC;