To temporarily disable all triggers in a PostgreSQL session, use this:

SET session_replication_role = replica;

That disables all triggers for the current database session only. Useful for bulk operations, but remember to be careful to keep your database consistent.

To re-enable:

SET session_replication_role = DEFAULT;

This query sums total disk space used by the table including indexes and toasted data for the 20 largest tables:

SELECT nspname || '.' || relname AS "relation",
    pg_size_pretty(pg_total_relation_size(C.oid)) AS "total_size"
  FROM pg_class C
  LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
  WHERE nspname NOT IN ('pg_catalog', 'information_schema')
    AND …