http://www.postgresql.org/docs/9.3/static/routine-vacuuming.html#VACUUM-FOR-MULTIXACT-WRAPAROUND Might also want to take a look at pg_stat_activity to see what queries maybe hanging up:http://www.postgresql.org/docs/9.3/static/monitoring-stats.html#PG-STAT-ACTIVITY-VIEW
pgsql-sql by date:
Соглашаюсь с условиями обработки персональных данных