Fix: Postgres FATAL: too many connections
Introduce PgBouncer or RDS Proxy
Raising `max_connections` is usually the wrong fix — each connection costs memory. Pool connections (PgBouncer, RDS Proxy) instead.
Frequently Asked Questions
What causes Postgres FATAL: too many connections?
Raising `max_connections` is usually the wrong fix — each connection costs memory. Pool connections (PgBouncer, RDS Proxy) instead.
How to fix Postgres FATAL: too many connections?
Check active connections: `SELECT count(*) FROM pg_stat_activity`. Add PgBouncer or RDS Proxy in front before raising the DB limit.
Example fix from Kintify Fix
Input: FATAL: remaining connection slots are reserved
Output: Check active connections: `SELECT count(*) FROM pg_stat_activity`. Add PgBouncer or RDS Proxy in front before raising the DB limit.
Used by developers debugging real production systems