PostgreSQL: FATAL: remaining connection slots are reserved for non-replication superuser connections
FATAL: remaining connection slots are reserved for non-replication superuser connections at Connection.parseE (/node_modules/pg/lib/connection.js:614:13)
Immediate Remediation
typescript
Use a connection pooler like PgBouncer or Neon connection pooler (-pooler endpoint), or increase max_connections in postgresql.conf.
Root Cause Analysis
Encountered in PostgreSQL when standard runtime constraints or configuration contracts are breached.
Verification & Guardrails
- Verified in production environments by TraceResolve SRE.
- Requires clean rebuild or service reload to take full effect.
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