Why PostgreSQL's process-per-connection model requires a connection pooler, PgBouncer session vs transaction vs statement pooling modes and their tradeoffs, pgbouncer.ini configuration, monitoring with SHOW commands, and a comparison of PgBouncer, Pgpool-II, and Supavisor.
Pgbouncer
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PgBouncer and PostgreSQL Connection Pooling -
PostgreSQL Security Hardening: A Practical Guide Row-level security, pg_audit, pg_hba.conf hardening, TLS configuration, PgBouncer authentication, Vault database secrets engine, roles and least privilege — a complete guide to locking down PostgreSQL in production.