SRE Guide: How to Make PostgreSQL Databases Truly Reliable in Production

A site reliability engineering (SRE) practitioner has shared hard-won lessons on database reliability after discovering that three weeks of silently failing backups went unnoticed until a data corruption incident forced a restore attempt. The core lesson is that backups are meaningless unless restores are regularly tested, leading the team to implement an automated weekly restore script that has caught four separate backup failures over the past year. The article also covers monitoring PostgreSQL replication lag, using PgBouncer connection pooling to reduce backend load from hundreds of connections down to around 25, and identifying slow queries via pg_stat_statements. Safe schema migration techniques are highlighted, such as using CREATE INDEX CONCURRENTLY to avoid table locks during large ALTER operations. A six-panel monitoring dashboard covering connections, query latency, replication lag, cache hit ratio, and disk growth is recommended as a baseline observability setup.