Zero-Downtime PostgreSQL Major-Version Upgrade at Scale

• Mohammad Abu Mattar
• DevOps
• Databases
• Cloud Computing
• Published: 25 Jul, 2026
• Updated: 25 Jul, 2026

A multi-terabyte PostgreSQL 12 database was reaching end of life, and the business ran around the clock, so the usual answer of "schedule a maintenance window" was off the table. We upgraded it to Pos