PostgreSQL vs Redis
PostgreSQL and Redis are both evaluated in the CIOPages Enterprise Database Platforms Buyer's Guide. The guide groups PostgreSQL under Open-Source Default and Redis under In-Memory.
| Attribute | PostgreSQL (+ managed: RDS, Cloud SQL, Azure DB) | Redis / Valkey |
|---|---|---|
| Approach | Open-Source Default | In-Memory |
| Best for | Almost any new transactional application — the default you should have to argue your way out of | Caching and latency-critical key-value workloads alongside a primary database — choosing Redis or Valkey by license preference |
From the Enterprise Database Platforms Buyer's Guide, updated June 2026. 10 vendors evaluated.
PostgreSQL (+ managed: RDS, Cloud SQL, Azure DB)
Start here and make someone argue you off it: the category’s center of gravity and the most-used database among professional developers in the 2025 Stack Overflow survey, under a permissive license with no source-available drama, an unmatched extension ecosystem — PostGIS for geospatial, pgvector for AI embeddings, TimescaleDB for time-series — strong SQL standard coverage, and a first-party managed flavor on every cloud, with migrations from other engines overwhelmingly heading toward it. Vanilla Postgres scales writes on a single primary, so horizontal write scale means sharding with Citus or moving to a distributed-SQL engine. Self-managed Postgres demands real expertise in vacuum, bloat, connection limits, and major-version upgrades, first-party enterprise support comes from third parties like EDB, Crunchy, and Percona, and managed-service feature sets and version cadence vary by cloud.
PostgreSQL (+ managed: RDS, Cloud SQL, Azure DB) in the full guide
Redis / Valkey
The de facto in-memory data store for caching, sessions, rate-limiting, queues, and leaderboards, with microsecond-class latency and rich data structures — and the license question is now part of the buying decision. After community backlash to the 2024 relicensing, Redis 8 in 2025 added the OSI-approved AGPL and folded in JSON, search, time-series, and vector sets, while the Linux Foundation’s Valkey fork stays BSD-licensed and is backed by AWS, Google, and Oracle, with both available as managed services. It is primarily a complement to a system of record rather than a durable primary database for most use cases: persistence and clustering exist, but memory-first means cost scales with dataset size. The 2024–2025 license churn fragmented the ecosystem, so choose a lane deliberately — major Linux distributions now ship Valkey by default.
Also evaluated in this guide
Amazon Aurora & DynamoDB, CockroachDB, Couchbase (Capella), Google AlloyDB & Cloud Spanner, Microsoft SQL Server / Azure SQL, MongoDB (Atlas), MySQL (+ Aurora MySQL, HeatWave), Oracle Database
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