PostgreSQL
The world's most advanced open-source relational database — now with async I/O, B-tree skip scan, and native UUIDv7.
Overview
PostgreSQL is the most feature-rich open-source RDBMS, known for ACID compliance, extensibility, and advanced features (JSONB, full-text search, PostGIS, foreign data wrappers). PostgreSQL 18 (current, Feb 2026) introduces the landmark async I/O subsystem delivering 2–3× read performance improvements.
Key Facts
| Attribute |
Detail |
| Website |
postgresql.org |
| Latest Version |
v18.3 (February 26, 2026) |
| Language |
C |
| License |
PostgreSQL License (MIT-like, very permissive) |
| Governance |
PostgreSQL Global Development Group |
Evaluation
| Pros |
Cons |
| Most feature-rich RDBMS |
Single-node scale (vertical) |
| AIO: 2–3× read improvement (v18) |
Write-heavy workloads need tuning |
| Native UUIDv7 (v18) |
Replication historically lag-based |
| JSONB — document DB inside relational |
Vacuum overhead |
| Extensions (PostGIS, pgvector, TimescaleDB) |
Logical replication still maturing |
| PostgreSQL License (permissive) |
|
| OAuth 2.0 auth (v18) |
|
v18 Highlights
| Feature |
Detail |
| Async I/O |
io_method: sync, worker, or io_uring. 2–3× sequential/bitmap scan speedup |
| B-tree Skip Scan |
Use multi-column indexes even without leftmost column constraint |
| UUIDv7 |
Native uuidv7() — time-ordered, no index bloat |
| Virtual generated columns |
Computed at query time, save storage |
| Data checksums default |
Enabled by default for new clusters |
| pg_upgrade stats retain |
No post-upgrade performance cliff |
| OAuth 2.0 |
Native OAuth authentication |
| Logical replication |
Parallel streaming, conflict detection |
Sources