🆕 PostgreSQL 18: Major Upgrades for Cloud-Native Workloads

1. Asynchronous I/O (AIO)

• Game-changing performance boost: up to 2–3× faster for read-heavy workloads.

• Supports Linux io_uring and cross-platform workers.

• New pg_aios view for real-time I/O monitoring.

2. Developer Experience

• Virtual Generated Columns: computed on-demand by default, reducing storage and improving write speed.

• UUIDv7 Support: timestamp-ordered UUIDs for better indexing and caching.

• Enhanced RETURNING Clause: access both old and new values in DML operations.

• Temporal Constraints: WITHOUT OVERLAPS clause prevents time conflicts.

3. Security Enhancements

• OAuth 2.0 authentication support.

• MD5 deprecated in favor of SCRAM-SHA-256.

• Fine-grained TLS 1.3 cipher control via ssl_tls13_ciphers.

4. Operational Improvements

• Faster upgrades with preserved planner stats and parallel pg_upgrade.

• Better EXPLAIN output: includes buffer, CPU, WAL, and I/O metrics.

• Improved logical replication diagnostics via pg_stat_subscription_stats.

5. Monitoring & Integrity

• Byte-level I/O stats in pg_stat_io.

• Vacuum/analyze timing in pg_stat_all_tables.

• Data checksums enabled by default for corruption detection.

6. Schema & Protocol Updates

• Add NOT NULL constraints without full table scans (NOT VALID).

• Wire protocol v3.2 introduced (first update since 2003).

7. Availability

• PostgreSQL 18 is in preview on Neon with io_method = 'sync' for stability.

• Docker image available for local testing.