PostgreSQL 18 continues the tradition of the world's most advanced open-source database with significant performance, concurrency, and administration improvements.
Performance improvements
PostgreSQL 18 introduces enhanced parallel execution for analytical queries, supporting parallel aggregation, order by, and hash joins. The new planner uses multidimensional statistics for more accurate estimates, reducing estimation errors by up to 30%.
Logical replication now supports automatic conflict resolution, enabling multi-master architectures without manual intervention. Bidirectional synchronization simplifies cross-region data distribution.
Administration and observability
The EXPLAIN command has been enhanced with real-time metrics and automatic index recommendations. The new pg_stat_activity view includes the current query plan, allowing bottleneck diagnosis without external tools.
Native partitioning now supports more aggressive partition pruning and online partition merging, simplifying management of tables with billions of records.
PostgreSQL 18 also improves JSON support with more operators and functions, bridging the gap with document databases without losing relational advantages.
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