Azure HorizonDB is a managed database service announced at the Microsoft Ignite conference, designed for enterprise workloads and compatible with Postgres. It supports up to 3072 vCores and accommodates databases up to 128TB with sub-millisecond multi-zone commit latencies. The service features AI Model Management for enhanced vector search speeds, utilizing advanced DiskANN filtering. HorizonDB's architecture focuses on upstream compatibility and disaggregated storage to improve performance, reducing commit latencies and accelerating failovers. It complements existing managed PostgreSQL solutions from Microsoft and is optimized for AI workloads. HorizonDB is currently in early preview in select regions.