Azure HorizonDB vs PostgreSQL pgvector vs AI Search for RAG
Azure HorizonDB reached public preview at Build 2026: a PostgreSQL-compatible, scale-out engine with vector search built in, up to 128 TB of storage and Sweden Central among the five launch regions. For RAG embeddings on Azure the choice now runs three ways, decided by where the source data lives, how much retrieval quality matters and how close you are to Flexible Server's vertical-scaling ceiling.
Azure HorizonDB
PostgreSQL
pgvector
Azure AI Search
RAG
Vector Search
Microsoft Build 2026
Sweden Central
Data Residency
Av Falak Mahmood