Blog Best Database for RAG in 2026: SQL Server vs PostgreSQL vs MongoDB vs Redis vs DuckDB
A practical 2026 RAG database decision matrix comparing SQL Server, PostgreSQL with pgvector, MongoDB, Redis, and DuckDB.
PostgreSQL
Blog Blog PostgreSQL 18 B-tree Skip Scan: When Multicolumn Indexes Can Skip the Leftmost Column
Learn how PostgreSQL 18 skip scan uses multicolumn B-tree indexes when a query omits a leading equality predicate, and when it is profitable.
Blog PostgreSQL 18 Asynchronous I/O: Configuration, Monitoring, and Tuning
Configure and measure PostgreSQL 18 asynchronous I/O with io_method, io_workers, effective_io_concurrency, pg_aios, and pg_stat_io.