Vol. I · A Postgres Handbook

The Query & the Schema

A reading-room reference for writing PostgreSQL by hand — selects to window functions, with the schema in plain view.

AdvancedAdvanced PostgreSQL

Theory Deep Dive: Foreign Data Wrappers (FDW)

The query

SQL
-- Q: Explain the concept and best practices for Foreign Data Wrappers (FDW) in PostgreSQL.
-- A: Foreign Data Wrappers (FDW) is a critical part of the PostgreSQL ecosystem.
-- In PostgreSQL, unlike MySQL, this mechanism is tightly integrated with its process-per-connection model
-- and MVCC architecture to ensure strict data integrity and high performance under concurrent loads.
Tested against PostgreSQL 16

Note

“Understanding Foreign Data Wrappers (FDW) is essential for senior PostgreSQL DBA roles.