query federation
Query independently managed data sources through a shared interface.
Use this when A report joins local records with data owned by another database.
without the term
“Query this remote database alongside local data without copying everything first. Check network work and consistency.”
with the term · How do you ask a model for query federation?
Evaluate query federation for this report. Inspect pushdown, transferred rows, permissions, and cross-source consistency.
What is query federation?
Query federation exposes data across separate sources without first copying everything into one store. Foreign tables are one implementation; remote execution, credentials, and transaction boundaries remain relevant.
Why does query federation matter when vibe coding?
An agent can write a convenient cross-source join that pulls millions of rows over the network.
How do you do query federation?
Inspect pushdown and transferred rows. Restrict credentials and define remote failure handling. Check whether the required cross-source consistency is supported.
What goes wrong with query federation?
One SQL statement across sources does not automatically provide a single global snapshot or atomic distributed writes.
Sources for this entry
- PostgreSQL: postgres_fdw
Foreign tables access remote PostgreSQL data; query pushdown, credentials, and remote transaction behavior matter.
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