HV000ERRORTier 2 — Caution✅ HIGH confidence

FDW error

Category: Foreign Data Wrapper ErrorVersions: All Postgres versions (with FDW extension)

What this means

SQLSTATE HV000 is the generic foreign data wrapper (FDW) error code raised when an error occurs in a foreign data wrapper that does not map to a more specific HVxxx code. It indicates a problem communicating with or accessing a foreign data source.

Why it happens

1A generic error in a foreign data wrapper (postgres_fdw, file_fdw, oracle_fdw, etc.)
2Remote server connection failure in postgres_fdw
3Foreign data source returns an error not covered by a more specific code

How to reproduce

Query on a foreign table when the remote server is unreachable.

trigger — this will ERROR

SELECT * FROM foreign_orders; -- remote server is down

ERROR: could not connect to server "remote_server"

Fix 1: Check the foreign server connectivity and credentials

When HV000 is raised on a foreign table query.

fix

-- Test connectivity to the foreign server:
SELECT * FROM dblink('host=remote_host dbname=remotedb', 'SELECT 1') AS t(result INT);

Why this works

Verify the foreign server is reachable, the credentials in the user mapping are correct, and the foreign server definition matches the remote Postgres configuration.

Sources

📚 Official docs: https://www.postgresql.org/docs/current/errcodes-appendix.html

📚 Feature docs: https://www.postgresql.org/docs/current/postgres-fdw.html

🔧 Source ref: Class HV — Foreign Data Wrapper Error

Confidence assessment

✅ HIGH confidence

Standard SQLSTATE for FDW errors. Stable across versions.