EC
HV00P
PostgreSQLERRORNotableForeign Data Wrapper ErrorHIGH confidence

fdw_no_schemas

Production Risk

Low — schema import fails; no data is affected.

What this means

A foreign data wrapper operation found no schemas available or accessible on the remote server, preventing schema discovery or import.

Why it happens
  1. 1IMPORT FOREIGN SCHEMA called but the remote server exposes no schemas matching the filter.
  2. 2The user mapping lacks privileges to list schemas on the remote server.
  3. 3The remote database has no user-defined schemas (only pg_catalog/information_schema).
How to reproduce
trigger — this will error
trigger — this will error
IMPORT FOREIGN SCHEMA nonexistent_schema
  FROM SERVER myserver INTO local_schema;

expected output

ERROR:  HV00P: fdw_no_schemas

Fix 1

Verify the schema exists on the remote server

Verify the schema exists on the remote server
-- On the remote server:
\dn
-- or:
SELECT schema_name FROM information_schema.schemata;

Why this works

Confirms the schema name and that it is visible to the connecting user.

Fix 2

Check user mapping privileges

Check user mapping privileges
GRANT USAGE ON SCHEMA remote_schema TO remote_user;

Why this works

Grants the remote user the right to access the target schema.

Sources
Official documentation ↗

PostgreSQL 17 — HV00P fdw_no_schemas

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