PostgreSQL cannot build the execution state for a foreign table query because the foreign data wrapper, server, or user mapping is misconfigured or missing.
fdw_unable_to_create_execution appears when PostgreSQL cannot initialise an execution state for a foreign table. Check that the postgres_fdw extension is installed, the FOREIGN SERVER and USER MAPPING exist, and the role querying the table has USAGE on the server. Re-create or grant what is missing to resolve the error.
PostgreSQL fdw_unable_to_create_execution Error HV00L
PostgreSQL raises fdw_unable_to_create_execution (SQLSTATE HV00L) when it fails to build an execution state for a foreign table scan or modification.
The failure stops the query immediately because PostgreSQL cannot delegate work to the foreign server without the execution context.
PostgreSQL needs a functioning foreign data wrapper (FDW), a foreign server object, and a user mapping to bind the current session to the remote data source.
Missing or invalid objects cause the execution state build to fail.
Incorrect connection strings, dropped extensions, or revoked privileges also break the FDW handshake and trigger fdw_unable_to_create_execution.
Verify that the postgres_fdw extension exists in the current database. Re-create it with CREATE EXTENSION IF NOT EXISTS postgres_fdw.
Confirm the FOREIGN SERVER definition, correct options, and reachable host.
Recreate the server if options changed.
Create or refresh USER MAPPING for the calling role and make sure the role has USAGE ON FOREIGN SERVER.
After restoring a dump, foreign servers often come without user mappings. Re-create mappings to fix the error.
When a role gets membership revoked from a group that owned the user mapping, queries start failing.
Grant USAGE again or create a dedicated mapping.
Version-control all CREATE/ALTER statements for FDW objects and replay them during migrations.
Monitor pg_foreign_server and pg_user_mapping for unexpected drops. Alert immediately when counts change.
Errors HV00P (fdw_inconsistent_descriptor) and 42704 (undefined_object) frequently surface when the underlying FDW objects are missing. Fixing the foreign server and user mappings resolves them as well.
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The extension was never created in the database or was dropped during a migration, leaving dependent foreign tables unusable.
A DROP or ALTER operation removed required options such as host or dbname, blocking the FDW from connecting.
The session user lacks a mapping to the foreign server, so PostgreSQL cannot supply credentials to the remote source.
The role running the query lacks USAGE ON FOREIGN SERVER or lacks CONNECT on the remote database.
PostgreSQL cannot reach the foreign host during execution state creation, causing the FDW to abort.
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No. The error only affects query execution through the FDW. Your source and foreign data remain intact.
A restart rarely helps because the problem is schema or privilege related. Fix the FDW objects instead.
Galaxys SQL editor shows inline error codes and lets you share the failing query. Team members can review FDW objects and push a fix without context switching.
Yes. ALTER USER MAPPING allows updating passwords instantly without dropping the mapping or the foreign server.
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