SQLSTATE HV00K indicates the foreign data wrapper lost its handle to the remote reply.
fdw_reply_handle (PostgreSQL SQLSTATE HV00K) means the foreign data wrapper lost its handle to the remote server's reply. Refresh the foreign table or reconnect: close the old cursor, commit or rollback, and rerun the query after renewing the FDW connection.
fdw_reply_handle
PostgreSQL raises SQLSTATE HV00K when a Foreign Data Wrapper (FDW) session loses or receives an invalid reply handle from the remote server. The handle is an internal pointer that tracks the outstanding result set.
The error stops any query that tries to fetch or iterate over a foreign cursor whose reply handle is no longer valid.
Fixing it quickly restores cross-database queries and keeps data pipelines healthy.
The handle becomes invalid when the remote connection is closed, reset, or times out before PostgreSQL finishes reading the reply. Network glitches, proxy resets, and firewalls commonly trigger this state.
A badly written FDW extension can also drop or overwrite the handle between calls.
Long-running transactions holding idle cursors are another source of stale handles.
Restart the FDW session: commit or roll back the current transaction, then reconnect.
This forces PostgreSQL to ask the foreign server for a fresh cursor and reply handle.
If the problem persists, increase the keep-alive and statement timeout settings on both PostgreSQL and the remote server, or patch the FDW driver if a bug is known.
Long-running ETL job - Break the job into smaller batches so each foreign query finishes before the remote idle timeout.
Connection pool reset - Configure pgbouncer or AWS RDS Proxy to keep connections alive longer than the FDW query duration.
Always close foreign cursors promptly and avoid holding them across user think-time.
Monitor idle-in-transaction time.
Use Galaxy Collections to store optimized foreign queries; the Galaxy AI copilot can refactor queries to minimize network round-trips, reducing handle loss risk.
HV00L fdw_unable_to_create_execution - FDW fails to start a remote query. Check permissions and SQL syntax.
HV00M fdw_unable_to_create_reply - Remote server sent no reply. Inspect network paths and server logs.
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No. It only aborts the current statement. Committed data remains safe.
Yes. Closing the transaction or session is usually enough.
All versions that support FDW (9.1+) can raise HV00K.
Galaxy’s AI copilot optimizes foreign queries and flags idle cursors, lowering the chance of handle loss.
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