HV001
PostgreSQLERRORNotableForeign Data Wrapper ErrorHIGH confidence
FDW out of memory
What this means
SQLSTATE HV001 is raised when a foreign data wrapper cannot allocate sufficient memory to perform its operation.
Why it happens
- 1The FDW process exhausts available memory while processing a large foreign table query
How to reproduce
FDW memory exhaustion on a large query.
expected output
ERROR: foreign-data wrapper memory allocation failed
Fix 1
Reduce the result set from the foreign table query
WHEN When HV001 appears on foreign table queries.
Reduce the result set from the foreign table query
SELECT * FROM foreign_table WHERE date > CURRENT_DATE - 30 LIMIT 1000;
Why this works
Adding WHERE conditions and LIMIT reduces the amount of data the FDW must buffer in memory.
Fix 2
Increase work_mem for the session
WHEN When the operation genuinely requires more memory.
Increase work_mem for the session
SET work_mem = '256MB';
Why this works
Increasing work_mem allows the FDW to use more memory for sorting and buffering foreign data.
Sources
Official documentation ↗
Class HV — Foreign Data Wrapper Error
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