{"Entry":{"collection":"sqlstate","key":"HV001","name":"HV001","aliases":[],"metadata":{"aliases":[],"case_count":0,"class_code":"HV","condition_name":"fdw_out_of_memory","condition_names":["fdw_out_of_memory"],"content_hash":"3959d31285b198c5b22fb256e9282b76f997aa7ee130d9f01c2f173a41208c7a","depth":"reference","editorial_review":"reviewed","evidence_tier":"source_path_confirmed","imported_at":"2026-09-30T17:45:27.988396+08:00","introduced":null,"known_present_by":"9.1.0","macros":["ERRCODE_FDW_OUT_OF_MEMORY"],"name_zh":"外部数据包装器内存不足","present_in":["9.1","9.2","9.3","9.4","9.5","9.6","10","11","12","13","14","15","16","17","18","19"],"preview_in":["19"],"primary_macro":"ERRCODE_FDW_OUT_OF_MEMORY","removed":null,"runtime_verification":"not_run","severity_classes":["E"],"snippet_count":0,"source_rev":"english-manuals:661c3d329f17aa7387ad938cf878cfc4b592648e79cdf748ea7b624fa018c236","sqlstate":"HV001","status":"active","summary_zh":"包装器分配内存失败，如获取 libpq 默认选项时。"}},"Definition":{"Collection":"sqlstate","Key":"HV001","SourceDatabase":"center","Version":"18","SourceTable":"sqlstate","SourceKey":"HV001","SourceRevision":"english-manuals:661c3d329f17aa7387ad938cf878cfc4b592648e79cdf748ea7b624fa018c236","Facts":{"aliases":[],"class_name":"Foreign Data Wrapper Error (SQL/MED)","condition_name":"fdw_out_of_memory","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"56dacf78e618ff0fd8c533e05db597b80d7ebbad7f8e512a888217d0640aa328","slug":"18"},"lang":"en","sqlstate":"HV001"},"ManualEvidence":{"doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"56dacf78e618ff0fd8c533e05db597b80d7ebbad7f8e512a888217d0640aa328","slug":"18"}},"MeasuredEvidence":{}},"Text":{"Collection":"sqlstate","Key":"HV001","SourceDatabase":"center","Version":"","Locale":"en","Title":"HV001 — fdw_out_of_memory","Summary":"HV001 is the SQL/MED condition for an FDW-side out-of-memory failure. In PostgreSQL 18.6, the bundled postgresfdw and dblink implementations use it when PQconndefaults() returns no option array, and postgresfdw also uses it when its option copy cannot be allocated.","BodyHTML":"\u003ch1\u003eHV001 — fdw_out_of_memory\u003c/h1\u003e\n\u003ch2\u003eAt a glance {#at-a-glance}\u003c/h2\u003e\n\u003cp\u003e\u003ccode\u003eHV001\u003c/code\u003e is the SQL/MED condition for an FDW-side out-of-memory failure. In PostgreSQL 18.6, the bundled \u003ccode\u003epostgres_fdw\u003c/code\u003e and \u003ccode\u003edblink\u003c/code\u003e implementations use it when \u003ccode\u003ePQconndefaults()\u003c/code\u003e returns no option array, and \u003ccode\u003epostgres_fdw\u003c/code\u003e also uses it when its option copy cannot be allocated.\u003c/p\u003e\n\u003cp\u003eThe fixed source messages are \u003ccode\u003eout of memory\u003c/code\u003e, optionally with detail \u003ccode\u003eCould not get libpq\u0026#39;s default connection options.\u003c/code\u003e This is an \u003ccode\u003eERROR\u003c/code\u003e; whether the remote operation ran is phase-specific.\u003c/p\u003e\n\u003ch2\u003eMeaning and trigger paths {#meaning}\u003c/h2\u003e\n\u003cp\u003e\u003ccode\u003epostgres_fdw\u003c/code\u003e calls \u003ccode\u003ePQconndefaults()\u003c/code\u003e while building its option list; a null result is treated as an allocation failure and reported with \u003ccode\u003eHV001\u003c/code\u003e. A later \u003ccode\u003emalloc\u003c/code\u003e for the copied options has the same code but only the primary message. \u003ccode\u003edblink\u003c/code\u003e has two corresponding option-discovery paths. These are wrapper implementation details, not proof that every \u003ccode\u003eHV001\u003c/code\u003e means the backend allocator exhausted all memory.\u003c/p\u003e\n\u003ch2\u003eMessages and diagnostics {#messages}\u003c/h2\u003e\n\u003cp\u003eThe 18.6 source variants are:\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ccode\u003eERROR: out of memory\u003c/code\u003e, with detail \u003ccode\u003eCould not get libpq\u0026#39;s default connection options.\u003c/code\u003e in \u003ccode\u003econtrib/dblink/dblink.c:1972-1974\u003c/code\u003e, \u003ccode\u003e:2908-2910\u003c/code\u003e, and \u003ccode\u003econtrib/postgres_fdw/option.c:317-319\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eERROR: out of memory\u003c/code\u003e without detail in \u003ccode\u003econtrib/postgres_fdw/option.c:340-341\u003c/code\u003e.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp\u003eKeep the function phase and wrapper name. The message is not a remote server response.\u003c/p\u003e\n\u003ch2\u003eDiagnosis {#diagnosis}\u003c/h2\u003e\n\u003cp\u003eCapture SQLSTATE and all fields, then identify whether failure occurred while reading FDW/server options or while establishing a dblink/postgres_fdw connection. Inspect backend memory pressure, process limits, and the wrapper/library versions. If the detail names libpq defaults, first distinguish a \u003ccode\u003ePQconndefaults()\u003c/code\u003e allocation failure from a libpq installation or configuration problem; check the local library path/version only as supporting evidence before debugging the remote SQL.\u003c/p\u003e\n\u003ch2\u003eResponse {#response}\u003c/h2\u003e\n\u003cp\u003eReduce concurrent memory pressure and check the backend process/container limits, then retry the same option-discovery operation only after the allocation failure is understood. If the server actually reports \u003ccode\u003e53200\u003c/code\u003e, follow that SQLSTATE\u0026#39;s diagnostic; do not relabel a confirmed \u003ccode\u003eHV001\u003c/code\u003e merely because an allocation failed. For a write path, establish from the callback phase and remote logs whether any remote command was sent before retrying; \u003ccode\u003eHV001\u003c/code\u003e alone is not a whole-transaction retry signal.\u003c/p\u003e\n\u003ch2\u003eVersions {#versions}\u003c/h2\u003e\n\u003cp\u003eThe catalogue first observes \u003ccode\u003eHV001\u003c/code\u003e in 9.1.0 and retains it through 18.6 and 19 Beta 3. The 18.6 implementation paths and exact capitalization above are fixed to commit \u003ccode\u003e724edf9bde9d356724ad384a2e196edc3c9f80f7\u003c/code\u003e; older variants may differ.\u003c/p\u003e\n\u003ch2\u003eRelated {#related}\u003c/h2\u003e\n\u003cp\u003e\u003ca href=\"/wiki/sqlstate/HV000/\" rel=\"nofollow\"\u003e\u003ccode\u003eHV000\u003c/code\u003e\u003c/a\u003e is the generic FDW condition. \u003ca href=\"/wiki/sqlstate/HV002/\" rel=\"nofollow\"\u003e\u003ccode\u003eHV002\u003c/code\u003e\u003c/a\u003e is a missing wrapper parameter. \u003ca href=\"/wiki/sqlstate/53200/\" rel=\"nofollow\"\u003e\u003ccode\u003e53200\u003c/code\u003e\u003c/a\u003e is the generic backend out-of-memory condition and should not be substituted without evidence that the backend, rather than the FDW path, raised the error.\u003c/p\u003e\n\u003ch2\u003eSources {#sources}\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/errcodes.txt#L477\" rel=\"nofollow\"\u003e\u003ccode\u003eerrcodes.txt\u003c/code\u003e\u003c/a\u003e — definition, SHA-256 \u003ccode\u003e6e8de346643ba84aa3c9c6a73360acfc7b2dfb89162c06c08ce9bf5bcd5bbcba\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/contrib/postgres_fdw/option.c#L313-L341\" rel=\"nofollow\"\u003e\u003ccode\u003epostgres_fdw/option.c\u003c/code\u003e\u003c/a\u003e — option discovery and allocation paths.\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/contrib/dblink/dblink.c#L1968-L1974\" rel=\"nofollow\"\u003e\u003ccode\u003edblink.c\u003c/code\u003e\u003c/a\u003e — dblink option path.\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#sources\" rel=\"nofollow\"\u003eStructured evidence\u003c/a\u003e — exact message variants and source hashes.\u003c/li\u003e\n\u003c/ul\u003e\n","SourceRevision":"english-manuals:661c3d329f17aa7387ad938cf878cfc4b592648e79cdf748ea7b624fa018c236","ContentHash":"5240ab8b82d642b970e0dde5e0d2e05fba46ea7fdc8aec80d782e72d6bafd14c","Payload":{"body_md":"# HV001 — fdw_out_of_memory\n\n## At a glance {#at-a-glance}\n\n`HV001` is the SQL/MED condition for an FDW-side out-of-memory failure. In PostgreSQL 18.6, the bundled `postgres_fdw` and `dblink` implementations use it when `PQconndefaults()` returns no option array, and `postgres_fdw` also uses it when its option copy cannot be allocated.\n\nThe fixed source messages are `out of memory`, optionally with detail `Could not get libpq's default connection options.` This is an `ERROR`; whether the remote operation ran is phase-specific.\n\n\n## Meaning and trigger paths {#meaning}\n\n`postgres_fdw` calls `PQconndefaults()` while building its option list; a null result is treated as an allocation failure and reported with `HV001`. A later `malloc` for the copied options has the same code but only the primary message. `dblink` has two corresponding option-discovery paths. These are wrapper implementation details, not proof that every `HV001` means the backend allocator exhausted all memory.\n\n## Messages and diagnostics {#messages}\n\nThe 18.6 source variants are:\n\n- `ERROR: out of memory`, with detail `Could not get libpq's default connection options.` in `contrib/dblink/dblink.c:1972-1974`, `:2908-2910`, and `contrib/postgres_fdw/option.c:317-319`.\n- `ERROR: out of memory` without detail in `contrib/postgres_fdw/option.c:340-341`.\n\nKeep the function phase and wrapper name. The message is not a remote server response.\n\n## Diagnosis {#diagnosis}\n\nCapture SQLSTATE and all fields, then identify whether failure occurred while reading FDW/server options or while establishing a dblink/postgres_fdw connection. Inspect backend memory pressure, process limits, and the wrapper/library versions. If the detail names libpq defaults, first distinguish a `PQconndefaults()` allocation failure from a libpq installation or configuration problem; check the local library path/version only as supporting evidence before debugging the remote SQL.\n\n## Response {#response}\n\nReduce concurrent memory pressure and check the backend process/container limits, then retry the same option-discovery operation only after the allocation failure is understood. If the server actually reports `53200`, follow that SQLSTATE's diagnostic; do not relabel a confirmed `HV001` merely because an allocation failed. For a write path, establish from the callback phase and remote logs whether any remote command was sent before retrying; `HV001` alone is not a whole-transaction retry signal.\n\n## Versions {#versions}\n\nThe catalogue first observes `HV001` in 9.1.0 and retains it through 18.6 and 19 Beta 3. The 18.6 implementation paths and exact capitalization above are fixed to commit `724edf9bde9d356724ad384a2e196edc3c9f80f7`; older variants may differ.\n\n## Related {#related}\n\n[`HV000`](/wiki/sqlstate/HV000/) is the generic FDW condition. [`HV002`](/wiki/sqlstate/HV002/) is a missing wrapper parameter. [`53200`](/wiki/sqlstate/53200/) is the generic backend out-of-memory condition and should not be substituted without evidence that the backend, rather than the FDW path, raised the error.\n\n## Sources {#sources}\n\n- [`errcodes.txt`](https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/errcodes.txt#L477) — definition, SHA-256 `6e8de346643ba84aa3c9c6a73360acfc7b2dfb89162c06c08ce9bf5bcd5bbcba`.\n- [`postgres_fdw/option.c`](https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/contrib/postgres_fdw/option.c#L313-L341) — option discovery and allocation paths.\n- [`dblink.c`](https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/contrib/dblink/dblink.c#L1968-L1974) — dblink option path.\n- [Structured evidence](#sources) — exact message variants and source hashes.\n","description":"PostgreSQL SQLSTATE HV001 reports an FDW-side allocation failure. PostgreSQL's bundled dblink and postgres_fdw paths use it while obtaining libpq connection options.","is_stale":false,"name":"","sections":[{"anchor":"","heading":"","html":"\u0026lt;h1\u0026gt;HV001 — fdw_out_of_memory\u0026lt;/h1\u0026gt;"},{"anchor":"at-a-glance","heading":"At a glance","html":"\u003cp\u003e\u003ccode\u003eHV001\u003c/code\u003e is the SQL/MED condition for an FDW-side out-of-memory failure. In PostgreSQL 18.6, the bundled \u003ccode\u003epostgres_fdw\u003c/code\u003e and \u003ccode\u003edblink\u003c/code\u003e implementations use it when \u003ccode\u003ePQconndefaults()\u003c/code\u003e returns no option array, and \u003ccode\u003epostgres_fdw\u003c/code\u003e also uses it when its option copy cannot be allocated.\u003c/p\u003e\n\u003cp\u003eThe fixed source messages are \u003ccode\u003eout of memory\u003c/code\u003e, optionally with detail \u003ccode\u003eCould not get libpq's default connection options.\u003c/code\u003e This is an \u003ccode\u003eERROR\u003c/code\u003e; whether the remote operation ran is phase-specific.\u003c/p\u003e"},{"anchor":"meaning","heading":"Meaning and trigger paths","html":"\u003cp\u003e\u003ccode\u003epostgres_fdw\u003c/code\u003e calls \u003ccode\u003ePQconndefaults()\u003c/code\u003e while building its option list; a null result is treated as an allocation failure and reported with \u003ccode\u003eHV001\u003c/code\u003e. A later \u003ccode\u003emalloc\u003c/code\u003e for the copied options has the same code but only the primary message. \u003ccode\u003edblink\u003c/code\u003e has two corresponding option-discovery paths. These are wrapper implementation details, not proof that every \u003ccode\u003eHV001\u003c/code\u003e means the backend allocator exhausted all memory.\u003c/p\u003e"},{"anchor":"messages","heading":"Messages and diagnostics","html":"\u003cp\u003eThe 18.6 source variants are:\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ccode\u003eERROR: out of memory\u003c/code\u003e, with detail \u003ccode\u003eCould not get libpq's default connection options.\u003c/code\u003e in \u003ccode\u003econtrib/dblink/dblink.c:1972-1974\u003c/code\u003e, \u003ccode\u003e:2908-2910\u003c/code\u003e, and \u003ccode\u003econtrib/postgres_fdw/option.c:317-319\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eERROR: out of memory\u003c/code\u003e without detail in \u003ccode\u003econtrib/postgres_fdw/option.c:340-341\u003c/code\u003e.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp\u003eKeep the function phase and wrapper name. The message is not a remote server response.\u003c/p\u003e"},{"anchor":"diagnosis","heading":"Diagnosis","html":"\u003cp\u003eCapture SQLSTATE and all fields, then identify whether failure occurred while reading FDW/server options or while establishing a dblink/postgres_fdw connection. Inspect backend memory pressure, process limits, and the wrapper/library versions. If the detail names libpq defaults, first distinguish a \u003ccode\u003ePQconndefaults()\u003c/code\u003e allocation failure from a libpq installation or configuration problem; check the local library path/version only as supporting evidence before debugging the remote SQL.\u003c/p\u003e"},{"anchor":"response","heading":"Response","html":"\u003cp\u003eReduce concurrent memory pressure and check the backend process/container limits, then retry the same option-discovery operation only after the allocation failure is understood. If the server actually reports \u003ccode\u003e53200\u003c/code\u003e, follow that SQLSTATE's diagnostic; do not relabel a confirmed \u003ccode\u003eHV001\u003c/code\u003e merely because an allocation failed. For a write path, establish from the callback phase and remote logs whether any remote command was sent before retrying; \u003ccode\u003eHV001\u003c/code\u003e alone is not a whole-transaction retry signal.\u003c/p\u003e"},{"anchor":"versions","heading":"Versions","html":"\u003cp\u003eThe catalogue first observes \u003ccode\u003eHV001\u003c/code\u003e in 9.1.0 and retains it through 18.6 and 19 Beta 3. The 18.6 implementation paths and exact capitalization above are fixed to commit \u003ccode\u003e724edf9bde9d356724ad384a2e196edc3c9f80f7\u003c/code\u003e; older variants may differ.\u003c/p\u003e"},{"anchor":"related","heading":"Related","html":"\u003cp\u003e\u003ca href=\"/wiki/sqlstate/HV000/\"\u003e\u003ccode\u003eHV000\u003c/code\u003e\u003c/a\u003e is the generic FDW condition. \u003ca href=\"/wiki/sqlstate/HV002/\"\u003e\u003ccode\u003eHV002\u003c/code\u003e\u003c/a\u003e is a missing wrapper parameter. \u003ca href=\"/wiki/sqlstate/53200/\"\u003e\u003ccode\u003e53200\u003c/code\u003e\u003c/a\u003e is the generic backend out-of-memory condition and should not be substituted without evidence that the backend, rather than the FDW path, raised the error.\u003c/p\u003e"},{"anchor":"sources","heading":"Sources","html":"\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/errcodes.txt#L477\"\u003e\u003ccode\u003eerrcodes.txt\u003c/code\u003e\u003c/a\u003e — definition, SHA-256 \u003ccode\u003e6e8de346643ba84aa3c9c6a73360acfc7b2dfb89162c06c08ce9bf5bcd5bbcba\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/contrib/postgres_fdw/option.c#L313-L341\"\u003e\u003ccode\u003epostgres_fdw/option.c\u003c/code\u003e\u003c/a\u003e — option discovery and allocation paths.\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/contrib/dblink/dblink.c#L1968-L1974\"\u003e\u003ccode\u003edblink.c\u003c/code\u003e\u003c/a\u003e — dblink option path.\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#sources\"\u003eStructured evidence\u003c/a\u003e — exact message variants and source hashes.\u003c/li\u003e\n\u003c/ul\u003e"}],"summary":"HV001 is the SQL/MED condition for an FDW-side out-of-memory failure. In PostgreSQL 18.6, the bundled postgresfdw and dblink implementations use it when PQconndefaults() returns no option array, and postgresfdw also uses it when its option copy cannot be allocated.","title":"HV001 — fdw_out_of_memory","translation_source_rev":"a6d30deafbab45769af24b00487ac11ea3ccb312e5f9d74ce33caa02063cb112"}},"RequestedLocale":"en","Fallback":false,"Versions":["10","11","12","13","14","15","16","17","18","19","20","9.1","9.2","9.3","9.4","9.5","9.6"],"Locales":["en","zh-Hans"],"Signatures":null,"Spellings":null,"SQLState":{"aliases":[],"catalogue_notes":{"earliest_observed":"9.1.0","formal_scope":"9.0.0..18.6","latest_observed":"18.6","matrix_scope":["9.0.23","9.1.24","9.2.24","9.3.25","9.4.26","9.5.25","9.6.24","10.23","11.22","12.22","13.23","14.24","15.19","16.15","17.11","18.6"],"pre9_scope":{"formal_tag_count":191,"maximum_release":"8.4.22","minimum_release":"7.0.0","source_definition_count":153,"source_doc_count":153,"source_file_count":306,"source_scope":"7.4..8.4 definition files; 7.0..7.3 candidate-path source gap probes","source_tag_count":153},"pre9_status":"not_observed","preview_scope":["19beta3"]},"class":"HV","class_name":"Foreign Data Wrapper Error (SQL/MED)","condition_name":"fdw_out_of_memory","condition_names":["fdw_out_of_memory"],"definition_changes":[],"english_manuals":{"10":{"aliases":[],"class_name":"Foreign Data Wrapper Error (SQL/MED)","condition_name":"fdw_out_of_memory","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"9607b57e9f639b61785677ba4d226f5889fe1d19c8bf55a3337691899a9073cd","slug":"10"},"lang":"en","sqlstate":"HV001"},"11":{"aliases":[],"class_name":"Foreign Data Wrapper Error (SQL/MED)","condition_name":"fdw_out_of_memory","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"3a024e38263ad77de228eed7930b842b42dc1d5cab9ca3727be8eed872ec9539","slug":"11"},"lang":"en","sqlstate":"HV001"},"12":{"aliases":[],"class_name":"Foreign Data Wrapper Error 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