{"Entry":{"collection":"sqlstate","key":"08006","name":"08006","aliases":[],"metadata":{"aliases":[],"case_count":1,"class_code":"08","condition_name":"connection_failure","condition_names":["connection_failure"],"content_hash":"e92b6ce47947efa09ee1f8484084cb2dc0562c33ea29bebcf6b3815486ca0036","depth":"full","editorial_review":"reviewed","evidence_tier":"source_path_confirmed","imported_at":"2026-09-30T17:45:26.705425+08:00","introduced":null,"known_present_by":"7.4","macros":["ERRCODE_CONNECTION_FAILURE"],"name_zh":"连接失败","present_in":["9.0","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_CONNECTION_FAILURE","removed":null,"runtime_verification":"not_run","severity_classes":["E"],"snippet_count":0,"source_rev":"english-manuals:27579a490920a8273428e87cff8d866374221184a614a8ca900493f2805c08e1","sqlstate":"08006","status":"active","summary_zh":"与服务器的连接在会话中途失败。"}},"Definition":{"Collection":"sqlstate","Key":"08006","SourceDatabase":"center","Version":"18","SourceTable":"sqlstate","SourceKey":"08006","SourceRevision":"english-manuals:27579a490920a8273428e87cff8d866374221184a614a8ca900493f2805c08e1","Facts":{"aliases":[],"class_name":"Connection Exception","condition_name":"connection_failure","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"56dacf78e618ff0fd8c533e05db597b80d7ebbad7f8e512a888217d0640aa328","slug":"18"},"lang":"en","sqlstate":"08006"},"ManualEvidence":{"doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"56dacf78e618ff0fd8c533e05db597b80d7ebbad7f8e512a888217d0640aa328","slug":"18"}},"MeasuredEvidence":{}},"Text":{"Collection":"sqlstate","Key":"08006","SourceDatabase":"center","Version":"","Locale":"zh-Hans","Title":"08006 — 连接失败（connection_failure）","Summary":"与服务器的连接在会话中途失败。","BodyHTML":"\u003ch1\u003e08006 — 连接失败\u003c/h1\u003e\n\u003ch2\u003e速览 {#at-a-glance}\u003c/h2\u003e\n\u003cp\u003eSQLSTATE \u003ccode\u003e08006\u003c/code\u003e 是 Class \u003ccode\u003e08\u003c/code\u003e 中的 \u003cstrong\u003econnection_failure\u003c/strong\u003e。\u003ccode\u003e08006\u003c/code\u003e 表示已有连接发生故障。固定路径包括 \u003ccode\u003epostgres_fdw\u003c/code\u003e 的取消/连接丢失处理以及 COPY 失败处理；它们没有一个适用于所有路径的主报文或严重级别，本批也有意不做普通 socket 的伪案例。\u003c/p\u003e\n\u003ch2\u003e含义 {#meaning}\u003c/h2\u003e\n\u003cp\u003e固定源码路径说明了为什么本类没有统一报文。在 \u003ccode\u003epostgres_fdw\u003c/code\u003e 中，取消请求失败时，在处理已有外部连接的过程中发出 \u003ccode\u003eWARNING\u003c/code\u003e；这是取消路径的诊断，本身不证明客户端会话已经终止。在 COPY 路径中，带有未完成事务的客户端 EOF 以 \u003ccode\u003eERROR\u003c/code\u003e 报告，而较旧的 COPY-to-stdout 路径在输出连接丢失时以 \u003ccode\u003eFATAL\u003c/code\u003e 报告。严重级别和发生阶段都是含义的一部分，不能把它们合并成“socket 断了”。\u003c/p\u003e\n\u003cp\u003e\u003ccode\u003eERROR\u003c/code\u003e 分支若发生在显式事务中，仍连接着的会话可能进入 \u003ccode\u003eINERROR\u003c/code\u003e，调用者应先 \u003ccode\u003eROLLBACK\u003c/code\u003e 或回到合适的保存点再执行无关 SQL。\u003ccode\u003eFATAL\u003c/code\u003e 分支会结束后端连接，不存在可以发送 \u003ccode\u003eROLLBACK\u003c/code\u003e 的会话。已经读到 EOF 的客户端也可能根本没有 SQLSTATE。这里的证据确认这些源码分支，但没有声称每次普通网络断开都会发出 08006。\u003c/p\u003e\n\u003ch3\u003e分支指引 {#scenarios}\u003c/h3\u003e\n\u003cp\u003e| 固定分支 | 它说明什么 | 首先检查什么 |\n| --- | --- | --- |\n| \u003ccode\u003epostgres_fdw\u003c/code\u003e 取消 \u003ccode\u003eWARNING\u003c/code\u003e | 已建立的外部连接上，取消请求无法发送或无法读取结果。 | 保留动态 libpq 文本、FDW 操作和本地事务状态；WARNING 本身不说明本地会话已关闭。 |\n| COPY 客户端 EOF \u003ccode\u003eERROR\u003c/code\u003e | 服务器在 COPY 相关连接仍有未完成事务时检测到 EOF。 | 触发该分支的客户端 socket 已经到达 EOF，不能在其上发送 \u003ccode\u003eROLLBACK\u003c/code\u003e 或复用；应重新连接并核对 COPY 结果。 |\n| COPY-to-stdout \u003ccode\u003eFATAL\u003c/code\u003e | 固定的 10.23 路径在 COPY 期间丢失输出连接，并使用 fatal 级别。 | 丢弃后端连接并核对已经发送或接收的数据；不能执行会话级回滚。 |\n| 普通客户端 EOF | 对端在固定服务器分支之外消失。 | 结合驱动/socket 和服务器日志；不要仅凭客户端 \u003ccode\u003enull\u003c/code\u003e SQLSTATE 指定 08006。 |\u003c/p\u003e\n\u003ch2\u003e诊断 {#diagnosis}\u003c/h2\u003e\n\u003cp\u003e关联后端 PID、操作、服务器日志字段和客户端异常。客户端断 socket 可能得到 \u003ccode\u003enull\u003c/code\u003e SQLSTATE，而服务器端 FDW 或 COPY 路径可能发出带路径特定文本的 08006。决定是否重试前，区分 08001（尚未建立连接）、08007/40003（完成结果不确定）和语句尚未执行成功的普通错误。\u003c/p\u003e\n\u003cp\u003e要同时检查严重级别和生命周期。\u003ccode\u003eWARNING\u003c/code\u003e 表示 FDW 取消分支中本地会话可能仍然存活；\u003ccode\u003eERROR\u003c/code\u003e 要检查 \u003ccode\u003eINERROR\u003c/code\u003e 还是 \u003ccode\u003eIDLE\u003c/code\u003e，必要时恢复事务；\u003ccode\u003eFATAL\u003c/code\u003e 表示后端已消失。如果客户端在 ErrorResponse 之前只读到 EOF，没有 SQLSTATE 是线路交换丢失的正常证据，不能据此认定 08006。\u003c/p\u003e\n\u003ch2\u003e处理 {#response}\u003c/h2\u003e\n\u003cp\u003e丢弃连接池标记为损坏的连接，核对远端或非幂等操作的结果，并在明确幂等策略后重试完整操作。本页只确认固定源码边界；没有用 \u003ccode\u003eRAISE\u003c/code\u003e、超时或普通断 socket 冒充实测 08006。\u003c/p\u003e\n\u003cp\u003e对另一个仍保持连接的 \u003ccode\u003eERROR\u003c/code\u003e 情形，应先回滚失败的显式事务（或回滚到围绕该操作有意建立的保存点），再决定能否重试完整操作。这个一般事务规则不能证明 COPY 客户端 EOF socket 可复用：源码分支已经检测到该客户端连接的 EOF。\u003ccode\u003eFATAL\u003c/code\u003e 或已经丢失的 socket 则要建立新会话，并在任何重放前核对结果。自动提交不会让远端或 COPY 操作自动具备幂等性，它只改变本地事务边界。\u003c/p\u003e\n\u003ch2\u003e报文 {#messages}\u003c/h2\u003e\n\u003cp\u003e固定分支包含以下不同诊断：\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ccode\u003epostgres_fdw\u003c/code\u003e 取消路径的 \u003ccode\u003eWARNING\u003c/code\u003e：\u003ccode\u003ecould not send cancel request: %s\u003c/code\u003e，其中 libpq 错误文本是动态值。\u003c/li\u003e\n\u003cli\u003e同一 FDW 路径的 \u003ccode\u003eWARNING\u003c/code\u003e：\u003ccode\u003ecould not get result of cancel request: %s\u003c/code\u003e，返回的连接错误文本是动态值。\u003c/li\u003e\n\u003cli\u003e固定 10.23 COPY 路径的 \u003ccode\u003eFATAL\u003c/code\u003e：\u003ccode\u003econnection lost during COPY to stdout\u003c/code\u003e。\u003c/li\u003e\n\u003cli\u003e固定 18.6/10.23 COPY 客户端 EOF 路径的 \u003ccode\u003eERROR\u003c/code\u003e：\u003ccode\u003eunexpected EOF on client connection with an open transaction\u003c/code\u003e。\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp\u003e证据将这些变体分开记录；普通客户端断 socket 得到的 \u003ccode\u003enull\u003c/code\u003e SQLSTATE 不能被提升为 08006。\u003c/p\u003e\n\u003cp\u003e即使报文都提到连接，\u003ccode\u003eERROR\u003c/code\u003e 与 \u003ccode\u003eFATAL\u003c/code\u003e 也有不同的恢复契约。COPY 客户端 EOF 的 \u003ccode\u003eERROR\u003c/code\u003e 分支检测到客户端 socket 已经消失；它不建立可复用 socket，也不提供在该连接上发送 \u003ccode\u003eROLLBACK\u003c/code\u003e 的路径。后者属于 COPY-to-stdout 路径，会关闭后端。本批没有自然 08006 运行，因此这些差异来自固定源码路径和文档规定的事务边界，而不是合成的 socket 实验。\u003c/p\u003e\n\u003ch2\u003e代表案例 {#case}\u003c/h2\u003e\n\u003cp\u003e本页没有选定的自然 SQL 运行。结构化证据记录的是源码或定义边界；客户端 \u003ccode\u003eRAISE\u003c/code\u003e 不能代表服务器机制。\u003c/p\u003e\n\u003ch2\u003e版本 {#versions}\u003c/h2\u003e\n\u003cp\u003e上面的生成事实表记录锁定的目录快照和最早观察到的定义。本页没有选定的自然 SQL 运行；固定的 REL_18_6/REL_10_23 源码边界不能当作实测结果，也不能据此推断所有中间版本的行为。\u003c/p\u003e\n\u003ch2\u003e相关 {#related}\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"/wiki/sqlstate/08001/\" rel=\"nofollow\"\u003e\u003ccode\u003e08001\u003c/code\u003e — sqlclient_unable_to_establish_sqlconnection\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/wiki/sqlstate/08007/\" rel=\"nofollow\"\u003e\u003ccode\u003e08007\u003c/code\u003e — transaction_resolution_unknown\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/wiki/sqlstate/40003/\" rel=\"nofollow\"\u003e\u003ccode\u003e40003\u003c/code\u003e — 相关条件\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003ch2\u003e来源 {#sources}\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ccode\u003esrc.fdw-connection-failure.18.6\u003c/code\u003e — \u003ccode\u003econtrib/postgres_fdw/connection.c\u003c/code\u003e at \u003ccode\u003eREL_18_6\u003c/code\u003e commit \u003ccode\u003e724edf9bde9d356724ad384a2e196edc3c9f80f7\u003c/code\u003e; fixed blob SHA-256 \u003ccode\u003e67fc002657f2c7df6d93cbf99c933cbc103907d1857ed77aedbb85099ea4dda0\u003c/code\u003e (\u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/contrib/postgres_fdw/connection.c#L1462-L1464\" rel=\"nofollow\"\u003esource\u003c/a\u003e).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.copy-connection-failure.10.23\u003c/code\u003e — \u003ccode\u003esrc/backend/commands/copy.c\u003c/code\u003e at \u003ccode\u003eREL_10_23\u003c/code\u003e commit \u003ccode\u003e02991e79f8f58bc208f05dcc8af0c62dbe0a6ea4\u003c/code\u003e; fixed blob SHA-256 \u003ccode\u003e0edb032be1ce8d8c90efc28e504aa9e298a2cd26cd374c85da6da0e33ed0915c\u003c/code\u003e (\u003ca href=\"https://github.com/postgres/postgres/blob/02991e79f8f58bc208f05dcc8af0c62dbe0a6ea4/src/backend/commands/copy.c#L525-L527\" rel=\"nofollow\"\u003esource\u003c/a\u003e).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.copy-client-eof.18.6\u003c/code\u003e — \u003ccode\u003esrc/backend/commands/copyfromparse.c\u003c/code\u003e at \u003ccode\u003eREL_18_6\u003c/code\u003e commit \u003ccode\u003e724edf9bde9d356724ad384a2e196edc3c9f80f7\u003c/code\u003e; fixed blob SHA-256 \u003ccode\u003ebc42754023579cd782a3cb3f144ad2c2c3d3aa46119eb7567fcdb05f2d445571\u003c/code\u003e (\u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/commands/copyfromparse.c#L276-L303\" rel=\"nofollow\"\u003esource\u003c/a\u003e).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.copy-client-eof.10.23\u003c/code\u003e — \u003ccode\u003esrc/backend/commands/copy.c\u003c/code\u003e at \u003ccode\u003eREL_10_23\u003c/code\u003e commit \u003ccode\u003e02991e79f8f58bc208f05dcc8af0c62dbe0a6ea4\u003c/code\u003e; fixed blob SHA-256 \u003ccode\u003e0edb032be1ce8d8c90efc28e504aa9e298a2cd26cd374c85da6da0e33ed0915c\u003c/code\u003e (\u003ca href=\"https://github.com/postgres/postgres/blob/02991e79f8f58bc208f05dcc8af0c62dbe0a6ea4/src/backend/commands/copy.c#L587-L614\" rel=\"nofollow\"\u003esource\u003c/a\u003e).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.calls.REL_18_6\u003c/code\u003e / \u003ccode\u003esrc.calls.REL_10_23\u003c/code\u003e — fixed local call scans, SHA-256 \u003ccode\u003e9ee8a0e81d8f0825c5c1ae45583439859a26e602bdd4ce2f2a62aa278867ccbf\u003c/code\u003e / \u003ccode\u003e00d16d3eb01b71ccf1b245c8f3102f9d0ec9f36fb02777b8dd1b99fcb263040c\u003c/code\u003e; these scans preserve the resolved call context used by the claims.\u003c/li\u003e\n\u003c/ul\u003e\n","SourceRevision":"english-manuals:27579a490920a8273428e87cff8d866374221184a614a8ca900493f2805c08e1","ContentHash":"9490d8e1275815b46c7425ecd27182e7217b58503e62622cc9f3fac353cb5f17","Payload":{"body_md":"# 08006 — 连接失败\n\n## 速览 {#at-a-glance}\n\nSQLSTATE `08006` 是 Class `08` 中的 **connection_failure**。`08006` 表示已有连接发生故障。固定路径包括 `postgres_fdw` 的取消/连接丢失处理以及 COPY 失败处理；它们没有一个适用于所有路径的主报文或严重级别，本批也有意不做普通 socket 的伪案例。\n\n\n## 含义 {#meaning}\n\n固定源码路径说明了为什么本类没有统一报文。在 `postgres_fdw` 中，取消请求失败时，在处理已有外部连接的过程中发出 `WARNING`；这是取消路径的诊断，本身不证明客户端会话已经终止。在 COPY 路径中，带有未完成事务的客户端 EOF 以 `ERROR` 报告，而较旧的 COPY-to-stdout 路径在输出连接丢失时以 `FATAL` 报告。严重级别和发生阶段都是含义的一部分，不能把它们合并成“socket 断了”。\n\n`ERROR` 分支若发生在显式事务中，仍连接着的会话可能进入 `INERROR`，调用者应先 `ROLLBACK` 或回到合适的保存点再执行无关 SQL。`FATAL` 分支会结束后端连接，不存在可以发送 `ROLLBACK` 的会话。已经读到 EOF 的客户端也可能根本没有 SQLSTATE。这里的证据确认这些源码分支，但没有声称每次普通网络断开都会发出 08006。\n\n### 分支指引 {#scenarios}\n\n| 固定分支 | 它说明什么 | 首先检查什么 |\n| --- | --- | --- |\n| `postgres_fdw` 取消 `WARNING` | 已建立的外部连接上，取消请求无法发送或无法读取结果。 | 保留动态 libpq 文本、FDW 操作和本地事务状态；WARNING 本身不说明本地会话已关闭。 |\n| COPY 客户端 EOF `ERROR` | 服务器在 COPY 相关连接仍有未完成事务时检测到 EOF。 | 触发该分支的客户端 socket 已经到达 EOF，不能在其上发送 `ROLLBACK` 或复用；应重新连接并核对 COPY 结果。 |\n| COPY-to-stdout `FATAL` | 固定的 10.23 路径在 COPY 期间丢失输出连接，并使用 fatal 级别。 | 丢弃后端连接并核对已经发送或接收的数据；不能执行会话级回滚。 |\n| 普通客户端 EOF | 对端在固定服务器分支之外消失。 | 结合驱动/socket 和服务器日志；不要仅凭客户端 `null` SQLSTATE 指定 08006。 |\n\n## 诊断 {#diagnosis}\n\n关联后端 PID、操作、服务器日志字段和客户端异常。客户端断 socket 可能得到 `null` SQLSTATE，而服务器端 FDW 或 COPY 路径可能发出带路径特定文本的 08006。决定是否重试前，区分 08001（尚未建立连接）、08007/40003（完成结果不确定）和语句尚未执行成功的普通错误。\n\n要同时检查严重级别和生命周期。`WARNING` 表示 FDW 取消分支中本地会话可能仍然存活；`ERROR` 要检查 `INERROR` 还是 `IDLE`，必要时恢复事务；`FATAL` 表示后端已消失。如果客户端在 ErrorResponse 之前只读到 EOF，没有 SQLSTATE 是线路交换丢失的正常证据，不能据此认定 08006。\n\n## 处理 {#response}\n\n丢弃连接池标记为损坏的连接，核对远端或非幂等操作的结果，并在明确幂等策略后重试完整操作。本页只确认固定源码边界；没有用 `RAISE`、超时或普通断 socket 冒充实测 08006。\n\n对另一个仍保持连接的 `ERROR` 情形，应先回滚失败的显式事务（或回滚到围绕该操作有意建立的保存点），再决定能否重试完整操作。这个一般事务规则不能证明 COPY 客户端 EOF socket 可复用：源码分支已经检测到该客户端连接的 EOF。`FATAL` 或已经丢失的 socket 则要建立新会话，并在任何重放前核对结果。自动提交不会让远端或 COPY 操作自动具备幂等性，它只改变本地事务边界。\n\n## 报文 {#messages}\n\n固定分支包含以下不同诊断：\n\n- `postgres_fdw` 取消路径的 `WARNING`：`could not send cancel request: %s`，其中 libpq 错误文本是动态值。\n- 同一 FDW 路径的 `WARNING`：`could not get result of cancel request: %s`，返回的连接错误文本是动态值。\n- 固定 10.23 COPY 路径的 `FATAL`：`connection lost during COPY to stdout`。\n- 固定 18.6/10.23 COPY 客户端 EOF 路径的 `ERROR`：`unexpected EOF on client connection with an open transaction`。\n\n证据将这些变体分开记录；普通客户端断 socket 得到的 `null` SQLSTATE 不能被提升为 08006。\n\n即使报文都提到连接，`ERROR` 与 `FATAL` 也有不同的恢复契约。COPY 客户端 EOF 的 `ERROR` 分支检测到客户端 socket 已经消失；它不建立可复用 socket，也不提供在该连接上发送 `ROLLBACK` 的路径。后者属于 COPY-to-stdout 路径，会关闭后端。本批没有自然 08006 运行，因此这些差异来自固定源码路径和文档规定的事务边界，而不是合成的 socket 实验。\n\n## 代表案例 {#case}\n\n本页没有选定的自然 SQL 运行。结构化证据记录的是源码或定义边界；客户端 `RAISE` 不能代表服务器机制。\n\n## 版本 {#versions}\n\n上面的生成事实表记录锁定的目录快照和最早观察到的定义。本页没有选定的自然 SQL 运行；固定的 REL_18_6/REL_10_23 源码边界不能当作实测结果，也不能据此推断所有中间版本的行为。\n\n## 相关 {#related}\n\n- [`08001` — sqlclient_unable_to_establish_sqlconnection](/wiki/sqlstate/08001/)\n- [`08007` — transaction_resolution_unknown](/wiki/sqlstate/08007/)\n- [`40003` — 相关条件](/wiki/sqlstate/40003/)\n\n## 来源 {#sources}\n\n- `src.fdw-connection-failure.18.6` — `contrib/postgres_fdw/connection.c` at `REL_18_6` commit `724edf9bde9d356724ad384a2e196edc3c9f80f7`; fixed blob SHA-256 `67fc002657f2c7df6d93cbf99c933cbc103907d1857ed77aedbb85099ea4dda0` ([source](https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/contrib/postgres_fdw/connection.c#L1462-L1464)).\n- `src.copy-connection-failure.10.23` — `src/backend/commands/copy.c` at `REL_10_23` commit `02991e79f8f58bc208f05dcc8af0c62dbe0a6ea4`; fixed blob SHA-256 `0edb032be1ce8d8c90efc28e504aa9e298a2cd26cd374c85da6da0e33ed0915c` ([source](https://github.com/postgres/postgres/blob/02991e79f8f58bc208f05dcc8af0c62dbe0a6ea4/src/backend/commands/copy.c#L525-L527)).\n- `src.copy-client-eof.18.6` — `src/backend/commands/copyfromparse.c` at `REL_18_6` commit `724edf9bde9d356724ad384a2e196edc3c9f80f7`; fixed blob SHA-256 `bc42754023579cd782a3cb3f144ad2c2c3d3aa46119eb7567fcdb05f2d445571` ([source](https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/commands/copyfromparse.c#L276-L303)).\n- `src.copy-client-eof.10.23` — `src/backend/commands/copy.c` at `REL_10_23` commit `02991e79f8f58bc208f05dcc8af0c62dbe0a6ea4`; fixed blob SHA-256 `0edb032be1ce8d8c90efc28e504aa9e298a2cd26cd374c85da6da0e33ed0915c` ([source](https://github.com/postgres/postgres/blob/02991e79f8f58bc208f05dcc8af0c62dbe0a6ea4/src/backend/commands/copy.c#L587-L614)).\n- `src.calls.REL_18_6` / `src.calls.REL_10_23` — fixed local call scans, SHA-256 `9ee8a0e81d8f0825c5c1ae45583439859a26e602bdd4ce2f2a62aa278867ccbf` / `00d16d3eb01b71ccf1b245c8f3102f9d0ec9f36fb02777b8dd1b99fcb263040c`; these scans preserve the resolved call context used by the claims.\n","description":"PostgreSQL SQLSTATE 08006（连接失败，connection_failure）的源码证据、诊断与处理参考。","is_stale":false,"name":"连接失败","sections":[{"anchor":"","heading":"","html":"\u0026lt;h1\u0026gt;08006 — 连接失败\u0026lt;/h1\u0026gt;"},{"anchor":"at-a-glance","heading":"速览","html":"\u003cp\u003eSQLSTATE \u003ccode\u003e08006\u003c/code\u003e 是 Class \u003ccode\u003e08\u003c/code\u003e 中的 \u003cstrong\u003econnection_failure\u003c/strong\u003e。\u003ccode\u003e08006\u003c/code\u003e 表示已有连接发生故障。固定路径包括 \u003ccode\u003epostgres_fdw\u003c/code\u003e 的取消/连接丢失处理以及 COPY 失败处理；它们没有一个适用于所有路径的主报文或严重级别，本批也有意不做普通 socket 的伪案例。\u003c/p\u003e"},{"anchor":"meaning","heading":"含义","html":"\u003cp\u003e固定源码路径说明了为什么本类没有统一报文。在 \u003ccode\u003epostgres_fdw\u003c/code\u003e 中，取消请求失败时，在处理已有外部连接的过程中发出 \u003ccode\u003eWARNING\u003c/code\u003e；这是取消路径的诊断，本身不证明客户端会话已经终止。在 COPY 路径中，带有未完成事务的客户端 EOF 以 \u003ccode\u003eERROR\u003c/code\u003e 报告，而较旧的 COPY-to-stdout 路径在输出连接丢失时以 \u003ccode\u003eFATAL\u003c/code\u003e 报告。严重级别和发生阶段都是含义的一部分，不能把它们合并成“socket 断了”。\u003c/p\u003e\n\u003cp\u003e\u003ccode\u003eERROR\u003c/code\u003e 分支若发生在显式事务中，仍连接着的会话可能进入 \u003ccode\u003eINERROR\u003c/code\u003e，调用者应先 \u003ccode\u003eROLLBACK\u003c/code\u003e 或回到合适的保存点再执行无关 SQL。\u003ccode\u003eFATAL\u003c/code\u003e 分支会结束后端连接，不存在可以发送 \u003ccode\u003eROLLBACK\u003c/code\u003e 的会话。已经读到 EOF 的客户端也可能根本没有 SQLSTATE。这里的证据确认这些源码分支，但没有声称每次普通网络断开都会发出 08006。\u003c/p\u003e\n\u003ch3 id=\"scenarios\"\u003e分支指引\u003c/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e固定分支\u003c/th\u003e\n\u003cth\u003e它说明什么\u003c/th\u003e\n\u003cth\u003e首先检查什么\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003epostgres_fdw\u003c/code\u003e 取消 \u003ccode\u003eWARNING\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003e已建立的外部连接上，取消请求无法发送或无法读取结果。\u003c/td\u003e\n\u003ctd\u003e保留动态 libpq 文本、FDW 操作和本地事务状态；WARNING 本身不说明本地会话已关闭。\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCOPY 客户端 EOF \u003ccode\u003eERROR\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003e服务器在 COPY 相关连接仍有未完成事务时检测到 EOF。\u003c/td\u003e\n\u003ctd\u003e触发该分支的客户端 socket 已经到达 EOF，不能在其上发送 \u003ccode\u003eROLLBACK\u003c/code\u003e 或复用；应重新连接并核对 COPY 结果。\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCOPY-to-stdout \u003ccode\u003eFATAL\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003e固定的 10.23 路径在 COPY 期间丢失输出连接，并使用 fatal 级别。\u003c/td\u003e\n\u003ctd\u003e丢弃后端连接并核对已经发送或接收的数据；不能执行会话级回滚。\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e普通客户端 EOF\u003c/td\u003e\n\u003ctd\u003e对端在固定服务器分支之外消失。\u003c/td\u003e\n\u003ctd\u003e结合驱动/socket 和服务器日志；不要仅凭客户端 \u003ccode\u003enull\u003c/code\u003e SQLSTATE 指定 08006。\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e"},{"anchor":"diagnosis","heading":"诊断","html":"\u003cp\u003e关联后端 PID、操作、服务器日志字段和客户端异常。客户端断 socket 可能得到 \u003ccode\u003enull\u003c/code\u003e SQLSTATE，而服务器端 FDW 或 COPY 路径可能发出带路径特定文本的 08006。决定是否重试前，区分 08001（尚未建立连接）、08007/40003（完成结果不确定）和语句尚未执行成功的普通错误。\u003c/p\u003e\n\u003cp\u003e要同时检查严重级别和生命周期。\u003ccode\u003eWARNING\u003c/code\u003e 表示 FDW 取消分支中本地会话可能仍然存活；\u003ccode\u003eERROR\u003c/code\u003e 要检查 \u003ccode\u003eINERROR\u003c/code\u003e 还是 \u003ccode\u003eIDLE\u003c/code\u003e，必要时恢复事务；\u003ccode\u003eFATAL\u003c/code\u003e 表示后端已消失。如果客户端在 ErrorResponse 之前只读到 EOF，没有 SQLSTATE 是线路交换丢失的正常证据，不能据此认定 08006。\u003c/p\u003e"},{"anchor":"response","heading":"处理","html":"\u003cp\u003e丢弃连接池标记为损坏的连接，核对远端或非幂等操作的结果，并在明确幂等策略后重试完整操作。本页只确认固定源码边界；没有用 \u003ccode\u003eRAISE\u003c/code\u003e、超时或普通断 socket 冒充实测 08006。\u003c/p\u003e\n\u003cp\u003e对另一个仍保持连接的 \u003ccode\u003eERROR\u003c/code\u003e 情形，应先回滚失败的显式事务（或回滚到围绕该操作有意建立的保存点），再决定能否重试完整操作。这个一般事务规则不能证明 COPY 客户端 EOF socket 可复用：源码分支已经检测到该客户端连接的 EOF。\u003ccode\u003eFATAL\u003c/code\u003e 或已经丢失的 socket 则要建立新会话，并在任何重放前核对结果。自动提交不会让远端或 COPY 操作自动具备幂等性，它只改变本地事务边界。\u003c/p\u003e"},{"anchor":"messages","heading":"报文","html":"\u003cp\u003e固定分支包含以下不同诊断：\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ccode\u003epostgres_fdw\u003c/code\u003e 取消路径的 \u003ccode\u003eWARNING\u003c/code\u003e：\u003ccode\u003ecould not send cancel request: %s\u003c/code\u003e，其中 libpq 错误文本是动态值。\u003c/li\u003e\n\u003cli\u003e同一 FDW 路径的 \u003ccode\u003eWARNING\u003c/code\u003e：\u003ccode\u003ecould not get result of cancel request: %s\u003c/code\u003e，返回的连接错误文本是动态值。\u003c/li\u003e\n\u003cli\u003e固定 10.23 COPY 路径的 \u003ccode\u003eFATAL\u003c/code\u003e：\u003ccode\u003econnection lost during COPY to stdout\u003c/code\u003e。\u003c/li\u003e\n\u003cli\u003e固定 18.6/10.23 COPY 客户端 EOF 路径的 \u003ccode\u003eERROR\u003c/code\u003e：\u003ccode\u003eunexpected EOF on client connection with an open transaction\u003c/code\u003e。\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp\u003e证据将这些变体分开记录；普通客户端断 socket 得到的 \u003ccode\u003enull\u003c/code\u003e SQLSTATE 不能被提升为 08006。\u003c/p\u003e\n\u003cp\u003e即使报文都提到连接，\u003ccode\u003eERROR\u003c/code\u003e 与 \u003ccode\u003eFATAL\u003c/code\u003e 也有不同的恢复契约。COPY 客户端 EOF 的 \u003ccode\u003eERROR\u003c/code\u003e 分支检测到客户端 socket 已经消失；它不建立可复用 socket，也不提供在该连接上发送 \u003ccode\u003eROLLBACK\u003c/code\u003e 的路径。后者属于 COPY-to-stdout 路径，会关闭后端。本批没有自然 08006 运行，因此这些差异来自固定源码路径和文档规定的事务边界，而不是合成的 socket 实验。\u003c/p\u003e"},{"anchor":"case","heading":"代表案例","html":"\u003cp\u003e本页没有选定的自然 SQL 运行。结构化证据记录的是源码或定义边界；客户端 \u003ccode\u003eRAISE\u003c/code\u003e 不能代表服务器机制。\u003c/p\u003e"},{"anchor":"versions","heading":"版本","html":"\u003cp\u003e上面的生成事实表记录锁定的目录快照和最早观察到的定义。本页没有选定的自然 SQL 运行；固定的 REL_18_6/REL_10_23 源码边界不能当作实测结果，也不能据此推断所有中间版本的行为。\u003c/p\u003e"},{"anchor":"related","heading":"相关","html":"\u003cul\u003e\n\u003cli\u003e\u003ca href=\"/wiki/sqlstate/08001/\"\u003e\u003ccode\u003e08001\u003c/code\u003e — sqlclient_unable_to_establish_sqlconnection\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/wiki/sqlstate/08007/\"\u003e\u003ccode\u003e08007\u003c/code\u003e — transaction_resolution_unknown\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/wiki/sqlstate/40003/\"\u003e\u003ccode\u003e40003\u003c/code\u003e — 相关条件\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e"},{"anchor":"sources","heading":"来源","html":"\u003cul\u003e\n\u003cli\u003e\u003ccode\u003esrc.fdw-connection-failure.18.6\u003c/code\u003e — \u003ccode\u003econtrib/postgres_fdw/connection.c\u003c/code\u003e at \u003ccode\u003eREL_18_6\u003c/code\u003e commit \u003ccode\u003e724edf9bde9d356724ad384a2e196edc3c9f80f7\u003c/code\u003e; fixed blob SHA-256 \u003ccode\u003e67fc002657f2c7df6d93cbf99c933cbc103907d1857ed77aedbb85099ea4dda0\u003c/code\u003e (\u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/contrib/postgres_fdw/connection.c#L1462-L1464\"\u003esource\u003c/a\u003e).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.copy-connection-failure.10.23\u003c/code\u003e — \u003ccode\u003esrc/backend/commands/copy.c\u003c/code\u003e at \u003ccode\u003eREL_10_23\u003c/code\u003e commit \u003ccode\u003e02991e79f8f58bc208f05dcc8af0c62dbe0a6ea4\u003c/code\u003e; fixed blob SHA-256 \u003ccode\u003e0edb032be1ce8d8c90efc28e504aa9e298a2cd26cd374c85da6da0e33ed0915c\u003c/code\u003e (\u003ca href=\"https://github.com/postgres/postgres/blob/02991e79f8f58bc208f05dcc8af0c62dbe0a6ea4/src/backend/commands/copy.c#L525-L527\"\u003esource\u003c/a\u003e).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.copy-client-eof.18.6\u003c/code\u003e — \u003ccode\u003esrc/backend/commands/copyfromparse.c\u003c/code\u003e at \u003ccode\u003eREL_18_6\u003c/code\u003e commit \u003ccode\u003e724edf9bde9d356724ad384a2e196edc3c9f80f7\u003c/code\u003e; fixed blob SHA-256 \u003ccode\u003ebc42754023579cd782a3cb3f144ad2c2c3d3aa46119eb7567fcdb05f2d445571\u003c/code\u003e (\u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/commands/copyfromparse.c#L276-L303\"\u003esource\u003c/a\u003e).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.copy-client-eof.10.23\u003c/code\u003e — \u003ccode\u003esrc/backend/commands/copy.c\u003c/code\u003e at \u003ccode\u003eREL_10_23\u003c/code\u003e commit \u003ccode\u003e02991e79f8f58bc208f05dcc8af0c62dbe0a6ea4\u003c/code\u003e; fixed blob SHA-256 \u003ccode\u003e0edb032be1ce8d8c90efc28e504aa9e298a2cd26cd374c85da6da0e33ed0915c\u003c/code\u003e (\u003ca href=\"https://github.com/postgres/postgres/blob/02991e79f8f58bc208f05dcc8af0c62dbe0a6ea4/src/backend/commands/copy.c#L587-L614\"\u003esource\u003c/a\u003e).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.calls.REL_18_6\u003c/code\u003e / \u003ccode\u003esrc.calls.REL_10_23\u003c/code\u003e — fixed local call scans, SHA-256 \u003ccode\u003e9ee8a0e81d8f0825c5c1ae45583439859a26e602bdd4ce2f2a62aa278867ccbf\u003c/code\u003e / \u003ccode\u003e00d16d3eb01b71ccf1b245c8f3102f9d0ec9f36fb02777b8dd1b99fcb263040c\u003c/code\u003e; these scans preserve the resolved call context used by the claims.\u003c/li\u003e\n\u003c/ul\u003e"}],"summary":"与服务器的连接在会话中途失败。","title":"08006 — 连接失败（connection_failure）","translation_source_rev":"db1ad3240afc7dafac8ebf016270e3f5a691215e1e77069a17b15445740dc75a"}},"RequestedLocale":"zh-Hans","Fallback":false,"Versions":["10","11","12","13","14","15","16","17","18","19","20","8.1","8.2","8.3","8.4","9.0","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":"7.4","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 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in a PostgreSQL release definition file is established; runtime throw/use scanning is maintained 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