{"Entry":{"collection":"sqlstate","key":"53300","name":"53300","aliases":[],"metadata":{"aliases":[],"case_count":1,"class_code":"53","condition_name":"too_many_connections","condition_names":["too_many_connections"],"content_hash":"8bdb2035461c658b39ab5f543f4c63aeccbbd5d2125c96c866d0afd4e61c54df","depth":"full","editorial_review":"reviewed","evidence_tier":"observed_runtime","imported_at":"2026-09-30T17:45:27.817399+08:00","introduced":null,"known_present_by":"7.4","macros":["ERRCODE_TOO_MANY_CONNECTIONS"],"name_zh":"连接数过多","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_TOO_MANY_CONNECTIONS","removed":null,"runtime_verification":"passed","severity_classes":["E"],"snippet_count":1,"source_rev":"english-manuals:ef69e2e58a5dd983283ff6c6091d86a6169973084e94f1cfd1ee1970a7308797","sqlstate":"53300","status":"active","summary_zh":"连接数达到角色、库或服务器上限，新连接被拒。"}},"Definition":{"Collection":"sqlstate","Key":"53300","SourceDatabase":"center","Version":"18","SourceTable":"sqlstate","SourceKey":"53300","SourceRevision":"english-manuals:ef69e2e58a5dd983283ff6c6091d86a6169973084e94f1cfd1ee1970a7308797","Facts":{"aliases":[],"class_name":"Insufficient Resources","condition_name":"too_many_connections","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"56dacf78e618ff0fd8c533e05db597b80d7ebbad7f8e512a888217d0640aa328","slug":"18"},"lang":"en","sqlstate":"53300"},"ManualEvidence":{"doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"56dacf78e618ff0fd8c533e05db597b80d7ebbad7f8e512a888217d0640aa328","slug":"18"}},"MeasuredEvidence":{}},"Text":{"Collection":"sqlstate","Key":"53300","SourceDatabase":"center","Version":"","Locale":"en","Title":"53300 — too_many_connections","Summary":"53300 is PostgreSQL's toomanyconnections condition in Class 53, insufficient_resources. It is emitted when a new backend cannot be admitted because a connection capacity limit has been reached. The representative case uses a role connection limit of one and opens a second session for that role.","BodyHTML":"\u003ch2\u003eAt a glance {#at-a-glance}\u003c/h2\u003e\n\u003cp\u003e\u003ccode\u003e53300\u003c/code\u003e is PostgreSQL\u0026#39;s \u003ccode\u003etoo_many_connections\u003c/code\u003e condition in Class 53, \u003ccode\u003einsufficient_resources\u003c/code\u003e. It is emitted when a new backend cannot be admitted because a connection capacity limit has been reached. The representative case uses a role connection limit of one and opens a second session for that role.\u003c/p\u003e\n\u003cp\u003eThis is a connection-startup failure. No SQL transaction is opened for the rejected session. In the final runs, psycopg reported the startup exception text but exposed \u003ccode\u003esqlstate=None\u003c/code\u003e; the PostgreSQL collector recorded the server\u0026#39;s actual \u003ccode\u003eFATAL\u003c/code\u003e SQLSTATE \u003ccode\u003e53300\u003c/code\u003e. Keep those observations separate when diagnosing a connection pool or an authentication gateway.\u003c/p\u003e\n\u003cp\u003eThe case \u003ccode\u003erole_connection_limit\u003c/code\u003e passed on PostgreSQL 18.6 and the isolated PostgreSQL 10.21 target. The run IDs and per-case assertions are retained in the \u003ca href=\"#sources\" rel=\"nofollow\"\u003epublic evidence JSON\u003c/a\u003e.\u003c/p\u003e\n\u003ch2\u003eMeaning and trigger paths {#meaning}\u003c/h2\u003e\n\u003cp\u003eDuring backend startup, PostgreSQL checks the authenticated role\u0026#39;s \u003ccode\u003erolconnlimit\u003c/code\u003e after creating the backend bookkeeping entry. For a non-superuser role with a nonnegative limit, a count above that limit raises \u003ccode\u003eFATAL\u003c/code\u003e with \u003ccode\u003eERRCODE_TOO_MANY_CONNECTIONS\u003c/code\u003e and the message \u003ccode\u003etoo many connections for role \u0026#34;%s\u0026#34;\u003c/code\u003e. The source comments describe this role count as approximate because simultaneous startups can race.\u003c/p\u003e\n\u003cp\u003eThe same SQLSTATE can identify another capacity path, such as a server-wide client limit. The role-limit case here does not establish the cause of every \u003ccode\u003e53300\u003c/code\u003e; use the primary message, collector fields, and the configured role, database, and server limits to classify it.\u003c/p\u003e\n\u003cp\u003eBecause the failure occurs before the SQL protocol reaches a transaction, transaction status is not \u003ccode\u003eINERROR\u003c/code\u003e or \u003ccode\u003eIDLE\u003c/code\u003e for the rejected session. A management or pool connection that remains open can change the limit and then prove recovery with a new session.\u003c/p\u003e\n\u003ch2\u003eMessages and diagnostics {#messages}\u003c/h2\u003e\n\u003cp\u003eThe executable excerpt uses the same role-limit SQL statements as the runner. \u003ccode\u003elimited_user\u003c/code\u003e is replaced by a disposable role in the isolated run. The second connection is a separate client-startup operation, so it is described between the SQL statements rather than represented by a fabricated SQL command.\u003c/p\u003e\n\u003cpre\u003e\u003ccode\u003eALTER ROLE limited_user CONNECTION LIMIT 1;\n-- Keep one session open as limited_user.\n-- Open a second session as limited_user: startup returns FATAL 53300.\nALTER ROLE limited_user CONNECTION LIMIT -1;\nSELECT 1;\n\u003c/code\u003e\u003c/pre\u003e\n\u003cp\u003eThe latest target\u0026#39;s collector record was:\u003c/p\u003e\n\u003cpre\u003e\u003ccode\u003eSQLSTATE: 53300                 # csvlog/jsonlog sql_state_code\nseverity: FATAL\nmessage_primary: too many connections for role \u0026#34;\u0026lt;generated-role\u0026gt;\u0026#34;\nsource: miscinit.c / InitializeSessionUserId / line 880\ndriver startup sqlstate: null\ntransaction: none opened\nrepair: reset CONNECTION LIMIT; fresh role connection SELECT 1 -\u0026gt; 1\n\u003c/code\u003e\u003c/pre\u003e\n\u003cp\u003ePostgreSQL 10.21 produced the same message and SQLSTATE in its collector, with the source location \u003ccode\u003emiscinit.c:575\u003c/code\u003e. In both targets the known role connection succeeded after the limit was reset. The role name and port above are run-generated values; the collector\u0026#39;s \u003ccode\u003esql_state_code\u003c/code\u003e is the server evidence. A startup error may not expose a SQLSTATE property through a particular driver.\u003c/p\u003e\n\u003ch2\u003eDiagnosis {#diagnosis}\u003c/h2\u003e\n\u003cp\u003eCapture the connection parameters without secrets, the role and database, the server version, the exact startup text, and a collector record correlated by time, user, and connection source. Check \u003ccode\u003epg_roles.rolconnlimit\u003c/code\u003e, database and server connection settings, and current backend counts. A pool can exhaust a role limit while the server still has global capacity.\u003c/p\u003e\n\u003cp\u003eTreat the role count as a capacity observation rather than an exact admission proof under a burst: PostgreSQL documents an approximate check for concurrent startups. Check the primary message before changing a global setting, and preserve an administrative path for recovery.\u003c/p\u003e\n\u003cp\u003eDo not issue transaction cleanup commands for the rejected session. It never reached a usable SQL transaction. A still-open owner or administration connection can restore the setting; the meaningful repair assertion is a fresh login for the affected role followed by a real query.\u003c/p\u003e\n\u003ch2\u003eResponse and repair {#response}\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBound pool size and connection concurrency so a role does not repeatedly exhaust its limit.\u003c/li\u003e\n\u003cli\u003eIncrease the role, database, or server capacity only after checking memory, workload, and the intended admission policy.\u003c/li\u003e\n\u003cli\u003eKeep reserved capacity and a controlled administrative connection for recovery; do not grant superuser status merely to bypass a limit.\u003c/li\u003e\n\u003cli\u003eAfter changing the limit, open a new connection and execute a harmless query. Reconcile pool state and close stale sessions before retrying application work.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp\u003eThe representative repair reset the disposable role\u0026#39;s limit, opened a new role connection, and observed \u003ccode\u003eSELECT 1\u003c/code\u003e as \u003ccode\u003e1\u003c/code\u003e. That proves recovery of this role-limit path; it does not prove that a different database-wide or server-wide capacity failure has been repaired.\u003c/p\u003e\n\u003ch2\u003eVersions and boundaries {#versions}\u003c/h2\u003e\n\u003cp\u003eThe catalogue has a definition-presence observation for \u003ccode\u003e53300\u003c/code\u003e at PostgreSQL 7.4 and through the locked 8.4.22 pre-9.0 definitions, then in every listed formal snapshot through PostgreSQL 18.6 and the PostgreSQL 19 Beta 3 preview. This is a definition-only presence boundary, not an exact implementation introduction or runtime-use claim. The class title change between the 9.0 header and 9.1 text definitions is recorded in the catalogue; it is not an asserted implementation change for this condition.\u003c/p\u003e\n\u003cp\u003eThe role-limit case passed on PostgreSQL 18.6 and 10.21. Source line numbers differ, and the driver/collector split is part of the observed boundary. Database-wide and server-wide capacity paths, connection pool behavior, and operating-system resource exhaustion require their own evidence.\u003c/p\u003e\n\u003ch2\u003eRelated {#related}\u003c/h2\u003e\n\u003cp\u003e\u003ca href=\"/wiki/sqlstate/28P01/\" rel=\"nofollow\"\u003e\u003ccode\u003e28P01\u003c/code\u003e — \u003ccode\u003einvalid_password\u003c/code\u003e\u003c/a\u003e is another connection-startup failure with no SQL transaction. \u003ca href=\"/wiki/sqlstate/57014/\" rel=\"nofollow\"\u003e\u003ccode\u003e57014\u003c/code\u003e — \u003ccode\u003equery_canceled\u003c/code\u003e\u003c/a\u003e is a statement interruption after a session has connected. \u003ca href=\"/wiki/sqlstate/42P01/\" rel=\"nofollow\"\u003e\u003ccode\u003e42P01\u003c/code\u003e — \u003ccode\u003eundefined_table\u003c/code\u003e\u003c/a\u003e is a SQL name-resolution error after connection startup.\u003c/p\u003e\n\u003ch2\u003eSources {#sources}\u003c/h2\u003e\n\u003cp\u003eStructured evidence is recorded in the \u003ca href=\"#sources\" rel=\"nofollow\"\u003epublic evidence JSON\u003c/a\u003e. Source records are fixed to PostgreSQL commit \u003ccode\u003e724edf9bde9d356724ad384a2e196edc3c9f80f7\u003c/code\u003e; runtime records retain the collector output, driver observation, both target IDs, and structured observations.\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ccode\u003esrc.errcodes.18.6\u003c/code\u003e — \u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/errcodes.txt#L407-L414\" rel=\"nofollow\"\u003e\u003ccode\u003eerrcodes.txt\u003c/code\u003e\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.miscinit.18.6\u003c/code\u003e — \u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/init/miscinit.c#L868-L880\" rel=\"nofollow\"\u003e\u003ccode\u003emiscinit.c\u003c/code\u003e\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.backend-startup.18.6\u003c/code\u003e — \u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/tcop/backend_startup.c#L340-L344\" rel=\"nofollow\"\u003e\u003ccode\u003ebackend_startup.c\u003c/code\u003e\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003edoc.protocol.18\u003c/code\u003e — \u003ca href=\"/docs/18/protocol-error-fields.html\" rel=\"nofollow\"\u003eError and Notice Message Fields\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003eRuntime: \u003ccode\u003e53300-registry-final-20260909\u003c/code\u003e on latest and pg10; structured observations are in the \u003ca href=\"#sources\" rel=\"nofollow\"\u003epublic evidence JSON\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n","SourceRevision":"english-manuals:ef69e2e58a5dd983283ff6c6091d86a6169973084e94f1cfd1ee1970a7308797","ContentHash":"e17173a8607db3f9479f7e3266825fdebca34c09ece9264c5118dd0f46b80106","Payload":{"body_md":"\n## At a glance {#at-a-glance}\n\n`53300` is PostgreSQL's `too_many_connections` condition in Class 53, `insufficient_resources`. It is emitted when a new backend cannot be admitted because a connection capacity limit has been reached. The representative case uses a role connection limit of one and opens a second session for that role.\n\nThis is a connection-startup failure. No SQL transaction is opened for the rejected session. In the final runs, psycopg reported the startup exception text but exposed `sqlstate=None`; the PostgreSQL collector recorded the server's actual `FATAL` SQLSTATE `53300`. Keep those observations separate when diagnosing a connection pool or an authentication gateway.\n\nThe case `role_connection_limit` passed on PostgreSQL 18.6 and the isolated PostgreSQL 10.21 target. The run IDs and per-case assertions are retained in the [public evidence JSON](#sources).\n\n\n## Meaning and trigger paths {#meaning}\n\nDuring backend startup, PostgreSQL checks the authenticated role's `rolconnlimit` after creating the backend bookkeeping entry. For a non-superuser role with a nonnegative limit, a count above that limit raises `FATAL` with `ERRCODE_TOO_MANY_CONNECTIONS` and the message `too many connections for role \"%s\"`. The source comments describe this role count as approximate because simultaneous startups can race.\n\nThe same SQLSTATE can identify another capacity path, such as a server-wide client limit. The role-limit case here does not establish the cause of every `53300`; use the primary message, collector fields, and the configured role, database, and server limits to classify it.\n\nBecause the failure occurs before the SQL protocol reaches a transaction, transaction status is not `INERROR` or `IDLE` for the rejected session. A management or pool connection that remains open can change the limit and then prove recovery with a new session.\n\n## Messages and diagnostics {#messages}\n\nThe executable excerpt uses the same role-limit SQL statements as the runner. `limited_user` is replaced by a disposable role in the isolated run. The second connection is a separate client-startup operation, so it is described between the SQL statements rather than represented by a fabricated SQL command.\n\n```sql\nALTER ROLE limited_user CONNECTION LIMIT 1;\n-- Keep one session open as limited_user.\n-- Open a second session as limited_user: startup returns FATAL 53300.\nALTER ROLE limited_user CONNECTION LIMIT -1;\nSELECT 1;\n```\n\nThe latest target's collector record was:\n\n```text\nSQLSTATE: 53300                 # csvlog/jsonlog sql_state_code\nseverity: FATAL\nmessage_primary: too many connections for role \"\u003cgenerated-role\u003e\"\nsource: miscinit.c / InitializeSessionUserId / line 880\ndriver startup sqlstate: null\ntransaction: none opened\nrepair: reset CONNECTION LIMIT; fresh role connection SELECT 1 -\u003e 1\n```\n\nPostgreSQL 10.21 produced the same message and SQLSTATE in its collector, with the source location `miscinit.c:575`. In both targets the known role connection succeeded after the limit was reset. The role name and port above are run-generated values; the collector's `sql_state_code` is the server evidence. A startup error may not expose a SQLSTATE property through a particular driver.\n\n## Diagnosis {#diagnosis}\n\nCapture the connection parameters without secrets, the role and database, the server version, the exact startup text, and a collector record correlated by time, user, and connection source. Check `pg_roles.rolconnlimit`, database and server connection settings, and current backend counts. A pool can exhaust a role limit while the server still has global capacity.\n\nTreat the role count as a capacity observation rather than an exact admission proof under a burst: PostgreSQL documents an approximate check for concurrent startups. Check the primary message before changing a global setting, and preserve an administrative path for recovery.\n\nDo not issue transaction cleanup commands for the rejected session. It never reached a usable SQL transaction. A still-open owner or administration connection can restore the setting; the meaningful repair assertion is a fresh login for the affected role followed by a real query.\n\n## Response and repair {#response}\n\n- Bound pool size and connection concurrency so a role does not repeatedly exhaust its limit.\n- Increase the role, database, or server capacity only after checking memory, workload, and the intended admission policy.\n- Keep reserved capacity and a controlled administrative connection for recovery; do not grant superuser status merely to bypass a limit.\n- After changing the limit, open a new connection and execute a harmless query. Reconcile pool state and close stale sessions before retrying application work.\n\nThe representative repair reset the disposable role's limit, opened a new role connection, and observed `SELECT 1` as `1`. That proves recovery of this role-limit path; it does not prove that a different database-wide or server-wide capacity failure has been repaired.\n\n## Versions and boundaries {#versions}\n\nThe catalogue has a definition-presence observation for `53300` at PostgreSQL 7.4 and through the locked 8.4.22 pre-9.0 definitions, then in every listed formal snapshot through PostgreSQL 18.6 and the PostgreSQL 19 Beta 3 preview. This is a definition-only presence boundary, not an exact implementation introduction or runtime-use claim. The class title change between the 9.0 header and 9.1 text definitions is recorded in the catalogue; it is not an asserted implementation change for this condition.\n\nThe role-limit case passed on PostgreSQL 18.6 and 10.21. Source line numbers differ, and the driver/collector split is part of the observed boundary. Database-wide and server-wide capacity paths, connection pool behavior, and operating-system resource exhaustion require their own evidence.\n\n## Related {#related}\n\n[`28P01` — `invalid_password`](/wiki/sqlstate/28P01/) is another connection-startup failure with no SQL transaction. [`57014` — `query_canceled`](/wiki/sqlstate/57014/) is a statement interruption after a session has connected. [`42P01` — `undefined_table`](/wiki/sqlstate/42P01/) is a SQL name-resolution error after connection startup.\n\n## Sources {#sources}\n\nStructured evidence is recorded in the [public evidence JSON](#sources). Source records are fixed to PostgreSQL commit `724edf9bde9d356724ad384a2e196edc3c9f80f7`; runtime records retain the collector output, driver observation, both target IDs, and structured observations.\n\n- `src.errcodes.18.6` — [`errcodes.txt`](https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/errcodes.txt#L407-L414)\n- `src.miscinit.18.6` — [`miscinit.c`](https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/init/miscinit.c#L868-L880)\n- `src.backend-startup.18.6` — [`backend_startup.c`](https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/tcop/backend_startup.c#L340-L344)\n- `doc.protocol.18` — [Error and Notice Message Fields](/docs/18/protocol-error-fields.html)\n- Runtime: `53300-registry-final-20260909` on latest and pg10; structured observations are in the [public evidence JSON](#sources)\n","description":"PostgreSQL reports SQLSTATE 53300 when a connection cannot be admitted because a connection limit is exhausted. Identify the role, database, or server limit and verify a fresh connection after capacity is restored.","is_stale":false,"name":"","sections":[{"anchor":"at-a-glance","heading":"At a glance","html":"\u003cp\u003e\u003ccode\u003e53300\u003c/code\u003e is PostgreSQL's \u003ccode\u003etoo_many_connections\u003c/code\u003e condition in Class 53, \u003ccode\u003einsufficient_resources\u003c/code\u003e. It is emitted when a new backend cannot be admitted because a connection capacity limit has been reached. The representative case uses a role connection limit of one and opens a second session for that role.\u003c/p\u003e\n\u003cp\u003eThis is a connection-startup failure. No SQL transaction is opened for the rejected session. In the final runs, psycopg reported the startup exception text but exposed \u003ccode\u003esqlstate=None\u003c/code\u003e; the PostgreSQL collector recorded the server's actual \u003ccode\u003eFATAL\u003c/code\u003e SQLSTATE \u003ccode\u003e53300\u003c/code\u003e. Keep those observations separate when diagnosing a connection pool or an authentication gateway.\u003c/p\u003e\n\u003cp\u003eThe case \u003ccode\u003erole_connection_limit\u003c/code\u003e passed on PostgreSQL 18.6 and the isolated PostgreSQL 10.21 target. The run IDs and per-case assertions are retained in the \u003ca href=\"#sources\"\u003epublic evidence JSON\u003c/a\u003e.\u003c/p\u003e"},{"anchor":"meaning","heading":"Meaning and trigger paths","html":"\u003cp\u003eDuring backend startup, PostgreSQL checks the authenticated role's \u003ccode\u003erolconnlimit\u003c/code\u003e after creating the backend bookkeeping entry. For a non-superuser role with a nonnegative limit, a count above that limit raises \u003ccode\u003eFATAL\u003c/code\u003e with \u003ccode\u003eERRCODE_TOO_MANY_CONNECTIONS\u003c/code\u003e and the message \u003ccode\u003etoo many connections for role \"%s\"\u003c/code\u003e. The source comments describe this role count as approximate because simultaneous startups can race.\u003c/p\u003e\n\u003cp\u003eThe same SQLSTATE can identify another capacity path, such as a server-wide client limit. The role-limit case here does not establish the cause of every \u003ccode\u003e53300\u003c/code\u003e; use the primary message, collector fields, and the configured role, database, and server limits to classify it.\u003c/p\u003e\n\u003cp\u003eBecause the failure occurs before the SQL protocol reaches a transaction, transaction status is not \u003ccode\u003eINERROR\u003c/code\u003e or \u003ccode\u003eIDLE\u003c/code\u003e for the rejected session. A management or pool connection that remains open can change the limit and then prove recovery with a new session.\u003c/p\u003e"},{"anchor":"messages","heading":"Messages and diagnostics","html":"\u003cp\u003eThe executable excerpt uses the same role-limit SQL statements as the runner. \u003ccode\u003elimited_user\u003c/code\u003e is replaced by a disposable role in the isolated run. The second connection is a separate client-startup operation, so it is described between the SQL statements rather than represented by a fabricated SQL command.\u003c/p\u003e\n\u003cpre\u003e\u003ccode class=\"language-sql\"\u003eALTER ROLE limited_user CONNECTION LIMIT 1;\n-- Keep one session open as limited_user.\n-- Open a second session as limited_user: startup returns FATAL 53300.\nALTER ROLE limited_user CONNECTION LIMIT -1;\nSELECT 1;\n\u003c/code\u003e\u003c/pre\u003e\n\u003cp\u003eThe latest target's collector record was:\u003c/p\u003e\n\u003cpre\u003e\u003ccode class=\"language-text\"\u003eSQLSTATE: 53300                 # csvlog/jsonlog sql_state_code\nseverity: FATAL\nmessage_primary: too many connections for role \u0026quot;\u0026lt;generated-role\u0026gt;\u0026quot;\nsource: miscinit.c / InitializeSessionUserId / line 880\ndriver startup sqlstate: null\ntransaction: none opened\nrepair: reset CONNECTION LIMIT; fresh role connection SELECT 1 -\u0026gt; 1\n\u003c/code\u003e\u003c/pre\u003e\n\u003cp\u003ePostgreSQL 10.21 produced the same message and SQLSTATE in its collector, with the source location \u003ccode\u003emiscinit.c:575\u003c/code\u003e. In both targets the known role connection succeeded after the limit was reset. The role name and port above are run-generated values; the collector's \u003ccode\u003esql_state_code\u003c/code\u003e is the server evidence. A startup error may not expose a SQLSTATE property through a particular driver.\u003c/p\u003e"},{"anchor":"diagnosis","heading":"Diagnosis","html":"\u003cp\u003eCapture the connection parameters without secrets, the role and database, the server version, the exact startup text, and a collector record correlated by time, user, and connection source. Check \u003ccode\u003epg_roles.rolconnlimit\u003c/code\u003e, database and server connection settings, and current backend counts. A pool can exhaust a role limit while the server still has global capacity.\u003c/p\u003e\n\u003cp\u003eTreat the role count as a capacity observation rather than an exact admission proof under a burst: PostgreSQL documents an approximate check for concurrent startups. Check the primary message before changing a global setting, and preserve an administrative path for recovery.\u003c/p\u003e\n\u003cp\u003eDo not issue transaction cleanup commands for the rejected session. It never reached a usable SQL transaction. A still-open owner or administration connection can restore the setting; the meaningful repair assertion is a fresh login for the affected role followed by a real query.\u003c/p\u003e"},{"anchor":"response","heading":"Response and repair","html":"\u003cul\u003e\n\u003cli\u003eBound pool size and connection concurrency so a role does not repeatedly exhaust its limit.\u003c/li\u003e\n\u003cli\u003eIncrease the role, database, or server capacity only after checking memory, workload, and the intended admission policy.\u003c/li\u003e\n\u003cli\u003eKeep reserved capacity and a controlled administrative connection for recovery; do not grant superuser status merely to bypass a limit.\u003c/li\u003e\n\u003cli\u003eAfter changing the limit, open a new connection and execute a harmless query. Reconcile pool state and close stale sessions before retrying application work.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp\u003eThe representative repair reset the disposable role's limit, opened a new role connection, and observed \u003ccode\u003eSELECT 1\u003c/code\u003e as \u003ccode\u003e1\u003c/code\u003e. That proves recovery of this role-limit path; it does not prove that a different database-wide or server-wide capacity failure has been repaired.\u003c/p\u003e"},{"anchor":"versions","heading":"Versions and boundaries","html":"\u003cp\u003eThe catalogue has a definition-presence observation for \u003ccode\u003e53300\u003c/code\u003e at PostgreSQL 7.4 and through the locked 8.4.22 pre-9.0 definitions, then in every listed formal snapshot through PostgreSQL 18.6 and the PostgreSQL 19 Beta 3 preview. This is a definition-only presence boundary, not an exact implementation introduction or runtime-use claim. The class title change between the 9.0 header and 9.1 text definitions is recorded in the catalogue; it is not an asserted implementation change for this condition.\u003c/p\u003e\n\u003cp\u003eThe role-limit case passed on PostgreSQL 18.6 and 10.21. Source line numbers differ, and the driver/collector split is part of the observed boundary. Database-wide and server-wide capacity paths, connection pool behavior, and operating-system resource exhaustion require their own evidence.\u003c/p\u003e"},{"anchor":"related","heading":"Related","html":"\u003cp\u003e\u003ca href=\"/wiki/sqlstate/28P01/\"\u003e\u003ccode\u003e28P01\u003c/code\u003e — \u003ccode\u003einvalid_password\u003c/code\u003e\u003c/a\u003e is another connection-startup failure with no SQL transaction. \u003ca href=\"/wiki/sqlstate/57014/\"\u003e\u003ccode\u003e57014\u003c/code\u003e — \u003ccode\u003equery_canceled\u003c/code\u003e\u003c/a\u003e is a statement interruption after a session has connected. \u003ca href=\"/wiki/sqlstate/42P01/\"\u003e\u003ccode\u003e42P01\u003c/code\u003e — \u003ccode\u003eundefined_table\u003c/code\u003e\u003c/a\u003e is a SQL name-resolution error after connection startup.\u003c/p\u003e"},{"anchor":"sources","heading":"Sources","html":"\u003cp\u003eStructured evidence is recorded in the \u003ca href=\"#sources\"\u003epublic evidence JSON\u003c/a\u003e. Source records are fixed to PostgreSQL commit \u003ccode\u003e724edf9bde9d356724ad384a2e196edc3c9f80f7\u003c/code\u003e; runtime records retain the collector output, driver observation, both target IDs, and structured observations.\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ccode\u003esrc.errcodes.18.6\u003c/code\u003e — \u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/errcodes.txt#L407-L414\"\u003e\u003ccode\u003eerrcodes.txt\u003c/code\u003e\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.miscinit.18.6\u003c/code\u003e — \u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/init/miscinit.c#L868-L880\"\u003e\u003ccode\u003emiscinit.c\u003c/code\u003e\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.backend-startup.18.6\u003c/code\u003e — \u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/tcop/backend_startup.c#L340-L344\"\u003e\u003ccode\u003ebackend_startup.c\u003c/code\u003e\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003edoc.protocol.18\u003c/code\u003e — \u003ca href=\"/docs/18/protocol-error-fields.html\"\u003eError and Notice Message Fields\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003eRuntime: \u003ccode\u003e53300-registry-final-20260909\u003c/code\u003e on latest and pg10; structured observations are in the \u003ca href=\"#sources\"\u003epublic evidence JSON\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e"}],"summary":"53300 is PostgreSQL's toomanyconnections condition in Class 53, insufficient_resources. It is emitted when a new backend cannot be admitted because a connection capacity limit has been reached. The representative case uses a role connection limit of one and opens a second session for that role.","title":"53300 — too_many_connections","translation_source_rev":"9e45ad4cf6901dfd7b944885121ac141da4bce0cf2f2e67174288257b4233541"}},"RequestedLocale":"en","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 probes","source_tag_count":153},"pre9_status":"present","preview_scope":["19beta3"]},"class":"53","class_name":"Insufficient Resources","condition_name":"too_many_connections","condition_names":["too_many_connections"],"definition_changes":[{"evidence_refs":["postgresql:REL9_0_23:src/include/utils/errcodes.h","postgresql:REL9_1_0:src/backend/utils/errcodes.txt"],"first_observed":"9.1.0","from":["Insufficient Resources (PostgreSQL-specific error class)"],"kind":"class_title","notes":"Observed definition change between fixed release snapshots; exact commit introduction may precede the first release tag.","to":["Insufficient Resources"]}],"english_manuals":{"10":{"aliases":[],"class_name":"Insufficient Resources","condition_name":"too_many_connections","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"9607b57e9f639b61785677ba4d226f5889fe1d19c8bf55a3337691899a9073cd","slug":"10"},"lang":"en","sqlstate":"53300"},"11":{"aliases":[],"class_name":"Insufficient Resources","condition_name":"too_many_connections","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"3a024e38263ad77de228eed7930b842b42dc1d5cab9ca3727be8eed872ec9539","slug":"11"},"lang":"en","sqlstate":"53300"},"12":{"aliases":[],"class_name":"Insufficient Resources","condition_name":"too_many_connections","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"1444bd6a138537cd75be88a220ee9472ac528f0cfc58758e49636d85455efe98","slug":"12"},"lang":"en","sqlstate":"53300"},"13":{"aliases":[],"class_name":"Insufficient Resources","condition_name":"too_many_connections","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"4a3ef8af218e5736dfde8660ba609e84233b6b3bac7e0210ff8724cf1b27b2db","slug":"13"},"lang":"en","sqlstate":"53300"},"14":{"aliases":[],"class_name":"Insufficient Resources","condition_name":"too_many_connections","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"1c12e83304e0f4ff64c9d98ca5e3007df6756932ed19867a4fa0e0650f6c5751","slug":"14"},"lang":"en","sqlstate":"53300"},"15":{"aliases":[],"class_name":"Insufficient Resources","condition_name":"too_many_connections","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"2161f58f6e87f6535b3b1f3d4661427bb6765f4f6b074fcc16fac97594b50599","slug":"15"},"lang":"en","sqlstate":"53300"},"16":{"aliases":[],"class_name":"Insufficient 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in a PostgreSQL release definition file is established; runtime throw/use scanning is maintained 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