Vacuum "emergency mode"
Recorded source states and original language descriptions. Missing version evidence stays unknown.
The source snapshot records transitions for PostgreSQL 8.1–18. The historical matrix records independent cells for 7.4–18. Neither records support for PostgreSQL 19 or 20; newer versions remain unknown. These source claims are distinct from runtime measurements.
VACUUM and Maintenance
Description
PostgreSQL will vacuum aggressively when it detects the possibility of transaction ID wraparound. This is controlled with the vacuum_failsafe_age and vacuum_multixact_failsafe_age configuration parameters.
Selected version: PostgreSQL 18
Yes
Compare versions
Original documentation links
Recorded legacy identifiers: 360
Complete source facts and provenance
yaml · center · 1dd22bf9a7f3ec325b894e2836fda535a25529f246a94dd41d6abbfe9997f7fd
{
"Key": "vacuum-emergency-mode",
"SourceKind": "yaml",
"SourceDatabase": "center",
"SourceTable": "featurematrix.yaml",
"SourceKey": "Vacuum \"emergency mode\"",
"SourceHash": "1dd22bf9a7f3ec325b894e2836fda535a25529f246a94dd41d6abbfe9997f7fd",
"Name": "Vacuum \"emergency mode\"",
"NameLocale": "en",
"GroupKey": "vacuum-and-maintenance",
"GroupName": "VACUUM and Maintenance",
"GroupLocale": "en",
"Ordinal": 6,
"GroupOrder": 16,
"Facts": {
"feature": {
"description": "PostgreSQL will vacuum aggressively when it detects the possibility of transaction ID wraparound. This is controlled with the [`vacuum_failsafe_age `](https://www.postgresql.org/docs/14/runtime-config-client.html#GUC-VACUUM-FAILSAFE-AGE) and [`vacuum_multixact_failsafe_age `](https://www.postgresql.org/docs/14/runtime-config-client.html#GUC-MULTIXACT-FAILSAFE-AGE) configuration parameters.",
"name": "Vacuum \"emergency mode\"",
"versions": {
"14": "Yes"
}
},
"group": "VACUUM and Maintenance",
"versions": {
"max": 18,
"min": 8.1
}
},
"Cells": [
{
"Version": "10",
"State": "no",
"EvidenceKind": "yaml-default-no",
"TransitionVersion": "",
"Supported": false,
"Original": "No"
},
{
"Version": "11",
"State": "no",
"EvidenceKind": "yaml-default-no",
"TransitionVersion": "",
"Supported": false,
"Original": "No"
},
{
"Version": "12",
"State": "no",
"EvidenceKind": "yaml-default-no",
"TransitionVersion": "",
"Supported": false,
"Original": "No"
},
{
"Version": "13",
"State": "no",
"EvidenceKind": "yaml-default-no",
"TransitionVersion": "",
"Supported": false,
"Original": "No"
},
{
"Version": "14",
"State": "yes",
"EvidenceKind": "yaml-transition",
"TransitionVersion": "14",
"Supported": true,
"Original": "Yes"
},
{
"Version": "15",
"State": "yes",
"EvidenceKind": "yaml-transition",
"TransitionVersion": "14",
"Supported": true,
"Original": "Yes"
},
{
"Version": "16",
"State": "yes",
"EvidenceKind": "yaml-transition",
"TransitionVersion": "14",
"Supported": true,
"Original": "Yes"
},
{
"Version": "17",
"State": "yes",
"EvidenceKind": "yaml-transition",
"TransitionVersion": "14",
"Supported": true,
"Original": "Yes"
},
{
"Version": "18",
"State": "yes",
"EvidenceKind": "yaml-transition",
"TransitionVersion": "14",
"Supported": true,
"Original": "Yes"
},
{
"Version": "8.1",
"State": "no",
"EvidenceKind": "yaml-default-no",
"TransitionVersion": "",
"Supported": false,
"Original": "No"
},
{
"Version": "8.2",
"State": "no",
"EvidenceKind": "yaml-default-no",
"TransitionVersion": "",
"Supported": false,
"Original": "No"
},
{
"Version": "8.3",
"State": "no",
"EvidenceKind": "yaml-default-no",
"TransitionVersion": "",
"Supported": false,
"Original": "No"
},
{
"Version": "8.4",
"State": "no",
"EvidenceKind": "yaml-default-no",
"TransitionVersion": "",
"Supported": false,
"Original": "No"
},
{
"Version": "9.0",
"State": "no",
"EvidenceKind": "yaml-default-no",
"TransitionVersion": "",
"Supported": false,
"Original": "No"
},
{
"Version": "9.1",
"State": "no",
"EvidenceKind": "yaml-default-no",
"TransitionVersion": "",
"Supported": false,
"Original": "No"
},
{
"Version": "9.2",
"State": "no",
"EvidenceKind": "yaml-default-no",
"TransitionVersion": "",
"Supported": false,
"Original": "No"
},
{
"Version": "9.3",
"State": "no",
"EvidenceKind": "yaml-default-no",
"TransitionVersion": "",
"Supported": false,
"Original": "No"
},
{
"Version": "9.4",
"State": "no",
"EvidenceKind": "yaml-default-no",
"TransitionVersion": "",
"Supported": false,
"Original": "No"
},
{
"Version": "9.5",
"State": "no",
"EvidenceKind": "yaml-default-no",
"TransitionVersion": "",
"Supported": false,
"Original": "No"
},
{
"Version": "9.6",
"State": "no",
"EvidenceKind": "yaml-default-no",
"TransitionVersion": "",
"Supported": false,
"Original": "No"
}
],
"Texts": [
{
"Locale": "en",
"Title": "Vacuum \"emergency mode\"",
"BodyHTML": "\u003cp\u003ePostgreSQL will vacuum aggressively when it detects the possibility of transaction ID wraparound. This is controlled with the \u003ca href=\"https://www.postgresql.org/docs/14/runtime-config-client.html#GUC-VACUUM-FAILSAFE-AGE\" rel=\"nofollow\"\u003e\u003ccode\u003evacuum_failsafe_age \u003c/code\u003e\u003c/a\u003e and \u003ca href=\"https://www.postgresql.org/docs/14/runtime-config-client.html#GUC-MULTIXACT-FAILSAFE-AGE\" rel=\"nofollow\"\u003e\u003ccode\u003evacuum_multixact_failsafe_age \u003c/code\u003e\u003c/a\u003e configuration parameters.\u003c/p\u003e\n",
"SourceHash": "1dd22bf9a7f3ec325b894e2836fda535a25529f246a94dd41d6abbfe9997f7fd",
"ContentHash": "edbaae8cdef785f62fcc4dd224f65634d7104566c000233bdd7a22118b170ba6",
"Payload": {
"description": "PostgreSQL will vacuum aggressively when it detects the possibility of transaction ID wraparound. This is controlled with the [`vacuum_failsafe_age `](https://www.postgresql.org/docs/14/runtime-config-client.html#GUC-VACUUM-FAILSAFE-AGE) and [`vacuum_multixact_failsafe_age `](https://www.postgresql.org/docs/14/runtime-config-client.html#GUC-MULTIXACT-FAILSAFE-AGE) configuration parameters.",
"name": "Vacuum \"emergency mode\"",
"versions": {
"14": "Yes"
}
}
},
{
"Locale": "zh-Hans",
"Title": "Vacuum “紧急模式”",
"BodyHTML": "\u003cp\u003e当 PostgreSQL 检测到事务 ID 回卷风险时，会更激进地执行 vacuum；该行为由 \u003ccode\u003evacuum_failsafe_age\u003c/code\u003e 控制。\u003c/p\u003e\n",
"SourceHash": "071091951021357a5f492adb04caed6febf4d315ac2626ca027a48dd8ec01d50",
"ContentHash": "611970aff395160b0ff3621d0ce3c61a9a8da5bbfe8867e9ad89d4cc95134064",
"Payload": {
"description": "当 PostgreSQL 检测到事务 ID 回卷风险时，会更激进地执行 vacuum；该行为由 `vacuum_failsafe_age` 控制。",
"name": "Vacuum “紧急模式”"
}
}
],
"GroupTitles": {
"en": "VACUUM and Maintenance",
"zh-Hans": "VACUUM 与维护"
},
"LegacyIDs": [
"360"
]
}