Disk based FSM
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.
Backend
Description
replaces the shared memory fixed size free space map with an on-disk implemenation
Selected version: PostgreSQL 18
Yes
Compare versions
Original documentation links
Recorded legacy identifiers: 140
Complete source facts and provenance
yaml · center · 1dd22bf9a7f3ec325b894e2836fda535a25529f246a94dd41d6abbfe9997f7fd
{
"Key": "disk-based-fsm",
"SourceKind": "yaml",
"SourceDatabase": "center",
"SourceTable": "featurematrix.yaml",
"SourceKey": "Disk based FSM",
"SourceHash": "1dd22bf9a7f3ec325b894e2836fda535a25529f246a94dd41d6abbfe9997f7fd",
"Name": "Disk based FSM",
"NameLocale": "en",
"GroupKey": "backend",
"GroupName": "Backend",
"GroupLocale": "en",
"Ordinal": 3,
"GroupOrder": 0,
"Facts": {
"feature": {
"description": "replaces the shared memory fixed size free space map with an on-disk implemenation",
"name": "Disk based FSM",
"versions": {
"8.4": "Yes"
}
},
"group": "Backend",
"versions": {
"max": 18,
"min": 8.1
}
},
"Cells": [
{
"Version": "10",
"State": "yes",
"EvidenceKind": "yaml-transition",
"TransitionVersion": "8.4",
"Supported": true,
"Original": "Yes"
},
{
"Version": "11",
"State": "yes",
"EvidenceKind": "yaml-transition",
"TransitionVersion": "8.4",
"Supported": true,
"Original": "Yes"
},
{
"Version": "12",
"State": "yes",
"EvidenceKind": "yaml-transition",
"TransitionVersion": "8.4",
"Supported": true,
"Original": "Yes"
},
{
"Version": "13",
"State": "yes",
"EvidenceKind": "yaml-transition",
"TransitionVersion": "8.4",
"Supported": true,
"Original": "Yes"
},
{
"Version": "14",
"State": "yes",
"EvidenceKind": "yaml-transition",
"TransitionVersion": "8.4",
"Supported": true,
"Original": "Yes"
},
{
"Version": "15",
"State": "yes",
"EvidenceKind": "yaml-transition",
"TransitionVersion": "8.4",
"Supported": true,
"Original": "Yes"
},
{
"Version": "16",
"State": "yes",
"EvidenceKind": "yaml-transition",
"TransitionVersion": "8.4",
"Supported": true,
"Original": "Yes"
},
{
"Version": "17",
"State": "yes",
"EvidenceKind": "yaml-transition",
"TransitionVersion": "8.4",
"Supported": true,
"Original": "Yes"
},
{
"Version": "18",
"State": "yes",
"EvidenceKind": "yaml-transition",
"TransitionVersion": "8.4",
"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": "yes",
"EvidenceKind": "yaml-transition",
"TransitionVersion": "8.4",
"Supported": true,
"Original": "Yes"
},
{
"Version": "9.0",
"State": "yes",
"EvidenceKind": "yaml-transition",
"TransitionVersion": "8.4",
"Supported": true,
"Original": "Yes"
},
{
"Version": "9.1",
"State": "yes",
"EvidenceKind": "yaml-transition",
"TransitionVersion": "8.4",
"Supported": true,
"Original": "Yes"
},
{
"Version": "9.2",
"State": "yes",
"EvidenceKind": "yaml-transition",
"TransitionVersion": "8.4",
"Supported": true,
"Original": "Yes"
},
{
"Version": "9.3",
"State": "yes",
"EvidenceKind": "yaml-transition",
"TransitionVersion": "8.4",
"Supported": true,
"Original": "Yes"
},
{
"Version": "9.4",
"State": "yes",
"EvidenceKind": "yaml-transition",
"TransitionVersion": "8.4",
"Supported": true,
"Original": "Yes"
},
{
"Version": "9.5",
"State": "yes",
"EvidenceKind": "yaml-transition",
"TransitionVersion": "8.4",
"Supported": true,
"Original": "Yes"
},
{
"Version": "9.6",
"State": "yes",
"EvidenceKind": "yaml-transition",
"TransitionVersion": "8.4",
"Supported": true,
"Original": "Yes"
}
],
"Texts": [
{
"Locale": "en",
"Title": "Disk based FSM",
"BodyHTML": "\u003cp\u003ereplaces the shared memory fixed size free space map with an on-disk implemenation\u003c/p\u003e\n",
"SourceHash": "1dd22bf9a7f3ec325b894e2836fda535a25529f246a94dd41d6abbfe9997f7fd",
"ContentHash": "f5cc41d681d738647a9af28be3060039d06e85ab447baecae527de61aa181d42",
"Payload": {
"description": "replaces the shared memory fixed size free space map with an on-disk implemenation",
"name": "Disk based FSM",
"versions": {
"8.4": "Yes"
}
}
},
{
"Locale": "zh-Hans",
"Title": "基于磁盘的 FSM",
"BodyHTML": "\u003cp\u003e用基于磁盘的实现替换了共享内存中固定大小的空闲空间映射\u003c/p\u003e\n",
"SourceHash": "071091951021357a5f492adb04caed6febf4d315ac2626ca027a48dd8ec01d50",
"ContentHash": "bc719930b136d3a84a1b59a14a43783d048fb2e09e147214a197736e6b74ed74",
"Payload": {
"description": "用基于磁盘的实现替换了共享内存中固定大小的空闲空间映射",
"name": "基于磁盘的 FSM"
}
}
],
"GroupTitles": {
"en": "Backend",
"zh-Hans": "后端"
},
"LegacyIDs": [
"140"
]
}