仅索引扫描
已记录的来源状态与原始语言说明；缺少版本证据时明确标为未知。
来源快照记录 PostgreSQL 8.1–18 的变化节点；历史矩阵独立记录 7.4–18 的状态。两者均未记录 PostgreSQL 19 或 20 的支持状态，较新版本明确保留为未知。这些来源声明与运行测量相互独立。
索引和约束
说明
也称为"覆盖索引"，当查询中的所有列都被索引覆盖时，允许直接从索引中获取数据来满足查询。这消除了之前必须访问表页面以获取可见性信息的要求，现在改为使用可见性映射来替代。
所选版本: PostgreSQL 18
不支持
比较版本
原始文档链接
相关来源快照条目 · 此关系来自原始来源；两组矩阵各自保留独立状态。
完整来源事实与出处
legacy · center · cb4c66080e565f5ffc077205ebd67d781b1679b5fa3105c708faba4e5854925f
{
"Key": "217",
"SourceKind": "legacy",
"SourceDatabase": "center",
"SourceTable": "featurematrix_feature",
"SourceKey": "217",
"SourceHash": "cb4c66080e565f5ffc077205ebd67d781b1679b5fa3105c708faba4e5854925f",
"Name": "仅索引扫描",
"NameLocale": "zh-Hans",
"GroupKey": "13",
"GroupName": "索引和约束",
"GroupLocale": "zh-Hans",
"Ordinal": 0,
"GroupOrder": 4,
"Facts": {
"featuredescription": "也称为\"覆盖索引\"，当查询中的所有列都被索引覆盖时，允许直接从索引中获取数据来满足查询。这消除了之前必须访问表页面以获取可见性信息的要求，现在改为使用可见性映射来替代。",
"featurename": "仅索引扫描",
"group_id": 13,
"id": 217,
"v10": 1,
"v11": 1,
"v12": 1,
"v13": 1,
"v14": 0,
"v15": 0,
"v16": 0,
"v17": 0,
"v18": 0,
"v74": 0,
"v80": 0,
"v81": 0,
"v82": 0,
"v83": 0,
"v84": 0,
"v90": 0,
"v91": 0,
"v92": 1,
"v93": 1,
"v94": 1,
"v95": 1,
"v96": 1
},
"Cells": [
{
"Version": "10",
"State": "yes",
"EvidenceKind": "legacy-database:v10",
"TransitionVersion": "",
"Supported": true,
"Original": 1
},
{
"Version": "11",
"State": "yes",
"EvidenceKind": "legacy-database:v11",
"TransitionVersion": "",
"Supported": true,
"Original": 1
},
{
"Version": "12",
"State": "yes",
"EvidenceKind": "legacy-database:v12",
"TransitionVersion": "",
"Supported": true,
"Original": 1
},
{
"Version": "13",
"State": "yes",
"EvidenceKind": "legacy-database:v13",
"TransitionVersion": "",
"Supported": true,
"Original": 1
},
{
"Version": "14",
"State": "no",
"EvidenceKind": "legacy-database:v14",
"TransitionVersion": "",
"Supported": false,
"Original": 0
},
{
"Version": "15",
"State": "no",
"EvidenceKind": "legacy-database:v15",
"TransitionVersion": "",
"Supported": false,
"Original": 0
},
{
"Version": "16",
"State": "no",
"EvidenceKind": "legacy-database:v16",
"TransitionVersion": "",
"Supported": false,
"Original": 0
},
{
"Version": "17",
"State": "no",
"EvidenceKind": "legacy-database:v17",
"TransitionVersion": "",
"Supported": false,
"Original": 0
},
{
"Version": "18",
"State": "no",
"EvidenceKind": "legacy-database:v18",
"TransitionVersion": "",
"Supported": false,
"Original": 0
},
{
"Version": "7.4",
"State": "no",
"EvidenceKind": "legacy-database:v74",
"TransitionVersion": "",
"Supported": false,
"Original": 0
},
{
"Version": "8.0",
"State": "no",
"EvidenceKind": "legacy-database:v80",
"TransitionVersion": "",
"Supported": false,
"Original": 0
},
{
"Version": "8.1",
"State": "no",
"EvidenceKind": "legacy-database:v81",
"TransitionVersion": "",
"Supported": false,
"Original": 0
},
{
"Version": "8.2",
"State": "no",
"EvidenceKind": "legacy-database:v82",
"TransitionVersion": "",
"Supported": false,
"Original": 0
},
{
"Version": "8.3",
"State": "no",
"EvidenceKind": "legacy-database:v83",
"TransitionVersion": "",
"Supported": false,
"Original": 0
},
{
"Version": "8.4",
"State": "no",
"EvidenceKind": "legacy-database:v84",
"TransitionVersion": "",
"Supported": false,
"Original": 0
},
{
"Version": "9.0",
"State": "no",
"EvidenceKind": "legacy-database:v90",
"TransitionVersion": "",
"Supported": false,
"Original": 0
},
{
"Version": "9.1",
"State": "no",
"EvidenceKind": "legacy-database:v91",
"TransitionVersion": "",
"Supported": false,
"Original": 0
},
{
"Version": "9.2",
"State": "yes",
"EvidenceKind": "legacy-database:v92",
"TransitionVersion": "",
"Supported": true,
"Original": 1
},
{
"Version": "9.3",
"State": "yes",
"EvidenceKind": "legacy-database:v93",
"TransitionVersion": "",
"Supported": true,
"Original": 1
},
{
"Version": "9.4",
"State": "yes",
"EvidenceKind": "legacy-database:v94",
"TransitionVersion": "",
"Supported": true,
"Original": 1
},
{
"Version": "9.5",
"State": "yes",
"EvidenceKind": "legacy-database:v95",
"TransitionVersion": "",
"Supported": true,
"Original": 1
},
{
"Version": "9.6",
"State": "yes",
"EvidenceKind": "legacy-database:v96",
"TransitionVersion": "",
"Supported": true,
"Original": 1
}
],
"Texts": [
{
"Locale": "zh-Hans",
"Title": "仅索引扫描",
"BodyHTML": "\u003cp\u003e也称为\u0026#34;覆盖索引\u0026#34;，当查询中的所有列都被索引覆盖时，允许直接从索引中获取数据来满足查询。这消除了之前必须访问表页面以获取可见性信息的要求，现在改为使用可见性映射来替代。\u003c/p\u003e\n",
"SourceHash": "cb4c66080e565f5ffc077205ebd67d781b1679b5fa3105c708faba4e5854925f",
"ContentHash": "a672d62ead0fa8266d117136b755697024813a643716aa603fd0ee97e4d09d60",
"Payload": {
"description": "也称为\"覆盖索引\"，当查询中的所有列都被索引覆盖时，允许直接从索引中获取数据来满足查询。这消除了之前必须访问表页面以获取可见性信息的要求，现在改为使用可见性映射来替代。",
"name": "仅索引扫描"
}
}
],
"GroupTitles": {
"zh-Hans": "索引和约束"
},
"RelatedKey": "index-only-scans"
}