Index-only scans
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.
Indexing & Constraints
Description
Also known as "covering indexes", allows data in indexes to satisfy queries where all columns in a given query are covered by the index. This removes the requirement of having to visit the table pages, which was required previously to get visibility information, but now the visibility map is used instead.
Selected version: PostgreSQL 18
Yes
Compare versions
Original documentation links
Recorded legacy identifiers: 217
Complete source facts and provenance
yaml · center · 1dd22bf9a7f3ec325b894e2836fda535a25529f246a94dd41d6abbfe9997f7fd
{
"Key": "index-only-scans",
"SourceKind": "yaml",
"SourceDatabase": "center",
"SourceTable": "featurematrix.yaml",
"SourceKey": "Index-only scans",
"SourceHash": "1dd22bf9a7f3ec325b894e2836fda535a25529f246a94dd41d6abbfe9997f7fd",
"Name": "Index-only scans",
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"GroupKey": "indexing-constraints",
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"Ordinal": 13,
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"Facts": {
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"description": "Also known as \"covering indexes\", allows data in indexes to satisfy queries where all columns in a given query are covered by the index. This removes the requirement of having to visit the table pages, which was required previously to get visibility information, but now the visibility map is used instead.",
"name": "Index-only scans",
"versions": {
"9.2": "Yes"
}
},
"group": "Indexing \u0026 Constraints",
"versions": {
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"min": 8.1
}
},
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{
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"Original": "Yes"
},
{
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{
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},
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},
{
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{
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},
{
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},
{
"Version": "8.4",
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{
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},
{
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{
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},
{
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},
{
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},
{
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},
{
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}
],
"Texts": [
{
"Locale": "en",
"Title": "Index-only scans",
"BodyHTML": "\u003cp\u003eAlso known as \u0026#34;covering indexes\u0026#34;, allows data in indexes to satisfy queries where all columns in a given query are covered by the index. This removes the requirement of having to visit the table pages, which was required previously to get visibility information, but now the visibility map is used instead.\u003c/p\u003e\n",
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"name": "Index-only scans",
"versions": {
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}
}
},
{
"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",
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"name": "仅索引扫描"
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],
"GroupTitles": {
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"zh-Hans": "索引和约束"
},
"LegacyIDs": [
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]
}