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Database index

A database index is a data structure that improves the speed of data retrieval operations on a database table at the cost of additional writes and storage space to maintain the index data structure. Indexes are used to quickly locate data without having to search every row in a database table every time said table is accessed. Indexes can be created…

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Overview

Usage

Index architecture and indexing methods

Column order

Applications and limitations

Types of indexes

Index implementations

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Map overview Semantic statistics

Database index

Nodes42
Edges41
Triples9
Avg. degree1.95
Density0.047619
Components1

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Database index

Top relations

see also · 3
Database index → Index, Method, Type
is a · 1
Database index → data structure that improves the speed of data retrieval operations on a database table at the cost of additional writes and storage space to maintain the index data structure

Important terminology Word statistics

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Important terminology

index data database table key indexes used one databases name record search records created lookup order indexing row columns clustered

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Database indexis adata structure that improves the speed of data retrieval operations on a database table at the cost of additional writes and storage space to maintain the index data structure0.90text
sequence numbersinstance ofReversing the key value is particularly useful for indexing data0.80text
where new key values monotonically increase.Inverted indexAn inverted index maps a content word to the document containing itinstance ofReversing the key value is particularly useful for indexing data0.80text
thereby allowing full-text searches.Primary indexThe primary index contains the key fields of the tableinstance ofReversing the key value is particularly useful for indexing data0.80text
a pointer to the non-key fields of the tableinstance ofReversing the key value is particularly useful for indexing data0.80text
where new key values monotonically increaseinstance ofReversing the key value is particularly useful for indexing data0.80text
Database indexsee alsoIndex0.60section
Database indexsee alsoType0.60section
Database indexsee alsoMethod0.60section

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