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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 a database table is accessed. Indexes can be created using one or more columns of a database table, providing the basis for both rapid random lookups and efficient access of ordered records.

Attributes	Values
rdf:type	building
rdfs:label	Database index (en)
rdfs:comment	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 a database table is accessed. Indexes can be created using one or more columns of a database table, providing the basis for both rapid random lookups and efficient access of ordered records. (en)
sameAs	Database index Database index
dbp:wikiPageUsesTemplate	dbt:Main dbt:Reflist dbt:Short_description dbt:Databases
Subject	Database index techniques Databases
gold:hypernym	Structure
prov:wasDerivedFrom	http://en.wikipedia.org/wiki/Database_index?oldid=1064253754&ns=0
Wikipage page ID	1711076 (xsd:integer)
page length (characters) of wiki page	16243 (xsd:nonNegativeInteger)
Wikipage revision ID	1064253754 (xsd:integer)
Link from a Wikipage to another Wikipage	Foreign key Table (database) Unique key B+ tree B-tree Big O notation Bit array Bitwise operation Block (data storage) Self-balancing binary search tree Wildcard character Data structures Database index techniques Databases Search engine indexing Linear search Time complexity Column (database) Composite index (database) Computer file Concurrency control Microsoft SQL Server Partial index SQL Data structure Database Full table scan Index locking Expression (computer science) Hash table Inverted index Sargable Tree (data structure) User-defined function Lookup table Pointer (computer programming) Record (computer science) Relational database
has abstract	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 a database table is accessed. Indexes can be created using one or more columns of a database table, providing the basis for both rapid random lookups and efficient access of ordered records. An index is a copy of selected columns of data, from a table, that is designed to enable very efficient search. An index normally includes a "key" or direct link to the original row of data from which it was copied, to allow the complete row to be retrieved efficiently. Some databases extend the power of indexing by letting developers create indexes on column values that have been transformed by functions or expressions. For example, an index could be created on upper(last_name), which would only store the upper-case versions of the last_name field in the index. Another option sometimes supported is the use of partial indices, where index entries are created only for those records that satisfy some conditional expression. A further aspect of flexibility is to permit indexing on user-defined functions, as well as expressions formed from an assortment of built-in functions. (en)
foaf:isPrimaryTopicOf	http://en.wikipedia.org/wiki/Database_index
is Wikipage redirect of	Non-clustered Index Nonclustered index Database indices Clustered index Table index Sparse index Dense index Index (database) Index file IDX (file format)
is Link from a Wikipage to another Wikipage of	Grid file List of terms relating to algorithms and data structures Log-structured merge-tree Machine-generated data MarkLogic Server NitrosBase ADABAS Access Database Engine Adder (electronics) Adobe ColdFusion Aerospike (database) Algorithmic efficiency Apache Cassandra Apache Pinot Apple Developer Tools Apple Help Viewer Architecture of Btrieve AusStage Australian Music Online B-tree BaseX Binary XML BioSD Biomedical text mining Bitmap index Bitwise trie with bitmap Block Range Index Non-clustered Index Nonclustered index C-squares CUBRID Cache (computing) Cc:Mail Document-oriented database

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