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- Database_index 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 the use of more storage space to maintain the extra copy of data. 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 select columns of data from a table that can be searched very efficiently that also includes a low level disk block address or direct link to the complete row of data it was copied from. Some databases extend the power of indexing by allowing indices to be created on 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 "filtered" 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.".
- Database_index wikiPageID "1711076".
- Database_index wikiPageRevisionID "606273857".
- Database_index hasPhotoCollection Database_index.
- Database_index subject Category:Database_index_techniques.
- Database_index subject Category:Databases.
- Database_index type Ability105616246.
- Database_index type Abstraction100002137.
- Database_index type Cognition100023271.
- Database_index type DatabaseIndexTechniques.
- Database_index type Know-how105616786.
- Database_index type Method105660268.
- Database_index type PsychologicalFeature100023100.
- Database_index type Technique105665146.
- Database_index 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 the use of more storage space to maintain the extra copy of data. Indexes are used to quickly locate data without having to search every row in a database table every time a database table is accessed.".
- Database_index label "Database index".
- Database_index label "Datenbankindex".
- Database_index label "Indeksowanie".
- Database_index label "Index (base de données)".
- Database_index label "Index (database)".
- Database_index label "Indice (basi di dati)".
- Database_index label "Índice (base de datos)".
- Database_index label "Índice (estruturas de dados)".
- Database_index label "Индекс (базы данных)".
- Database_index label "فهرس قاعدة بيانات".
- Database_index label "数据库索引".
- Database_index label "索引 (データベース)".
- Database_index sameAs Index_(databáze).
- Database_index sameAs Datenbankindex.
- Database_index sameAs Índice_(base_de_datos).
- Database_index sameAs Index_(base_de_données).
- Database_index sameAs Indice_(basi_di_dati).
- Database_index sameAs 索引_(データベース).
- Database_index sameAs 인덱스_(데이터베이스).
- Database_index sameAs Index_(database).
- Database_index sameAs Indeksowanie.
- Database_index sameAs Índice_(estruturas_de_dados).
- Database_index sameAs m.05q990.
- Database_index sameAs Q580427.
- Database_index sameAs Q580427.
- Database_index sameAs Database_index.
- Database_index wasDerivedFrom Database_index?oldid=606273857.
- Database_index isPrimaryTopicOf Database_index.