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- Bitmap_index abstract "A bitmap index is a special kind of database index that uses bitmaps.Bitmap indexes have traditionally been considered to work well for low-cardinality columns, which have a modest number of distinct values, either absolutely, or relative to the number of records that contain the data. The extreme case of low cardinality is Boolean data (e.g., does a resident in a city have internet access?), which has two values, True and False. Bitmap indexes use bit arrays (commonly called bitmaps) and answer queries by performing bitwise logical operations on these bitmaps. Bitmap indexes have a significant space and performance advantage over other structures for query of such data. Their drawback is they are less efficient than the traditional B-tree indexes for columns whose data is frequently updated: consequently, they are more often employed in read-only systems that are specialized for fast query - e.g., data warehouses, and generally unsuitable for online transaction processing applications.Some researchers argue that bitmap indexes are also useful for moderate or even high-cardinality data (e.g., unique-valued data) which is accessed in a read-only manner, and queries access multiple bitmap-indexed columns using the AND, OR or XOR operators extensively.Bitmap indexes are also useful in data warehousing applications for joining a large fact table to smaller dimension tables such as those arranged in a star schema.Bitmap based representation can also be used for representing a data structure which is labeled and directed attributed multigraph, used for queries in graph databases.Efficient graph management based on bitmap indices article shows how bitmap index representation can be used to manage large dataset(billions of data points) and answer queries related to graph efficiently.".
- Bitmap_index wikiPageID "2017214".
- Bitmap_index wikiPageLength "20308".
- Bitmap_index wikiPageOutDegree "42".
- Bitmap_index wikiPageRevisionID "705212027".
- Bitmap_index wikiPageWikiLink Apache_Hive.
- Bitmap_index wikiPageWikiLink B+_tree.
- Bitmap_index wikiPageWikiLink B-tree.
- Bitmap_index wikiPageWikiLink Bit.
- Bitmap_index wikiPageWikiLink Bit_array.
- Bitmap_index wikiPageWikiLink Bitwise_operation.
- Bitmap_index wikiPageWikiLink Byte.
- Bitmap_index wikiPageWikiLink Category:Bit_data_structures.
- Bitmap_index wikiPageWikiLink Category:Data_management.
- Bitmap_index wikiPageWikiLink Category:Database_index_techniques.
- Bitmap_index wikiPageWikiLink Central_processing_unit.
- Bitmap_index wikiPageWikiLink Data_compression.
- Bitmap_index wikiPageWikiLink Data_warehouse.
- Bitmap_index wikiPageWikiLink Database.
- Bitmap_index wikiPageWikiLink Database_index.
- Bitmap_index wikiPageWikiLink Dimension_table.
- Bitmap_index wikiPageWikiLink Fact_table.
- Bitmap_index wikiPageWikiLink Graph_database.
- Bitmap_index wikiPageWikiLink Identifier.
- Bitmap_index wikiPageWikiLink International_Journal_of_Computers_and_Communications.
- Bitmap_index wikiPageWikiLink LZ77_and_LZ78.
- Bitmap_index wikiPageWikiLink Locality_of_reference.
- Bitmap_index wikiPageWikiLink Logical_connective.
- Bitmap_index wikiPageWikiLink LucidDB.
- Bitmap_index wikiPageWikiLink Materialized_view.
- Bitmap_index wikiPageWikiLink Mebibyte.
- Bitmap_index wikiPageWikiLink Model_204.
- Bitmap_index wikiPageWikiLink Morgan_Kaufmann_Publishers.
- Bitmap_index wikiPageWikiLink Online_transaction_processing.
- Bitmap_index wikiPageWikiLink Patrick_ONeil.
- Bitmap_index wikiPageWikiLink PostgreSQL.
- Bitmap_index wikiPageWikiLink Run-length_encoding.
- Bitmap_index wikiPageWikiLink San_Francisco.
- Bitmap_index wikiPageWikiLink Southampton.
- Bitmap_index wikiPageWikiLink Star_schema.
- Bitmap_index wikiPageWikiLink University_of_Southampton.
- Bitmap_index wikiPageWikiLinkText "Bitmap index (compression)".
- Bitmap_index wikiPageWikiLinkText "Bitmap index".
- Bitmap_index wikiPageWikiLinkText "Bitmap".
- Bitmap_index wikiPageWikiLinkText "bitmap index".
- Bitmap_index wikiPageWikiLinkText "bitmap indices".
- Bitmap_index wikiPageWikiLinkText "bitmaps".
- Bitmap_index wikiPageUsesTemplate Template:Cite_journal.
- Bitmap_index wikiPageUsesTemplate Template:Clear.
- Bitmap_index wikiPageUsesTemplate Template:Inconsistent_citations.
- Bitmap_index wikiPageUsesTemplate Template:Reflist.
- Bitmap_index subject Category:Bit_data_structures.
- Bitmap_index subject Category:Data_management.
- Bitmap_index subject Category:Database_index_techniques.
- Bitmap_index hypernym Kind.
- Bitmap_index type Datum.
- Bitmap_index type Redirect.
- Bitmap_index type Structure.
- Bitmap_index type Technique.
- Bitmap_index comment "A bitmap index is a special kind of database index that uses bitmaps.Bitmap indexes have traditionally been considered to work well for low-cardinality columns, which have a modest number of distinct values, either absolutely, or relative to the number of records that contain the data. The extreme case of low cardinality is Boolean data (e.g., does a resident in a city have internet access?), which has two values, True and False.".
- Bitmap_index label "Bitmap index".
- Bitmap_index sameAs Q878825.
- Bitmap_index sameAs Bitmapové_indexování.
- Bitmap_index sameAs Bitmap-Index.
- Bitmap_index sameAs m.06fcr7.
- Bitmap_index sameAs Q878825.
- Bitmap_index wasDerivedFrom Bitmap_index?oldid=705212027.
- Bitmap_index isPrimaryTopicOf Bitmap_index.