Inverted index

Applications of Inverted Index - Inverted index is a central component of search engine indexing algorithms. - It allows for fast full-text searches. - It optimizes query speed by listing the documents per word. - Inverted index is used in bioinformatics for DNA sequence assembly. - It is used to search for fragments of sequenced DNA against a reference DNA sequence. Compression Techniques for Inverted Index - Inverted list compression and bitmap compression solve the same problem. - Initially developed as separate lines of research. - Both methods are used for compressing inverted indexes. - Compression reduces storage requirements. - Bitmap compression and inverted list compression are related techniques. Related Concepts to Inverted Index - Index (search engine) is related to inverted index. - Reverse index is another type of index. - Vector space model is used in information retrieval. - These concepts are related to inverted index. - They are important in search engine technology. References - Knuth, D. E. (1997) . 'Retrieval on Secondary Keys' in The Art of Computer Programming. - Salton, Gerard; Fox, Edward A.; Wu, Harry (November 1983). 'Extended Boolean information retrieval' in Communications of the ACM. - Zobel, Justin; Moffat, Alistair; Ramamohanarao, Kotagiri (December 1998). 'Inverted files versus signature files for text indexing' in ACM Transactions on Database Systems. - Baeza-Yates, Ricardo; Ribeiro-Neto, Berthier (1999). Modern information retrieval. - Zobel, Justin; Moffat, Alistair (July 2006). 'Inverted Files for Text Search Engines' in ACM Computing Surveys. External Resources - NISTs Dictionary of Algorithms and Data Structures: inverted index. - Managing Gigabytes for Java: a free full-text search engine for large document collections written in Java. - Lucene: a full-featured text search engine library written in Java. - Sphinx Search: an open-source high-performance text search engine library employing an inverted index. - Example implementations on Rosetta Code. - Caltech Large Scale Image Search Toolbox: a Matlab toolbox implementing Inverted File Bag-of-Words image search.