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Database model
Common models
Hierarchical Network Relational Object-relational Object Other modelsAssociative Concept-oriented Multi-dimensional Star schema XML database The network model is a database model conceived as a flexible way of representing objects and their relationships. Its original inventor was Charles Bachman, and it was developed into a standard specification published in 1969 by the CODASYL Consortium. Where the hierarchical model structures data as a tree of records, with each record having one parent record and many children, the network model allows each record to have multiple parent and child records, forming a lattice structure. The chief argument in favour of the network model, in comparison to the hierarchic model, was that it allowed a more natural modeling of relationships between entities. Although the model was widely implemented and used, it failed to become dominant for two main reasons. Firstly, IBM chose to stick to the hierarchical model with semi-network extensions in their established products such as IMS and DL/I. Secondly, it was eventually displaced by the relational model, which offered a higher-level, more declarative interface. Until the early 1980s the performance benefits of the low-level navigational interfaces offered by hierarchical and network databases were persuasive for many large-scale applications, but as hardware became faster, the extra productivity and flexibility of the relational model led to the gradual obsolescence of the network model in corporate enterprise usage. Blogs pvc blinds Wholesale Omega_DeVille_Prestige_Steel_Ladies_Watch_4570.33 Wholesale Michele_CSX_Blue_Diamond_Steel_Burgundy_Ladies_Watch_MWW03E000058 Learning at CA Video: Van Jacobsen describes new way to look at networking, from a data centric perspective Fujitsu ScanSnap S510 Instant PDF Sheet-Fed Scanner Gizmodo EVENT BRIEF OF SUNRISE SENIOR LIVING CONFERENCE CALL THE TAO OF TV: MTV’s Rock the Cradle and the Return of the Office
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