Equivalence properties of semantic data models for database systems:
A data model defines the types of structures present in a database and the types of operations which may be used to alter the database. An understanding of data model equivalence properties is necessary if one wishes to implement a system which presents different uses with views of a database in ter...
Gespeichert in:
| 1. Verfasser: | |
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| Format: | Abschlussarbeit Buch |
| Sprache: | English |
| Veröffentlicht: |
Cambridge, Mass.
Mass. Inst. of Technology, Laboratory for Computer Science
1979
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| Schlagworte: | |
| Zusammenfassung: | A data model defines the types of structures present in a database and the types of operations which may be used to alter the database. An understanding of data model equivalence properties is necessary if one wishes to implement a system which presents different uses with views of a database in terms of differing data models or which provides a common interface to several database systems defined in terms of different data models. Requisites for this understanding are formal definitions of the involved concepts and a formal framework in which different data models can be compared. This thesis presents formal definitions of the terms database, operation, operation type, application model. Database state equivalence, operation equivalence, application model equivalence and data model equivalence are distinguished. Three types of application and data model equivalence are defined - isomorphic, composed operation and state dependent. Implementation implications of these different equivalences are discussed. It is proved that the semantic graph and the restricted semantic relation data models are state dependent equivalent. Observations on the network vs. relational data model 'controversy' are presented. SUggestions for applications of this research include a dual semantic data model interface. |
| Beschreibung: | 311 S. |
Internformat
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| 245 | 1 | 0 | |a Equivalence properties of semantic data models for database systems |
| 264 | 1 | |a Cambridge, Mass. |b Mass. Inst. of Technology, Laboratory for Computer Science |c 1979 | |
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| 520 | 3 | |a A data model defines the types of structures present in a database and the types of operations which may be used to alter the database. An understanding of data model equivalence properties is necessary if one wishes to implement a system which presents different uses with views of a database in terms of differing data models or which provides a common interface to several database systems defined in terms of different data models. Requisites for this understanding are formal definitions of the involved concepts and a formal framework in which different data models can be compared. This thesis presents formal definitions of the terms database, operation, operation type, application model. Database state equivalence, operation equivalence, application model equivalence and data model equivalence are distinguished. Three types of application and data model equivalence are defined - isomorphic, composed operation and state dependent. Implementation implications of these different equivalences are discussed. It is proved that the semantic graph and the restricted semantic relation data models are state dependent equivalent. Observations on the network vs. relational data model 'controversy' are presented. SUggestions for applications of this research include a dual semantic data model interface. | |
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Datensatz im Suchindex
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| illustrated | Not Illustrated |
| index_date | 2024-07-02T16:03:35Z |
| indexdate | 2024-07-09T20:46:30Z |
| institution | BVB |
| language | English |
| oai_aleph_id | oai:aleph.bib-bvb.de:BVB01-015091507 |
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| publishDate | 1979 |
| publishDateSearch | 1979 |
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| publisher | Mass. Inst. of Technology, Laboratory for Computer Science |
| record_format | marc |
| spelling | Borkin, Sheldon A. Verfasser aut Equivalence properties of semantic data models for database systems Cambridge, Mass. Mass. Inst. of Technology, Laboratory for Computer Science 1979 311 S. txt rdacontent n rdamedia nc rdacarrier Zugl.: Diss. A data model defines the types of structures present in a database and the types of operations which may be used to alter the database. An understanding of data model equivalence properties is necessary if one wishes to implement a system which presents different uses with views of a database in terms of differing data models or which provides a common interface to several database systems defined in terms of different data models. Requisites for this understanding are formal definitions of the involved concepts and a formal framework in which different data models can be compared. This thesis presents formal definitions of the terms database, operation, operation type, application model. Database state equivalence, operation equivalence, application model equivalence and data model equivalence are distinguished. Three types of application and data model equivalence are defined - isomorphic, composed operation and state dependent. Implementation implications of these different equivalences are discussed. It is proved that the semantic graph and the restricted semantic relation data models are state dependent equivalent. Observations on the network vs. relational data model 'controversy' are presented. SUggestions for applications of this research include a dual semantic data model interface. Computer Hardware scgdst Computer architecture dtict Computer graphics dtict Data bases dtict Data storage systems dtict Information Science scgdst Information systems dtict Linguistics scgdst Models dtict Semantics dtict Systems analysis dtict Theses dtict Linguistik Semantisches Datenmodell (DE-588)4314515-2 gnd rswk-swf Datenbanksystem (DE-588)4113276-2 gnd rswk-swf (DE-588)4113937-9 Hochschulschrift gnd-content Datenbanksystem (DE-588)4113276-2 s Semantisches Datenmodell (DE-588)4314515-2 s DE-604 |
| spellingShingle | Borkin, Sheldon A. Equivalence properties of semantic data models for database systems Computer Hardware scgdst Computer architecture dtict Computer graphics dtict Data bases dtict Data storage systems dtict Information Science scgdst Information systems dtict Linguistics scgdst Models dtict Semantics dtict Systems analysis dtict Theses dtict Linguistik Semantisches Datenmodell (DE-588)4314515-2 gnd Datenbanksystem (DE-588)4113276-2 gnd |
| subject_GND | (DE-588)4314515-2 (DE-588)4113276-2 (DE-588)4113937-9 |
| title | Equivalence properties of semantic data models for database systems |
| title_auth | Equivalence properties of semantic data models for database systems |
| title_exact_search | Equivalence properties of semantic data models for database systems |
| title_exact_search_txtP | Equivalence properties of semantic data models for database systems |
| title_full | Equivalence properties of semantic data models for database systems |
| title_fullStr | Equivalence properties of semantic data models for database systems |
| title_full_unstemmed | Equivalence properties of semantic data models for database systems |
| title_short | Equivalence properties of semantic data models for database systems |
| title_sort | equivalence properties of semantic data models for database systems |
| topic | Computer Hardware scgdst Computer architecture dtict Computer graphics dtict Data bases dtict Data storage systems dtict Information Science scgdst Information systems dtict Linguistics scgdst Models dtict Semantics dtict Systems analysis dtict Theses dtict Linguistik Semantisches Datenmodell (DE-588)4314515-2 gnd Datenbanksystem (DE-588)4113276-2 gnd |
| topic_facet | Computer Hardware Computer architecture Computer graphics Data bases Data storage systems Information Science Information systems Linguistics Models Semantics Systems analysis Theses Linguistik Semantisches Datenmodell Datenbanksystem Hochschulschrift |
| work_keys_str_mv | AT borkinsheldona equivalencepropertiesofsemanticdatamodelsfordatabasesystems |