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Concurrency control mechanisms for multidatabase systems
Thesis (M. Sc.) -- University of Stellenbosch, 1991.
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| Format: | Thesis |
| Language: | English |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867613781227470850 |
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| access_status_str | Open Access |
| author | Deacon, Andrew Edwin |
| author2 | Rennhackkamp, Martin H. |
| author_browse | Deacon, Andrew Edwin Rennhackkamp, Martin H. |
| author_facet | Rennhackkamp, Martin H. Deacon, Andrew Edwin |
| author_sort | Deacon, Andrew Edwin |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (M. Sc.) -- University of Stellenbosch, 1991. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/69128 |
| institution | Stellenbosch University (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:41:35.993Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/69128 Concurrency control mechanisms for multidatabase systems Deacon, Andrew Edwin Rennhackkamp, Martin H. Stellenbosch University. Faculty of Science. Dept. of Computer Science. Database management Database design Dissertations -- Computer science Thesis (M. Sc.) -- University of Stellenbosch, 1991. A Multidatabase System (MDBS) is a type of ditributed database system that is built up from a collection of different centralized Database Systems (DBSs) located on sites in a computer network. The MDBS design goal is to create a system that enables users easily to access the data stored in the different component DBSs while still permitting them to remain autonomous. Our focus is on the concurrency control issues in such a system. The conventional concurrency control correctedness criterion for DBSs is serializability. That is the execution of all transactions must be equivalent to a serial execution of the same transactions. In many MDBSs the concurrency control mechanisms developed for more conventional distributed DBSs have been used. However, this requires restrictive assumptions to be made about the capabilities of component DBSs that have been regarded as a violation of autonomy. Enforcing serializability is more difficult without these assumptions. The problem is that the MDBS is not aware of all operations executing on the shared database. To enable DBSs to remain autonomous they must be able to continue to execute operations independent of the MDBS on the shared databases. It has been difficult to relate many of the proposed solutionos with conventional concurrency control theory. Using multi-level nested transaction concepts we have been able to recast many of these mechanisms into a single framework. There are also questions about whether MDBSs should enforce serializability since in many applications this is an unnecessary restriction. The approach that has been followed is to use application knowledge to enforce application specific correctness criteria that will permit more concurrency. Many of the proposed solutions have also fitted into the nested transaction paradigm. Our work will aid in the better understanding and selection of appropriate mechanisms for MDBSs and serve as a basis for future research. Masters 2012-08-27T12:26:56Z 2012-08-27T12:26:56Z 1991 Thesis http://hdl.handle.net/10019.1/69128 en Stellenbosch University 218 pages : ill. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Database management Database design Dissertations -- Computer science Deacon, Andrew Edwin Concurrency control mechanisms for multidatabase systems |
| title | Concurrency control mechanisms for multidatabase systems |
| title_full | Concurrency control mechanisms for multidatabase systems |
| title_fullStr | Concurrency control mechanisms for multidatabase systems |
| title_full_unstemmed | Concurrency control mechanisms for multidatabase systems |
| title_short | Concurrency control mechanisms for multidatabase systems |
| title_sort | concurrency control mechanisms for multidatabase systems |
| topic | Database management Database design Dissertations -- Computer science |
| url | http://hdl.handle.net/10019.1/69128 |
| work_keys_str_mv | AT deaconandrewedwin concurrencycontrolmechanismsformultidatabasesystems |