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Registro Completo |
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Biblioteca(s): |
Embrapa Agricultura Digital. |
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Data corrente: |
20/03/1998 |
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Data da última atualização: |
19/12/2007 |
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Autoria: |
BOUDJLIDA, N.; PERRIN, O. |
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Título: |
Schema updates and database restructuring. |
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Ano de publicação: |
1997 |
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Fonte/Imprenta: |
In: SIMPÓSIO BRASILEIRO DE BANCO DE DADOS, 12., 1997, Fortaleza. Anais... Fortaleza: UFC, 1997. |
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Páginas: |
p.210-225. |
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Idioma: |
Inglês |
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Notas: |
SBBD'97. Editado por Vânia Maria Ponte Vidal. |
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Conteúdo: |
Changing a database schema may affect existing data instances and programs. To deal with the side effects of schema changes on both data and programs, data must migrate to the modified schema and programs must be adapted to the modified data structures. Indeed, due to the long duration of some activities using databases, like software engineering, it is a critical need to manage several versions of a database schema. So, a piece of that must be viewed as an instance of more than one data schema. Most of the current approaches related to this research area only deal with atomic changes and do not provide a real help to achieve program adaptation follow up complex changes. Our aim is to propose a set of services which may be used to implement both data migration and program adaptation after schema changes. So, we propose a mechanism based on the identification of relationships between the data schema before the change and after the change. Such relationships help to define mapping functions as schema homomorphisms, which may be used in both data and program adaptation. Mappings are related to atomic as well as complex changes. This work is founded on a generic object-relationship data representation model on which three classes of change operations are identified and examined. Renaming operations, domain change operations and type restructuring operations. The proposed approach is analyzed for every class of schema change operations. |
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Palavras-Chave: |
Banco de dados. |
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Thesaurus Nal: |
databases. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01991naa a2200181 a 4500
001 1006167
005 2007-12-19
008 1997 bl uuuu u00u1 u #d
100 1 $aBOUDJLIDA, N.
245 $aSchema updates and database restructuring.
260 $c1997
300 $ap.210-225.
500 $aSBBD'97. Editado por Vânia Maria Ponte Vidal.
520 $aChanging a database schema may affect existing data instances and programs. To deal with the side effects of schema changes on both data and programs, data must migrate to the modified schema and programs must be adapted to the modified data structures. Indeed, due to the long duration of some activities using databases, like software engineering, it is a critical need to manage several versions of a database schema. So, a piece of that must be viewed as an instance of more than one data schema. Most of the current approaches related to this research area only deal with atomic changes and do not provide a real help to achieve program adaptation follow up complex changes. Our aim is to propose a set of services which may be used to implement both data migration and program adaptation after schema changes. So, we propose a mechanism based on the identification of relationships between the data schema before the change and after the change. Such relationships help to define mapping functions as schema homomorphisms, which may be used in both data and program adaptation. Mappings are related to atomic as well as complex changes. This work is founded on a generic object-relationship data representation model on which three classes of change operations are identified and examined. Renaming operations, domain change operations and type restructuring operations. The proposed approach is analyzed for every class of schema change operations.
650 $adatabases
653 $aBanco de dados
700 1 $aPERRIN, O.
773 $tIn: SIMPÓSIO BRASILEIRO DE BANCO DE DADOS, 12., 1997, Fortaleza. Anais... Fortaleza: UFC, 1997.
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Registro original: |
Embrapa Agricultura Digital (CNPTIA) |
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Registro completo
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Biblioteca(s): |
Catálogo Coletivo de Periódicos Embrapa; Embrapa Agroindústria Tropical; Embrapa Soja; Embrapa Trigo. |
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Identificador: |
3248 |
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Data corrente: |
09/05/2002 |
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Data da última atualização: |
08/07/2010 |
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Código do título: |
5150306 |
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ISSN: |
0250-7447 |
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Código CCN: |
032248-2 |
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Título e Subtítulo: |
FINANZAS Y DESARROLLO |
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Título alternativo: |
FINANCE AND DEVELOPMENT |
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Entidade: |
Fondo Monetario Internacional y del Banco Mundial |
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Local de publicação: |
Washington-DC |
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Periodicidade: |
Trimestral |
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Bases onde o periódico é indexado: |
PAIS BULLETIN; BIBLIOGRAPHY OF ECONOMICS |
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Inicio de publicação: |
1964 |
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Coleções da unidade: |
Embrapa Agroindústria Tropical
1978 15(3); 1989 26(2); 1990 27(1-4); 1991 28(1, 3); 1992 29(1-4); 1993 30(1-4); 1994 31(1-4); 1995 32(1-4); 1996 33(1-4); 1997 34(1-4); 1998 35(1, 3-4); 1999 36(1-2); 2000 37((1, 3); 2001 38(1-2, 4); 2002 39(1-4); 2004 41(2-3)
Classificação: 338.9005
Embrapa Soja
1972-73 9-10; 1974 11(1-3); 1975 12; 1978 15(1,4); 1979 16(1-2); 1981 18(2)
Classificação: 338.9005
Embrapa Trigo
1967/2006 4(4) 1967; 5 1968; 6 1969; 7 1970; 8(2-4) 1971; 9(2-4) 1972; 10 1973; 11 1974; 12 1975; 13 1976; 14 1977; 15 1978; 16 1979; 17 1980; 18(1-2) 1981; 29 1992; 30(1-4) 1993; 31(1-4) 1994; 32(1) 1995; 35(3) 1998; 36(2) 1999; 40(2) 2003; 41(4) 2004; 43(2-3) 2006.
Classificação: 338.9005 |
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