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Registro Completo |
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Biblioteca(s): |
Embrapa Agricultura Digital. |
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Data corrente: |
25/11/1997 |
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Data da última atualização: |
19/12/2007 |
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Autoria: |
AZEVEDO, P. J.; MONTESI, D. |
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Título: |
An efficient strategy for dynamic knowledge bases. |
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Ano de publicação: |
1996 |
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Fonte/Imprenta: |
In: SIMPÓSIO BRASILEIRO DE BANCO DE DADOS, 11., 1996, São Carlos, SP. Anais... São Carlos: USP-ICMSC, 1996. |
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Páginas: |
p.73-83. |
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Idioma: |
Inglês |
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Notas: |
SBBD'96. Editado por Tereza Pires Vieira e Agma Juci Machado Traina. |
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Conteúdo: |
Dynamic knowledge bases allow their evolution over time. This evolution is expressed through updates that are packaged together for a transaction i.e a set a of updates all of which must be performed or none of them must be executed. We consider knowledge bases that can be expressed with a logic language. Considering integration between the two. In [7] an extended rule language was proposed to acommodate updates and support transactions while avoiding procedural updates. In this paper we present an extension of the magic-sets transformation and the semi-naive strategy for efficiently evaluating the extended rule language. This new transformation enables the collection of updates during the query-answering process performed by the semi-naive strategy. The collected updates are executed as transactions as the end og the evaluation, provided that they are consistent. This strategy turns to be as efficient as in the case without updates. In the case of updates, an additional computational step is performed to check the updates consistency. This step has a linear cost with respect to the number of collected updates. |
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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 01708naa a2200181 a 4500
001 1005392
005 2007-12-19
008 1996 bl uuuu u00u1 u #d
100 1 $aAZEVEDO, P. J.
245 $aAn efficient strategy for dynamic knowledge bases.
260 $c1996
300 $ap.73-83.
500 $aSBBD'96. Editado por Tereza Pires Vieira e Agma Juci Machado Traina.
520 $aDynamic knowledge bases allow their evolution over time. This evolution is expressed through updates that are packaged together for a transaction i.e a set a of updates all of which must be performed or none of them must be executed. We consider knowledge bases that can be expressed with a logic language. Considering integration between the two. In [7] an extended rule language was proposed to acommodate updates and support transactions while avoiding procedural updates. In this paper we present an extension of the magic-sets transformation and the semi-naive strategy for efficiently evaluating the extended rule language. This new transformation enables the collection of updates during the query-answering process performed by the semi-naive strategy. The collected updates are executed as transactions as the end og the evaluation, provided that they are consistent. This strategy turns to be as efficient as in the case without updates. In the case of updates, an additional computational step is performed to check the updates consistency. This step has a linear cost with respect to the number of collected updates.
650 $adatabases
653 $aBanco de dados
700 1 $aMONTESI, D.
773 $tIn: SIMPÓSIO BRASILEIRO DE BANCO DE DADOS, 11., 1996, São Carlos, SP. Anais... São Carlos: USP-ICMSC, 1996.
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Registro original: |
Embrapa Agricultura Digital (CNPTIA) |
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