Managing object identity with less I/O operations

• Autor(a) principal: De Almeida, Fabio Renato [UNESP]
• Data de Publicação: 2012
• Outros Autores: Valencio, Carlos Roberto [UNESP], Ferrizzi, Andre Cid [UNESP], Tronco, Mario Luiz, De Souza, Rogeria Cristiane Gratao [UNESP]
• Tipo de documento: Artigo de conferência
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1109/PDCAT.2012.91; http://hdl.handle.net/11449/73828
• topic: b+ tree; complex data; direct mapping; hashing; indirect mapping; indirection table; NuGeM; object identifier; object identity; oid; OODBMS

Non-conventional database management systems are used to achieve a better performance when dealing with complex data. One fundamental concept of these systems is object identity (OID). Two techniques can be used for the implementation of OIDs: physical or logical. A logical implementation of OIDs, based on an Indirection Table, is used by NuGeM, a multimedia data manager kernel which is described in this paper. NuGeM Indirection Table allows the relocation of all pages in a database. The proposed strategy modifies the workings of this table so that it is possible to reduce considerably the number of I/O operations during the request and release of pages containing objects and their OIDs. Tests show a reduction of 84% in reading operations and a 67% reduction in writing operations when pages are requested. Although no changes were observed in writing operations during the release of pages, a 100% of reduction in reading operations was obtained. © 2012 IEEE.