S. M. Deen, R. R. Amin, and M. C. Taylor. Data integration in distributed databases. Transactions on Software Engineering, SE-13(7):860-864, July 1987.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....models and further details such as prices. Thus, the information agent has to decompose user queries to several queries suited for the given information providers. Then information has to be integrated again. Decomposing queries and integrating partial solutions involves several problems [CP85, DAT93] 1. Horizontal fragmentation: the relation r is distributed over several providers. For example, the relation of car companies and their models with corresponding attributes may be distributed over the car companies. 2. Vertical fragmentation: the attributes of r are distributed over several ....

S. M. Deen, R. R. Amin, and M. C. Taylor. Data integration in distributed databases. In A. R. Hurson, M. W. Bright, and S. H. Pakzad, editors, Multidatabase Systems: An Advanced Solution for Global Information Sharing, pages 255--259. IEEE Press, 1993.

....differences, and structural differences. This global view of combined data is commonly called a global schema or integrated schema. A global schema provides location transparency to the user and hides the differences among the component databases, thus facilitating formulation of global queries [1,5]. Access Control. Access control provides local DBMS s the power to prevent unauthorized access or malicious destruction of its databases, in this case, from multidatabase systems. This would not only include controlling access in the local DBMS s at each site, but also controlling and ....

....concerning an entity. There are three cases of integrating relations with missing data: 1) data which is missing from both relations, 2) data which is missing from one relation, and (3) data that is found in the first relation and is summarize in the other but does not include all the details [1]. Data Missing from Both Relations refers to information which is implicitly available to local users, but which is not stored [1] Conflicting values two databases refers to the same realworld object but their actual data values are conflicting Semantic Difference two attributes use ....

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Deen, S.M., R. R. Amin, and M. C. Taylor, "Data Integration in Distributed Databases", IEEE Transaction on Software Engineering, 13(7), pp. 806-864, (1987).

....al. 33] P F Ventrone and Heiler [34] F Kim and Seo [18] F F F F F F F F F F Reddy, Prasad, Gupta [28] F F P F F F F F Breitbart, Olson et al. 42] F F F F F Fankhauser, Neuhold [35] P Sheth and Kashyap [36] F F F F F F F F Jeffery, Hutchinson et al. 26] P P F F F P F Deen, Amin. Taylor [25] P P P P F accessible in another in other words, finding attribute equivalences. The simplest form of heterogeneity in this regard is that of naming conflicts and naming heterogeneity. In general, the categories of structural and naming heterogeneties are recognised by most authors, e.g. ....

....degree and cardinality constraints [11,22] The second major form of heterogeneity is concerned with differences in the representations of values. Again a number of authors recognise differences in units and granularity as well as differences in data types and structure. These include Deen et al. [25], Bukhres et al. 14] Jeffery et al. 26] and Larson et al. 13] who also cover differences in level of abstraction and in object identifier, Chatterjee and Segev [21] who include codes, incomplete information and recording errors, and Navathe and Savasere [27] who include data type and scale. ....

S.M. Deen, R.R. Amin, M.C. Taylor, Data integration in distributed databases, IEEE Trans. Software Engng SE-13 (7) (1987) 860--864.

....build the integrated schema. A QUEL like language is defined for superview definition and as user query language. The authors advocate that this choice results in a more powerful and more versatile integration methodology. A similar approach may be found in the PRECI distributed database system [9]. Its authors are concerned with integration of relational databases. An algebraic restructuring language is proposed, resulting in mappings expressed as algebraic transformations. In the authors opinion, this greatly facilitates query modification. Integration of relational databases also is ....

S. Deen, et al.: Data Integration in Distributed Databases, IEEE Transactions On Software Engineering, Vol.SE-13, n7, July 1987, 860-864

....by integrating schemas of the component databases. In this paper, we study the strategy for integrating multiple object schemas, and the mechanism to process global queries against the integrated global schema. A variety of approaches to schema integration have been proposed [1] 2] 8] [6], 9] 10] 14] 17] Batini, et al. discussed twelve methodologies for database or view integration [1] Czejdo, et al. used a language with graphical user interface to perform schema integration in federated database systems [4] Schema and domain incompatibilities were considered in [4] ....

S.M. Deen, R.R. Amin, and M.C. Taylor. "Data integration in distributed databases". IEEE Transactions on Software Engineering, pages 860--864, 1987.

....Before we can specify the interdatabase dependencies, we must eliminate incompatibilities that may exist among related data items in different databases. The corresponding data items in different databases, may have different names, and may be defined using different data types and or units [DH84, DAT87] We will not address the problem of resolving data incompatibility in this chapter. Rather, we assume that there is a method [RCE 88] possibly involving the use of a dictionary, thesaurus, knowledge base, and or an auxiliary database, which may be used to identify the correspondences ....

S.M. Deen, R.R. Amin, and M.C. Taylor. Data Integration in Distributed Databases. IEEE Transactions on Software Engineering, SE-13(7):860--864, 1987.

....provide a uniform interface and high level location transparency for the users to retrieve data in a heterogeneous database system, a global schema is usually created by integrating schemas of the component databases. A variety of approaches to schema integration have been proposed [1] 2] 7] [8], 10] 11] 14] 16] Batini et al. discussed twelve methodologies for database or view integration [1] Czejdo, et al. used a language with graphical user interface to perform schema integration in federated database systems [6] Schema and domain incompatibilities were considered in [6] 9] ....

S.M. Deen, R.R. Amin, and M.C. Taylor, Data integration in distributed databases, IEEE Transactions on Software Engineering, SE-13 (7) (1987) pp.860-864.

No context found.

S. M. Deen, R. R. Amin, and M. C. Taylor. Data integration in distributed databases. Transactions on Software Engineering, SE-13(7):860-864, July 1987.

No context found.

S. M. Deen, R. R. Amin, and M. C. Taylor. Data integration in distributed databases. Transactions on Software Engineering, SE-13(7):860-864, July 1987.

No context found.

DAT87 S.M. Deen, R.R. Amin, and M.C. Taylor, "Data integration in distributed databases," IEEE Trans. Software Eng., vol. 13, no. 7, 1987.

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