A data description language approach to file translation

Merten, Alan G.; Fry, James P.

doi:10.1145/800296.811512

Cited by 19 publications

(8 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These approaches, too, are based on prespecified correspondence rules. It must be mentioned that file translation, schema mapping, and database restructuring are ancient database problems, with seminal work, often-ignored, done over 25 years ago (for example, [17,24,23]). …”

Section: Introductionmentioning

confidence: 99%

Autoplex: Automated Discovery of Content for Virtual Databases

Berlin

Motro

2001

Cooperative Information Systems

View full text Add to dashboard Cite

Abstract. Most virtual database systems are suitable for environments in which the set of member information sources is small and stable. Consequently, present virtual database systems do not scale up very well. The main reason is the complexity and cost of incorporating new information sources into the virtual database. In this paper we describe a system, called Autoplex, which uses machine learning techniques for automating the discovery of new content for virtual database systems. Autoplex assumes that several information sources have already been incorporated ("mapped") into the virtual database system by human experts (as done in standard virtual database systems). Autoplex learns the features of these examples. It then applies this knowledge to new candidate sources, trying to infer views that "resemble" the examples. In this paper we report initial results from the Autoplex project.

show abstract

Section: Introductionmentioning

confidence: 99%

Autoplex: Automated Discovery of Content for Virtual Databases

Berlin

Motro

2001

Cooperative Information Systems

View full text Add to dashboard Cite

show abstract

“…Such rest,ructuring algorithms can be implemented in concert with a database management system, provided the target database is to reside on the same system. Otherwise, a generalized restructurer is postulated as an obvious extension to the control module of the generalized data translator (Merten and Fry [7]). …”

Section: Discussionmentioning

confidence: 99%

Restructuring for large databases

Navathe

Fry

1976

ACM Trans. Database Syst.

Self Cite

View full text Add to dashboard Cite

The development of a powerful restructuring function involves two important components-the unambiguous specification of the restructuring operations and the realization of these operations in a software system. This paper is directed to the first component in the belief that a precise specification will provide a firm foundation for the development of restructuring algorithms and, subsequently, their implementation. The paper completely defines the semantics of the restructuring of tree structured databases.The delineation of the restructuring function is accomplished by formulating three different levels of abstraction, with each level of abstraction representing successively more detailed semantics of the function.At the first level of abstraction, the schema modification, three types are identified-naming, combining, and relating; these three types are further divided into eight schema operations. The second level of abstraction, the instance operations, constitutes the transformations on the data instances; they are divided into group operations such as replication, factoring, union, etc., and group relation operations such as collapsing, refinement, fusion, etc. The final level, the item value operations, includes the actual item operations, such as copy value, delete value, or create a null value.

show abstract

“…The existing body of research in database restructuring is devoted to development of generalized approaches to restructuring [lo, 15,16,181, providing a delineation of the restructuring process into classes of operations [17], defining -S. 6. Navathe high-level restructuring specification languages [3,21,22,241, investigating the implications of database restructuring on the processes which operate on the database [12, 271, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Navathe high-level restructuring specification languages [3,21,22,241, investigating the implications of database restructuring on the processes which operate on the database [12, 271, etc. Some software systems for database restructuring have already been implemented [2,11,15,231. We use the term restructuring user to refer to a person who wishes to restructure an existing set of data from a source environment to a target environment.…”

Section: Introductionmentioning

confidence: 99%

Schema analysis for database restructuring

Navathe

1980

ACM Trans. Database Syst.

View full text Add to dashboard Cite

The problem of generalized restructuring of databases has been addressed with two limitations: first, it is assumed that the restructuring user is able to describe the source and target databases in terms of the implicit data model of a particular methodology; second, the restructuring user is faced with the task of judging the scope and applicability of the defined types of restructuring to his database implementation and then of actually specifying his restructuring needs by translating them into the restructuring operations on a foreign data model. A certain amount of analysis of the logical and physical structure of databases must be performed, and the basic ingredients for such an analysis are developed here. The distinction between hierarchical and nonhierarchical data relationships is discussed, and a classification for database schemata is proposed. Examples are given to illustrate how these schemata arise in the conventional hierarchical and network systems. Application of the schema analysis methodology to restructuring specification is also discussed. An example is presented to illustrate the different implications of restructuring three seemingly identical database structures.

show abstract

A data description language approach to file translation

Cited by 19 publications

References 3 publications

Autoplex: Automated Discovery of Content for Virtual Databases

Autoplex: Automated Discovery of Content for Virtual Databases

Restructuring for large databases

Schema analysis for database restructuring

Contact Info

Product

Resources

About