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Proceedings of the 1994 ACM SIGMOD international conference on Management of data

作者： Won Kim UniSQL Inc. 9390 Research Blvd. Austin Texas

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ISBN: (纸本)9780897916394

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ON RESOLVING SCHEMATIC HETEROGENEITY IN MULTIDATABASE SYSTEMS

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DISTRIBUTED AND PARALLEL DATABASES 1993年第3期1卷 251-279页

作者： KIM, W CHOI, I GALA, S SCHEEVEL, M 1. UniSQL Inc. 78759 Austin Texas

The objective of a multidatabase system is to provide a single uniform interface to accessing multiple independent databases being managed by multiple independent, and possibly heterogeneous, database systems. One crucial element in the design of a muitidatabase system is the design of a data definition language for specifying a schema that represents the integration of the schemas of multiple independent databases. The design of such a language in turn requires a comprehensive classification of the conflicts (i.e., discrepancies) among the schemas of the independent databases and development of techniques for resolving (i.e., homogenizing) all of the conflicts in the classification. An earlier paper provided a comprehensive classification of schematic conflicts that may arise when integrating multiple independent relational database (RDB) schemas into a single multidatabase (MDB) schema. In this paper, we provide a comprehensive classification of techniques for resolving the schematic conflicts that may arise when integrating multiple RDB schemas, or RDB schemas and object-oriented database (OODB) schemas, or multiple OODB schemas. The classification of conflict resolution techniques includes not only those necessary for resolving schematic conflicts identified in the earlier paper, but also additional conflicts that arise when OODBs become part of the databases to be integrated. Most of the conflict resolution techniques discussed in the paper have already been incorporated into SQL/M, a multidatabase language implemented in unisql/M, a commercially available multidatabase system from unisql, Inc. which integrated SQL-based relational database systems and the unisql/X unified relational and object-oriented database system.

关键词： MULTIDATABASE SYSTEM OBJECT-ORIENTED DATABASE SCHEMATIC HETEROGENEITY

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Voltaire: A database programming language with a single execution model for evaluating queries, constraints, and functions

Voltaire: A database programming language with a single exec...

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1993 IEEE 9th International Conference on Data Engineering

作者： Gala, Sunit K. Navathe, Shamkant B. Bermudez, Manuel E. UniSQL Inc Austin United States

ISBN: (纸本)0818635703

Voltaire is a set-oriented, imperative database programming language. The data definition facility is similar to that of most semantic data models. The class definition incorporates both structure and behavior;classes and functions have an equivalent semantics in Voltaire. There are no arbitrary restrictions on the persistence of values - even functions can have a persistent extent. The set expressions in the language are conducive to data intensive programming while maintaining a certain amount of efficiency by espousing the imperative paradigm. The query language incorporates functions by providing access to the persistent extent of a function or by allowing an actual function call. The system enforces integrity in a lazy evaluation mode. Functions are effectively computed as the result of integrity enforcement. This is because we consider constraints as a sequence of commands to be evaluated (i.e., satisfied) in the specified order. The language is defined in a modular but additive fashion. This facilitates some measure of bootstrapping, thus providing a single execution model for evaluating queries, enforcing constraints and computing functions.

关键词： Database systems

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Global committability in multidatabase systems

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IEEE TRANSACTIONS ON KNOWLEDGE AND DATA ENGINEERING 1996年第5期8卷 816-824页

作者： Elmagarmid, AK Jing, J Kim, W Bukhres, I Zhang, AD INTEL CORP HILLSBORO OR 97124 USA UNISQL INC AUSTIN TX 78759 USA

In this paper we develop a formal basis for research into the reliability aspects of transaction processing in multidatabase systems. We define a new correctness notion called global committability (GC) for the correct unilateral commit and retry recovery of global transactions in an autonomous MDBS environment. This notion facilitates to ensure the isolation property of global transactions when the retry approach is applied. The formalization work illustrates that conventional serializability (SR) notion and recoverability (RC) notion are not sufficient to specify a correct execution (i.e., isolated execution and recovery) of global transactions when the unilateral commit and the retry recovery are used to ensure the atomicity of global transactions. This work is significant because the unilateral commit and the retry recovery is an attractive complementary means to the undo recovery (whose correct schedule is specified by the conventional RC notion) for advanced transaction applications with characteristics of site autonomy and long-lived execution.

关键词： multidatabases transaction management global transactions local transactions unilateral commit retry recovery serializability recoverability global committability

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A THEORY OF TRANSLATION FROM RELATIONAL QUERIES TO HIERARCHICAL QUERIES

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IEEE TRANSACTIONS ON KNOWLEDGE AND DATA ENGINEERING 1995年第2期7卷 228-245页

作者： MENG, WY YU, C KIM, W UNISQL INC AUSTINTX UNIV ILLINOIS DEPT ELECT ENGN & COMP SCICHICAGOIL 60680

In a heterogeneous database system, a query for one type of database system (i.e., a source query) may have to be translated to an equivalent query (or queries) for execution in a different type of database system (i.e., a target query). Usually, for a given source query, there is more than one possible target query translation. Some of them can be executed more efficiently than others by the receiving database system. Developing a translation procedure for each type of database system is time consuming and expensive. In this paper, we abstract a generic hierarchical database system (GHDBS) which has properties common to database systems whose schema contains hierarchical structures (e.g., System 2000, IMS, and some object-oriented database systems), We develop principles of query translation with GHDBS as the receiving database system. Translation into any specific system can be accomplished by a translation into the general system with refinements to reflect the characteristics of the specific system, We develop rules that guarantee correctness of the target queries, where correctness means that the target query is equivalent to the source query. We also provide rules that can guarantee a minimum number of target queries in cases when one source query needs to be translated to multiple target queries. Since the minimum number of target queries implies the minimum number of times the underlying system will be invoked, efficiency is taken into consideration.

关键词： DATABASE RELATIONAL HIERARCHICAL QUERY TRANSLATION HETEROGENEOUS SYSTEM

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INFORMATION-PROCESSING MODELS FOR SLEEP STAGING

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EXPERT SYSTEMS WITH APPLICATIONS 1993年第4期6卷 399-409页

作者： PRINCIPE, JC CHANG, TG GALA, S TOME, A CHUNG ANG UNIV SEOULSOUTH KOREA UNISQL INC AUSTINTX UNIV AVEIRO INESCAVEIROPORTUGAL

Three different methods of automated sleep staging are described and compared in the paper. The interesting aspect of the comparison is that the inputs to the three different information processing models (an expert system, a belief automaton, and a neural network) are the outputs of the same frontend processor that extracts EEG features. We found out that the level of man-machine agreement is very similar among the systems (around 85%) approaching the level of agreement required among human experts. However, the similarity of performance in such a diversified set of approaches points out the need for enhancing the accuracy of the first level of analysis (EEG feature extraction).

关键词： Data processing

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AN IBIS AND OBJECT-ORIENTED APPROACH TO SCIENTIFIC-RESEARCH DATA MANAGEMENT

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JOURNAL OF SYSTEMS AND SOFTWARE 1993年第2期23卷 183-197页

作者： KIM, W SUH, YM WHINSTON, AB UNISQL INC AUSTINTX 78759 SAMSUNG DATA SYST SEOULSOUTH KOREA UNIV TEXAS AUSTINTX 78712

One of the major challenges in information systems technology is to build a system of scientific data bases and associated tools to assist collaborative research among scientists worldwide across a broad range of scientific disciplines. Two of the many important issues that need to be addressed in meeting this challenge are the selection of a collaboration paradigm for the scientists and a technology for the management of a large-volume scientific data base. We propose the use of an issue-based collaborative exploration paradigm and an object-oriented data base technology for managing a large scientific data base.

关键词： Database systems

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ON UNIFYING RELATIONAL AND OBJECT ORIENTED DATABASE-SYSTEMS 6th

ON UNIFYING RELATIONAL AND OBJECT ORIENTED DATABASE-SYSTEMS

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6TH EUROPEAN CONF ON OBJECT-ORIENTED PROGRAMMING ( ECOOP 92 )

作者： KIM, W UniSQL Inc. 9390 Research Blvd Austin 78759 TX United States

ISBN: (纸本)3540556680

The past several years have been the gestation period for a new generation of database technology. There has been a flurry of activities to develop and experiment with database systems that support an object-oriented data model or that extend the relational data model with some object-oriented facilities. These activities have been fueled by the emergence of a broad spectrum of database applications which relational database systems cannot support and the increasing need to achieve another productivity leap in application development. As a result of these efforts, there is now a sufficient body of knowledge for the development of a commercially viable next-generation database system. Such a system should support a unified relational and object--oriented data model;that is, a full object-oriented data model in a way that is completely compatible with the relational model. This article examines motivations for unifying the relational and object-oriented data models in a single database system, and outlines design and implementation issues that must be addressed in building such a system. © Springer-Verlag Berlin Heidelberg 1992.

关键词： Relational database systems

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Spatial data management in database systems: Research directions 3rd

Spatial data management in database systems: Research direct...

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3rd International Symposium on Large Spatial Databases, SSD 1993

作者： Kim, Won Garza, Jorge Keskin, Ali UniSQL Inc 9390 Research Blvd AustinTX78759 United States

ISBN: (纸本)9783540568698

Spatial data management has been an active area o| research during the past two decades, and results of research into spatial data structures and research into mapping spatial data into records in relational databases have found their way into commercial implementations of geographical information systems. However, no commercial database system today directly supports spatial data management, in particular, data definition and query facilities for spatial data. The objective of this paper is to identify a number of key issues that need to be addressed in the near term before we can expect to see a rich support of spatial data management in commercial database systems. © Springer-Verlag Berlin Heidelberg 1993.

关键词： Query processing

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Querying object oriented databases 92

Querying object oriented databases

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Proceedings of the 1992 ACM SIGMOD International Conference on Management of Data

作者： Kifer, Michael Kim, Wong Sagiv, Yehoshua University of Toronto UniSQL Inc. Austin TX The Hebrew University of Jerusalem

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