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Proceedings of 7th International Conference and Workshop on Database and Expert Systems Applications: DEXA 96最新文献

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Join sequence optimization in parallel query plans 并行查询计划中的连接序列优化
Proceedings of 7th International Conference and Workshop on Database and Expert Systems Applications: DEXA 96 Pub Date : 1996-09-09 DOI: 10.1109/DEXA.1996.558601
U. Langer, Holger Meyer
{"title":"Join sequence optimization in parallel query plans","authors":"U. Langer, Holger Meyer","doi":"10.1109/DEXA.1996.558601","DOIUrl":"https://doi.org/10.1109/DEXA.1996.558601","url":null,"abstract":"We show an alternative way to optimize join sequences in a shared nothing architecture of the distributed relational DBMS HEAD. The hardware resources are also used for database independent applications in concurrency, for database access. To achieve a better hardware utilization we span a complete search space involving all intermediate shapes between left deep, right deep and bushy trees, but without join sequences including cartesian products. The approach is based on any combinatorial search engine and a complex cost function. The cost function involves the actual load of the processors, the network load, and the memory capacities. The new technique has free access to any join sequence in the whole search space. The approach is not restricted to acyclic join conditions.","PeriodicalId":438695,"journal":{"name":"Proceedings of 7th International Conference and Workshop on Database and Expert Systems Applications: DEXA 96","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131157700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On the query translation in federative relational databases 联邦关系数据库中的查询转换
Proceedings of 7th International Conference and Workshop on Database and Expert Systems Applications: DEXA 96 Pub Date : 1996-09-09 DOI: 10.1109/DEXA.1996.558599
Yangjun Chen, W. Benn
{"title":"On the query translation in federative relational databases","authors":"Yangjun Chen, W. Benn","doi":"10.1109/DEXA.1996.558599","DOIUrl":"https://doi.org/10.1109/DEXA.1996.558599","url":null,"abstract":"The authors address the problem of query translation in a federative relational database system, and present a new method to specify semantic correspondences and data mappings. Several algorithms are described and discussed in detail, which can be used to translate queries automatically even if the local databases have data and schema conflicts.","PeriodicalId":438695,"journal":{"name":"Proceedings of 7th International Conference and Workshop on Database and Expert Systems Applications: DEXA 96","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127771564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
An approach to multiparadigm programming database systems 数据库系统的多范式编程方法
Proceedings of 7th International Conference and Workshop on Database and Expert Systems Applications: DEXA 96 Pub Date : 1996-09-09 DOI: 10.1109/DEXA.1996.558340
J. Han
{"title":"An approach to multiparadigm programming database systems","authors":"J. Han","doi":"10.1109/DEXA.1996.558340","DOIUrl":"https://doi.org/10.1109/DEXA.1996.558340","url":null,"abstract":"One way to tackle the impedance mismatch problem is to build multiparadigm programming database systems. The author analyzes a stratified LDL program by partitioning it into modules. It is shown by example that many embedded SQL programs may be programmed easily and elegantly in nonrecursive LDL. First, multiparadigm programming relational database systems may be built for nonrecursive LDL, which are easier to design and implement than multiparadigm programming deductive database systems based on recursive LDL. One may then incrementally add modules to handle various recursions. Multiparadigm programming deductive database systems are more powerful and provide more programming methodologies to choose from but are more difficult to construct.","PeriodicalId":438695,"journal":{"name":"Proceedings of 7th International Conference and Workshop on Database and Expert Systems Applications: DEXA 96","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134484462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Conceptual modeling of statistical data 统计数据的概念建模
Proceedings of 7th International Conference and Workshop on Database and Expert Systems Applications: DEXA 96 Pub Date : 1996-09-09 DOI: 10.1109/DEXA.1996.558348
J. Pokorný
{"title":"Conceptual modeling of statistical data","authors":"J. Pokorný","doi":"10.1109/DEXA.1996.558348","DOIUrl":"https://doi.org/10.1109/DEXA.1996.558348","url":null,"abstract":"A conceptual modeling of statistical objects based on a functional approach is presented. The notion of attribute as a basic modeling construct is used. The presented results show how to deal exactly some very known notions and how to extend and precise them. As a logical consequence of using the typed lambda calculus for description of semantics, some new constructs were proposed. A horizontal and vertical structuralization, horizontal and vertical statistical classification are shown as necessary and useful in modeling of statistical reality.","PeriodicalId":438695,"journal":{"name":"Proceedings of 7th International Conference and Workshop on Database and Expert Systems Applications: DEXA 96","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114148830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Modelling multimedia structured documents: a retrieval oriented approach 多媒体结构化文档建模:面向检索的方法
Proceedings of 7th International Conference and Workshop on Database and Expert Systems Applications: DEXA 96 Pub Date : 1996-09-09 DOI: 10.1109/DEXA.1996.558292
F. Fourel, P. Mulhem
{"title":"Modelling multimedia structured documents: a retrieval oriented approach","authors":"F. Fourel, P. Mulhem","doi":"10.1109/DEXA.1996.558292","DOIUrl":"https://doi.org/10.1109/DEXA.1996.558292","url":null,"abstract":"The authors describe the modelling of multimedia structured documents according to the potential retrieval methods. They consider that the works already done on such documents do not focus on this point enough. So, their model is based on views that reflect the potential ways of \"seeing\" multimedia documents. The semantic content of a document is one way of seeing documents. So, another problem is the way to determine this semantic content by using semantic channels between composing and composed documents. They present an application of their work in the RIME medical context dealing with texts and still images.","PeriodicalId":438695,"journal":{"name":"Proceedings of 7th International Conference and Workshop on Database and Expert Systems Applications: DEXA 96","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124873813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Towards a highly scalable architecture for workflow management systems 为工作流管理系统提供一个高度可扩展的架构
Proceedings of 7th International Conference and Workshop on Database and Expert Systems Applications: DEXA 96 Pub Date : 1996-09-09 DOI: 10.1109/DEXA.1996.558591
Petra Heinl, H. Schuster
{"title":"Towards a highly scalable architecture for workflow management systems","authors":"Petra Heinl, H. Schuster","doi":"10.1109/DEXA.1996.558591","DOIUrl":"https://doi.org/10.1109/DEXA.1996.558591","url":null,"abstract":"Workflow management is aimed at the execution of business processes within an enterprise. Workflow management systems (WfMSs) build an execution platform for business processes in organizations of any size and structure. Performance is an important criteria for the applicability of WfMSs; they have to be scalable to varying load situations. The authors present a modular logical WfMS architecture, which is the basis for configuring the WfMS according to the performance needs of the application environment. Based on this logical architecture they define a data partitioning and replication scheme which allows to replicate and distribute components of the WfMS without raising synchronization efforts. As a consequence, the proposed physical architecture provides scalability.","PeriodicalId":438695,"journal":{"name":"Proceedings of 7th International Conference and Workshop on Database and Expert Systems Applications: DEXA 96","volume":"148 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123643503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 22
Vertical fragmentation in distributed object database systems with complex attributes and methods 具有复杂属性和方法的分布式对象数据库系统中的垂直碎片
Proceedings of 7th International Conference and Workshop on Database and Expert Systems Applications: DEXA 96 Pub Date : 1996-09-09 DOI: 10.1109/DEXA.1996.558266
Ladjel Bellatreche, A. Simonet, M. Simonet
{"title":"Vertical fragmentation in distributed object database systems with complex attributes and methods","authors":"Ladjel Bellatreche, A. Simonet, M. Simonet","doi":"10.1109/DEXA.1996.558266","DOIUrl":"https://doi.org/10.1109/DEXA.1996.558266","url":null,"abstract":"Object oriented database management systems are becoming popular and are being used in a large number of application domains, many of which are inherently distributed. Optimal application performance of a distributed object oriented database system requires class fragmentation and the development of allocation schemes to place fragments at distributed sites in order to minimize data transfer. Our approach is top down, and the entity of fragmentation is the class. Fragmentation algorithms have been proposed for the relational model, but the object model is relatively untouched. We present an algorithm for vertical fragmentation in a model consisting of complex attributes and complex methods. This type of fragmentation facilitates query decomposition, optimization, and parallel treatment for distributed object oriented database systems.","PeriodicalId":438695,"journal":{"name":"Proceedings of 7th International Conference and Workshop on Database and Expert Systems Applications: DEXA 96","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123818604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 36
Query processing in Distributed PIOS 分布式PIOS中的查询处理
Proceedings of 7th International Conference and Workshop on Database and Expert Systems Applications: DEXA 96 Pub Date : 1996-09-09 DOI: 10.1109/DEXA.1996.558596
F. Rabitti, L. Benedetti, F. Demi
{"title":"Query processing in Distributed PIOS","authors":"F. Rabitti, L. Benedetti, F. Demi","doi":"10.1109/DEXA.1996.558596","DOIUrl":"https://doi.org/10.1109/DEXA.1996.558596","url":null,"abstract":"An approach to query processing in object oriented distributed database systems is proposed. Distributed PIOS is a server that supports an object-oriented data model, physical data independence (i.e. different strategies for storing class hierarchies, grouping, horizontal and vertical partitioning of objects), and fragmentation transparency (i.e. transactions are not aware of the distribution of database fragments on several nodes of a computer network). The problem of the optimization of distributed queries (i.e. determining which data must be accessed at which site and which data must be transmitted among sites) is the focus of the paper.","PeriodicalId":438695,"journal":{"name":"Proceedings of 7th International Conference and Workshop on Database and Expert Systems Applications: DEXA 96","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129494197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A comparison of morpheme and word based document retrieval for Asian languages 基于语素和词的亚洲语言文献检索的比较
Proceedings of 7th International Conference and Workshop on Database and Expert Systems Applications: DEXA 96 Pub Date : 1996-09-09 DOI: 10.1109/DEXA.1996.558329
Van Be Hai Nguyen, Phil Vines, R. Wilkinson
{"title":"A comparison of morpheme and word based document retrieval for Asian languages","authors":"Van Be Hai Nguyen, Phil Vines, R. Wilkinson","doi":"10.1109/DEXA.1996.558329","DOIUrl":"https://doi.org/10.1109/DEXA.1996.558329","url":null,"abstract":"Most document retrieval systems are word based. Words are very convenient retrieval units in English but not so in some Asian languages. The task of determining which morphemes constitute words in Vietnamese and Chinese is problematic, and has been assumed to be the reason that word based retrieval does not work so well. The paper examines a number of segmentation algorithms, and then reports on some experiments comparing morpheme and word based retrieval. It shows that morpheme based retrieval is hard to improve on.","PeriodicalId":438695,"journal":{"name":"Proceedings of 7th International Conference and Workshop on Database and Expert Systems Applications: DEXA 96","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116177857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Extracting symbolic objects from relational databases 从关系数据库中提取符号对象
Proceedings of 7th International Conference and Workshop on Database and Expert Systems Applications: DEXA 96 Pub Date : 1996-09-09 DOI: 10.1109/DEXA.1996.558606
Véronique Stéphan
{"title":"Extracting symbolic objects from relational databases","authors":"Véronique Stéphan","doi":"10.1109/DEXA.1996.558606","DOIUrl":"https://doi.org/10.1109/DEXA.1996.558606","url":null,"abstract":"Our aim is to define operators to retrieve groups of individuals from a relational database. The way we describe these groups makes it possible to analyse them by symbolic data analysis methods which extend classical ones to more complex data. In so far as the input consists of groups of data extensionally defined in the database, our problem is to find the best description representing each group in the formalism (called symbolic object) of symbolic data analysis. In our process, we take into account data from tables together with additional knowledge such as taxonomies. To describe each group, we perform a generalization step and a specialization one. Final descriptions are based on the notion of homogeneity within a group and they minimize a volume criterion.","PeriodicalId":438695,"journal":{"name":"Proceedings of 7th International Conference and Workshop on Database and Expert Systems Applications: DEXA 96","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126379912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
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