9th International Database Engineering & Application Symposium (IDEAS'05)最新文献_第5页

Fault-tolerance in distributed query processing 分布式查询处理中的容错

9th International Database Engineering & Application Symposium (IDEAS'05) Pub Date : 2005-07-25 DOI: 10.1109/IDEAS.2005.29

Jim Smith, P. Watson

{"title":"Fault-tolerance in distributed query processing","authors":"Jim Smith, P. Watson","doi":"10.1109/IDEAS.2005.29","DOIUrl":"https://doi.org/10.1109/IDEAS.2005.29","url":null,"abstract":"Fault-tolerance has long been a feature of database systems, with transactions supporting the structuring of applications so as to ensure continuation of updating applications in spite of machine failures. For read-only queries the perceived wisdom has been that support for fault-tolerance is too expensive to be worthwhile. Distributed query processing is coming to be seen as a promising way of implementing applications that combine structured data and analysis operations in dynamic distributed settings such as computational grids. Such a query may be long-running and having to redo the whole query after a failure may cause problems (e.g. if the result may trigger business or safety critical activities). This work describes and evaluates a new scheme for adding fault-tolerance to distributed query processing through a rollback-recovery mechanism. The high level expression of user requests in a physical algebra offers opportunities for tuning the fault-tolerance provision so as to reduce the cost, and give better performance than employment of generic fault-tolerance mechanisms at the lowest level of query processing. This paper outlines how the publicly-available OGSA-DQP computational grid-based distributed query processing system can be modified to include support for fault-tolerance and presents a performance evaluation which includes measurements of the cost of both protocol overheads and rollback-recovery, for a set of example distributed queries.","PeriodicalId":357591,"journal":{"name":"9th International Database Engineering & Application Symposium (IDEAS'05)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124213063","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: 33

Querying with negation in data integration systems 数据集成系统中的否定查询

9th International Database Engineering & Application Symposium (IDEAS'05) Pub Date : 2005-07-25 DOI: 10.1109/IDEAS.2005.47

Z. Majkic

引用次数: 7

Utilizing indexes for approximate and on-line nearest neighbor queries 利用索引进行近似查询和联机最近邻查询

9th International Database Engineering & Application Symposium (IDEAS'05) Pub Date : 2005-07-25 DOI: 10.1109/IDEAS.2005.54

King-Ip Lin, Michael Nolen, Koteswara Kommeneni

引用次数: 12

Incremental fusion of XML fragments through semantic identifiers 通过语义标识符增量融合XML片段

9th International Database Engineering & Application Symposium (IDEAS'05) Pub Date : 2005-07-25 DOI: 10.1109/IDEAS.2005.34

M. El-Sayed, Elke A. Rundensteiner, Murali Mani

{"title":"Incremental fusion of XML fragments through semantic identifiers","authors":"M. El-Sayed, Elke A. Rundensteiner, Murali Mani","doi":"10.1109/IDEAS.2005.34","DOIUrl":"https://doi.org/10.1109/IDEAS.2005.34","url":null,"abstract":"Many applications, like materialized view maintenance and stream query processing, construct views incrementally over data sources. This results in computed pieces of objects that need to be merged by fusing corresponding objects together. This problem is challenging when dealing with XML data for many reasons including the hierarchical and semi-structured nature of XML data. Also XML query languages (e.g., XQuery) are capable of performing complex operations and transformations such as arbitrary nesting and result reconstruction. Moreover, since XML is an ordered data model, XML order has to be taken into consideration when constructing XML results incrementally. In this paper we study the problem of how to fuse XML pieces (fragments) generated by incrementally processing XML data into XML results. We consider an expressive subset of XQuery language transformations and propose an id-based solution for this problem that supports XML order. We prove the correctness of our approach, in particular that using our mechanism we can correctly yet incrementally merge XML result fragments. We have implemented our proposed semantic identifiers solution. Our experimental results show that it comes with a very small overhead to the query execution time.","PeriodicalId":357591,"journal":{"name":"9th International Database Engineering & Application Symposium (IDEAS'05)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126785926","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: 6