图 书 馆
QB4OLAP：SemanticWeb上OLAP多维数据集的新词汇表？QB4OLAP: A New Vocabulary for OLAP Cubes on the SemanticWeb? |
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| 课程网址: | http://videolectures.net/iswc2012_etcheverry_olap_cubes/ |
| 主讲教师: | Lorena Etcheverry |
| 开课单位: | 共和国大学 |
| 开课时间: | 2012-12-03 |
| 课程语种: | 英语 |
| 中文简介: |  |
| 课程简介: | On-Line Analytical Processing (OLAP) tools allow querying large multidimensional (MD) databases called data warehouses (DW). OLAP-style data analysis over the semantic web (SW) is gaining momentum, and thus SW technologies will be needed to model, manipulate, and share MD data. To achieve this, the definition of a vocabulary that adequately represents OLAP data is required. Unfortunately, so far, the proposals in this direction have followed different roads. On the one hand, the QB vocabulary (a proposal by the W3C Government Linked Data Working Group) follows a model initially devised for analyzing statistical data, but does not adequately support OLAP multidimensional data. Another recent proposal, the Open Cube vocabulary (OC) follows closely the classic MD models for OLAP and allows implementing OLAP operators as SPARQL queries, but does not provide a mechanism for reusing data already published using QB. In this work, we propose a new vocabulary, denoted QB4OLAP, which extends QB to fully support OLAP models and operators.We show how data already published in QB can be analyzed à la OLAP using the QB4OLAP vocabulary, and vice versa. To this end we provide algorithms that build the structures that allow performing both kinds of analysis, and show that compatibility between QB and QB4OLAP can be achieved at low cost, only adding dimensional information. |
| 关 键 词: | 在线分析处理; 数据仓库; 大型多维数据库 |
| 课程来源: | 视频讲座网 |
| 最后编审: | 2019-05-08：cjy |
| 阅读次数: | 70 |