Evaluating XML-Extended OLAP Queries Based on Physical Algebra
نویسندگان
چکیده
منابع مشابه
Algebra-Based Optimization of XML-Extended OLAP Queries
In today’s OLAP systems, integrating fast changing data physically into a cube is complex and time-consuming. Our solution, the “OLAP-XML Federation System,” makes it possible to reference the fast changing data in XML format in OLAP queries without physical integration. In this paper, we introduce the novel query optimization techniques specialized for the federation system including a query o...
متن کاملXML-Extended OLAP Querying
The rapidly changing data requirements of today’s dynamic business environments are not handled well by current On-Line Analytical Processing (OLAP) systems. Physically integrating data from new sources into OLAP systems is a long and time-consuming process, making logical integration the better choice in many situations. The increasing use of Extended Markup Language (XML), e.g. in business-to...
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Whenever queries have to be evaluated on XML data streams or when the memory that is available to evaluate the XML data is relatively small compared to the document DOM based approaches that have to load and store large parts of the document in main memory will fail. In comparison, we present an approach to evaluate XPath queries on SAX streams that supports all axes of core XPath, including th...
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In the past few years, much attention has been paid to the study of semistructured data, i.e., data with irregular, possibly unstable, and rapidly changing structure, and, in particular, to the study of their best-known incarnation: XML. The growing interest toward XML leaded to the definition of many querying and manipulating tools, such as the standard query language XQuery [3]. Unlike SQL, X...
متن کاملA Physical Algebra for XML
We present a physical algebra for the manipulation of XML in a database. We show how to map logical algebra operators to this physical algebra. We also present several physical algebra identities that are useful for query optimization. This physical algebra is the basis for the implementation of the TIMBER native XML database system at the University of Michigan.
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ژورنال
عنوان ژورنال: Journal of Database Management
سال: 2006
ISSN: 1063-8016,1533-8010
DOI: 10.4018/jdm.2006040105