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Columns of dimension tables that are frequently restricted in queries on a star schema database are materialized into the fact table by various means, depending on database product features. This makes it possible to create a multidimensional partitioning on the fact table, so that many queries restricting columns in hierarchies of the columns materialized will retrieve only a small number of cells...
As mainstream data warehouses are growing into the multi-terabyte range, adequate performance for decision support queries remains challenging for database query processors. Proper choice of query plan is essential in data warehouses where fact tables often store billions of rows. This paper discusses query optimization and execution strategies that Microsoft SQL Server employs for decision support...
Traditionally, DBMSs are shipped with hundreds of configuration parameters. Since the database performance highly depends on the appropriate settings of the configuration parameters, DBAs spend a lot of their time and effort to find the best parameter values for tuning the performance of the application of interest. In many cases, they rely on their experience and some rules of thumbs. However, time...
Radio frequency identification (RFID) technology is an excellent substitute for barcodes in industry. However, the management of a large amount of RFID data, together with complicated relationships between data, in the context of responding to different kinds of queries is not well supported by traditional databases. Therefore, (1) an event-based model for managing data and (2) an algorithm for responding...
Statistical graphs are ubiquitous mechanisms for data visualization such that most, if not all, enterprises communicate information through them. However, many graphs are stored as unstructured images or proprietary binary objects, making them difficult to work with beyond the reports in which they are embedded. While graphs can be mapped to more common XML representations, these lack expressive semantics...
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