The DB group meets Wednesday afternoons at 2:30pm. The list below gives the times and locations of upcoming meetings. Each meeting lasts for an hour and features either a local speaker or, on Seminar days, an invited outside speaker. Everyone is welcome to attend.
| DB Meeting: | Wednesday May 2, 2:30pm, DC 1331 |
| Speaker: | Tamer Özsu |
| Title: | RDF Data Management Using Graph Algorithms |
| Abstract: | Resource Description Framework (RDF) has been proposed for modeling Web objects as part of developing the "semantic web". It has also gained attention as a way to accomplish web data integration. As the volume of RDF data has increased, interesting data management issues have arisen. In this talk I will discuss some of our recent work in this area, focusing on two results: answering SPARQL queries over RDF graphs, and processing aggregate SPARQL queries. The first problem focuses on evaluating SPARQL queries with wildcards over an RDF graph that sees frequent updates. We propose an approach that maps both the RDF data and the SPARQL query into graphs and converts the query evaluation problem to one of subgraph matching. In order to speed up query processing, we propose an indexing mechanism and pruning rules to reduce the search space. The second problem addresses the processing of aggregation queries over large RDF data sets. We propose a processing approach that partitions aggregate queries into smaller parts (called star queries), processes these efficiently, and joins the results of star queries to obtain more general results. We develop indexes to assist in executing star queries and to facilitate joining their results. |
| DB Meeting: | Wednesday May 9, 2:30pm, MC 5136 |
| Speaker: | Lukasz Golab |
| Title: | Data Warehouse Quality |
| Abstract: | In this talk, I'll present a book chapter on data warehouse quality that will appear in the Handbook of Research and Practice in Data Quality. I'll discuss data quality metrics such as freshness, currency, completeness and consistency, and approaches to improving data quality such as error detection, error correction and distributed data quality monitoring. This is work in progress, so comments are welcome! |
| DB Meeting: | Wednesday May 30, 2:30pm, DC 3313 |
| Speaker: | Ashraf Aboulnaga |
| Title: | Defining a Big Data Research Agenda for Waterloo |
| Abstract: |
There is currently a lot of interest in Big Data as a research area. From
30,000 feet, the concept is clear: we have data that is big and useful and
we need to make sense of it. However, if we zoom in and try to define what
it means to do research on Big Data, the picture becomes fuzzy. One has a
hard time defining a crisp research agenda in this area.
In this meeting I will moderate an open discussion among the attendees about Big Data research, with the goal of reaching a better understanding of this area and possibly finding common ground for collaborative research projects in Waterloo. |
| DB Meeting: | Wednesday June 6, 2:30pm, DC 1331 |
| Speaker: | Jeff Pound |
| Title: | TBD |
| Abstract: |
| DB Meeting: | Wednesday June 13, 2:30pm, DC 1331 |
| Speaker: | Gunes Aluc |
| Title: | |
| Abstract: |
| DB Meeting: | Wednesday June 20, 2:30pm, DC 1331 |
| Speaker: | Khuzaima Daudjee |
| Title: | |
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| DB Seminar: | Wednesday June 27, 2:30pm, DC 1302 | |
| Speaker: | TBD | |
| Title: | TBD |
| DB Meeting: | Wednesday July 11, 2:30pm, DC 1331 |
| Speaker: | Xin Liu |
| Title: | |
| Abstract: |
| DB Meeting: | Wednesday July 18, 2:30pm, DC 1331 |
| Speaker: | David Toman |
| Title: | TBD |
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| DB Meeting: | Wednesday July 25, 2:30pm, DC 1331 |
| Speaker: | Peter Bumbulis |
| Title: | TBD |
| Abstract: |
| DB Meeting: | Wednesday August 1, 2:30pm, DC 1331 |
| Speaker: | Cătălin Avram |
| Title: | TBD |
| Abstract: |
Database Research Group
David R. Cheriton School of Computer Science
University of Waterloo
Waterloo, Ontario, Canada N2L 3G1
Tel: 519-888-4567
Fax: 519-885-1208
Contact | Feedback: db-webmaster@cs.uwaterloo.ca | Database Research Group
Last modified: Tuesday, 15-May-2012 13:21:55 EDT
