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Rachel Pottinger, Department of Computer Science
University of British Columbia

Users are faced with an increasing onslaught of data, whether it's in their choices of movies to watch, assimilating data from multiple sources, or finding information relevant to their lives on open data registries.

Thursday, May 10, 2018 2:00 pm - 2:00 pm EDT (GMT -04:00)

DSG Seminar Series • Next Generation Indexes For Big Data Engineering

Daniel Lemire
Université Télug

Maximizing performance in data engineering is a daunting challenge. We present some of our work on designing faster indexes, with a particular emphasis on compressed indexes. Some of our prior work includes (1) Roaring indexes which are part of multiple big-data systems such as Spark, Hive, Druid, Atlas, Pinot, Kylin, (2) EWAH indexes are part of Git (GitHub) and included in major Linux distributions.

Friday, May 11, 2018 1:30 pm - 1:30 pm EDT (GMT -04:00)

Seminar • RAMP: RDMA Migration Platform

Babar Naveed Memon, Master’s candidate
David R. Cheriton School of Computer Science

Remote Direct Memory Access (RDMA) can be used to implement a shared storage abstraction or a shared nothing abstraction for distributed applications. We argue that the shared storage abstraction is an overkill for loosely coupled applications and that the shared nothing abstraction does not leverage all the benefits of RDMA.

Wednesday, May 16, 2018 1:00 pm - 1:00 pm EDT (GMT -04:00)

MMATH Thesis Presentation • Math Information Retrieval using a Text Search Engine

Dallas Fraser, Master’s candidate
David R. Cheriton School of Computer Science

Combining text and mathematics when searching in a corpus with extensive mathematical notation remains an open problem. Recent results for math information retrieval systems on the math and text retrieval task at NTCIR-12, for example, show room for improvement, even though formula retrieval appears to be fairly successful.

Torben Bach Pedersen, Professor of Computer Science
Aalborg University, Denmark

Data collected from new sources such as sensors and smart devices is large, fast, and often complex. There is a universal wish to perform multidimensional OLAP-style analytics on such data, i.e., to turn it into “Big Multidimensional Data”. Supporting this is a multi-stage journey, requiring new tools and systems, and forming a new, extended data cycle with models as a key concept.

Monday, July 30, 2018 2:00 pm - 2:00 pm EDT (GMT -04:00)

DSG Seminar Series • Data Models from Traditional Databases to NoSQL Systems

Paolo Atzeni, Database Professor and Head of the Department of Engineering
Università Roma Tre

NoSQL systems have gained their popularity for many reasons, including the flexibility they provide with modeling, which tries to relax the rigidity provided by the relational model and by the other structured models.

Wednesday, November 14, 2018 12:15 pm - 12:15 pm EST (GMT -05:00)

PhD Seminar • Evaluating Subgraph Queries With a Mix of Tradition and Modernity

Amine Mhedhbi, PhD candidate
David R. Cheriton School of Computer Science

We study the problem of optimizing subgraph queries (SQs) using the new worst-case optimal (WCO) join plans in Selinger-style cost-based optimizers. WCO plans evaluate SQs by matching one query vertex at a time using multiway intersections. The core problem in optimizing WCO plans is to pick an ordering of the query vertices to match.