Ontario DataBase Day

December 12, 2025
The Ronald D. Schmeichel Building for Entrepreneurship and Innovation
Western University,
London, Ontario, Canada

The Ontario DataBase Day (OnDBD) is a one-day symposium that will bring together the database and data-focused research community of Ontario. OnDBD will provide an opportunity for junior and senior researchers from Ontario to present their recent work and learn about the wide variety of topics our research community is working on. Hence, OnDBD is an excellent opportunity to meet up with your local colleagues (including new students and faculty) and to foster new local research collaborations.

*Western University* (left) and the *venue* (right).

The third edition of OnDBD is organized by Mostafa Milani and Jelle Hellings and will be hosted by the Department of Computer Science at Western University.

Registration

Registration for OnDBD 2025 is now open! To register for the symposium, please click here. The Registration Fee is CAD$80 (+ tax).

Program Committee

Co-Chairs: Mostafa Milani (Western University) and Jelle Hellings (McMaster University).
Celine Sana (McMaster University).
Jongjun Park (McMaster University).
Kerem Akillioglu (University of Waterloo).
Nancy Kansal (McMaster University).
Nishttha Sharma (McMaster University).
Ramtin Sirjani (Western University).
Shufan Zhang (University of Waterloo).
Vladimir Zhurov (Western University).
Wongyu Kim (McMaster University).

Program

The high-level preliminary program looks as follows:

Start Time	End Time	Description
08:45	09:15	Registration Open
09:15	09:30	Welcome/Opening
09:30	10:45	Session 1 (4 talks)
10:45	11:15	Coffee break
11:15	12:30	Session 2 (4 talks)
12:30	13:30	Lunch
13:30	14:45	Session 3 (4 talks)
14:45	15:45	Poster presentation and Coffee break
15:45	17:00	Session 4 (4 talks)
17:00	18:30	Reception

Below is the break-down of the individual talks:

Start Time	End Time	Talk Information
09:30	09:48	An Interactive Tool for SPARQL Query Refinement Using Natural Language Explanations
		Xiangru Jian, Zhengyuan Dong,and M. Tamer Özsu, University of Waterloo
09:49	10:07	Bloom filter-aware Bottom-Up Cost Based Optimization
		Tim Zeyl, Qi Cheng, Reza Pournaghi, Jason Lam, Ben Wang, Calvin Wong, and Paul Larson, Huawei Canada
10:08	10:26	Sphinx: A Succinct Perfect Hash Index for x86
		Sajad Faghfoor Maghrebi and Niv Dayan, University of Toronto
10:27	10:45	Unveiling Intrinsic Graph Data Properties for Domain Adaptation
		Ruiyi Fang, Western University
11:15	11:33	Persistent Memory 𝑘-Core Decomposition
		Igor Jardim-Martins and Bin Guo, Trent University
11:34	11:52	SAP HANA Cloud: Modern Data Management Architecture for Data Lakehouse
		Daniel Farrar, SAP Labs Canada
11:53	12:11	Fast Stratified Sampling for Approximate Queries with Indexes
		Yunnan Yu, University at Buffalo
12:12	12:30	Efficient cost based rewrite in a bottom up optimizer
		Qi Cheng, Yang Sun, Weidong Yu, Yuanxi Chen, Weicheng Wang, Chong Chen, and Paul Larson, Huawei Canada
13:30	13:48	Optimizing Data Migration Using Machine Learning
		Aijun An, York University
13:49	14:07	Implementing High-Performance Resilient Data Management: What we Learned
		Jelle Hellings, Nancy Kansal, and Celine Sana, McMaster University
14:08	14:26	Parallel Oblivious Joins using Radix Partitioning
		Nafis Ahmed and Sujaya Maiyya, University of Waterloo
14:27	14:45	Space-Efficient Dynamic Filter Expansion
		Hyuhng Min Kim, University of Toronto
		Posters to be determined.
15:45	16:03	Building Skew Resistant Hash Tables
		Gunes Aluc, SAP Labs Canada
16:04	16:22	Improving Cloud Database Performance With Unified BUS
		Chong Chen, Jack Ng, Shu Lin, Jason Lam, and Danny Chen, Huawei Canada
16:23	16:41	Primary Key-Free Watermarking: A Robust Framework for Ownership Protection in Databases
		Xin Che, Qiqi Zhang, and Lingyang Chu, McMaster University
16:42	17:00	Diva: Dynamic Range Filter for Var-Length Keys and Queries
		Navid Eslami, University of Toronto

Parking Details

See Google Maps for details on nearby parking.

Details for Presenters

Presentations.: Each slot is 18 minutes---Count 15 minutes for your talk and 3 minutes for quick questions.
Posters.: The poster boards can accommodate posters of size 1.2m x 1.2m, e.g., an A0-sized poster will easily fit.
If you received a poster invitation and have not yet confirmed with us, then do so on time.

Contact

Please contact us at contact [at] ondbd.ca for further questions, clarifications, or issues.

Submission Guidelines (closed)

We invite proposals for presentations in all areas related to databases and data-focused research. Areas of interest include, but are not limited to:

Data storage, indexing, and querying;
Large-scale data, distributed data processing, and resilient data management;
Data mining, knowledge discovery, and machine learning;
Database benchmarking and performance;
Database theory, dependencies, and query semantics; and
Data science.

Contributions can cover published work or research in progress. Based on the submissions, we will make a selection of contributions that will be presented as a talk. In case of many submissions, we will favour presentations by new faculty and junior researchers.

Please submit your proposals for presentations before the deadline (October 15, 2025). Each proposal should consist of a one-page abstract (including references) based on this LaTeX template (example PDF). Each proposal should contain at-least:

A title for the presentation;
The name and affiliation of the presenter; and
A short description of the presentation.

Proposals for presentations can be submitted at the submission website.

Submission Deadline.: October 22, 2025 (extended deadline).
Notification.: ~~October 30, 2025~~ Early November.

OnDBD will have no printed proceedings. The one-page abstract of accepted proposals for presentations will be published on this website, e.g., as part of the program.

History

First edition (2023): The inaugural edition of OnDBD was organized by Jelle Hellings and held December 13, 2023 at McMaster University.
Second edition (2024): The second edition of OnDBD was organized by Sujaya Maiyya and held December 12, 2024 at Waterloo University.

Sponsors and Supporters

OnDBD 2025 is sponsored by SAP Canada and supported by Western University.

CMT Acknowledgment

The Microsoft CMT service was used for managing the peer-reviewing process for this conference. This service was provided for free by Microsoft and they bore all expenses, including costs for Azure cloud services as well as for software development and support.