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<pre>
                                  Preface
We, the chairs, are happy to present this volume of the proceedings of the 2021
edition of the VLDB Ph.D. Workshop. The workshop was co-located with the 47th
International Conference on Very Large Database (VLDB 2021) in Copenhagen and
was held in a hybrid on-line and in-person setup on August 16, 2021.

We assembled the technical program to give Ph.D. students an opportunity to
present their research ideas in a premier international research venue. The resulting
program, consisting of 12 papers accepted out of the 18 submissions we received,
presents a representative sample of relevant topics in database research. It included
contributions from young researchers from America, Asia, and Europe.

This year’s program also included a keynote talk by Tim Kraska (MIT). The keynote
provided guidance to Ph.D. students on successful strategies for pursuing a career
in research and discussed novel issues and challenges in machine learning in and
for database systems.

Due to the pandemic situation, only three of the 12 Ph.D. students were able to
attend the conference and workshop in person. To accommodate speakers in their
time zones, we split the schedule into virtual and local sessions. Additionally, we
offered two forms of mentorship. We generated a mentor-mentee mapping between
authors and PC members for individual feedback sessions based on the submitted
paper and review. We further connected the attendees with well established
members of the VLDB community for general questions about research and the
community.

We thank Felix Naumann and Luna Dong, the VLDB 2021 PC chairs, and Pinar
Tözün and Philippe Bonnet, the general chairs, ​who entrusted us with this role. We
also acknowledge the great support of the whole local and technical organizing
team. Finally, we thank the workshop program committee, who did a great job
evaluating the papers and writing constructive feedback for the authors.

We believe the event gave Ph.D. students an excellent opportunity to share and
exchange research ideas with experienced researchers and become members of the
friendly and welcoming VLDB community. We wish all participants the very best for
their research!

The VLDB 2021 Ph.D. Workshop Chairs
Philip Bernstein, Microsoft Research
Tilmann Rabl, Hasso Plattner Institute, University of Potsdam
                      Program Committee
PC Chairs
Philip Bernstein, Microsoft Research
Tilmann Rabl, Hasso Plattner Institute, University of Potsdam

Program Committee Members
Alessandro Margara, Politecnico di Milano
Boris Glavic, IIT Chicago
Ce Zhang, ETH Zurich
Chen Xu, East China Normal University
Fatemeh Nargesian, University of Rochester
Hannes Mühleisen, CWI
Jana Giceva, TU Munich
Jaroslaw Szlichta, Ontario Tech University
Kaiwen Zhang, ETS Montreal
Matthias Boehm, TU Graz
Oliver Kennedy, University of Buffalo
Raul Castro Fernandez, University of Chicago
Sebastian Schelter, University of Amsterdam
Yogesh Simmhan, IISc Bangalore

Community Mentors
Angela Bonifati, Lyon 1 University
Christopher Jermaine, Rice University
Divesh Srivastava, AT&T
Felix Naumann, HPI
Goetz Graefe, Google
Marcello Arenas, PUC Chile
Norman Paton, Manchester University
Peter Pietzuch, Imperial College
Tim Kraska, MIT
Timos Sellis, Swinburne
Thomas Neumann, TU Munich
Volker Markl, TU Berlin

</pre>