Proceedings of the 33rd ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems

This volume contains the proceedings of the thirty-third ACM SIGMOD-SIGACT-SIGART Symposium on Principles of Database Systems (PODS 2014), held in Snowbird, Utah, USA, on June 22-25, 2014, in conjunction with the 2014 ACM SIGMOD International Conference on Management of Data. Associated with PODS'14 was a workshop on Big Uncertain Data. The proceedings include papers based on the keynote address by Leonid Libkin (University of Edinburgh), two invited tutorials by Peter J. Haas (IBM Almaden) and Benny Kimelfeld (LogicBlox), and 22 contributions that were selected by the program committee for presentation at the symposium. The contributed papers were selected from 67 submissions. Most of the 22 accepted papers are extended abstracts. While all submissions have been reviewed by at least three program committee members, they have not been formally refereed. It is expected that much of the research described in these papers will be published in detail in scientific journals. An important and pleasant task for the program committee was the selection of the PODS 2014 Best Paper Award. The committee selected the paper "Weaker Forms of Monotonicity for Declarative Networking: a more fine-grained answer to the CALM-conjecture" by Tom J Ameloot, Bas Ketsman, Frank Neven and Daniel Zinn. On behalf of the committee, I would like to extend my sincere congratulations to the authors. Since 2008, PODS gives the ACM PODS Alberto O. Mendelzon Test-of-Time Award to a paper or a small number of papers published in the PODS proceedings ten years prior that had the most impact over the intervening decade. This year's committee, consisting of Wenfei Fan (chair), Floris Geerts, and Dan Suciu, selected the following two papers: "Composing Schema Mappings: Second-Order Dependencies to the Rescue" by Ronald Fagin, Phokion G. Kolaitis, Lucian Popa, and Wang Chiew Tan, "Foundations of Semantic Web Databases" by Claudio Gutierrez, Carlos A. Hurtado, and Alberto O. Mendelzon.