Database Theory Columnâ Report on PODS 2009 Jianwen Su PODS 2009 PC Chair Department of Computer Science UC Santa Barbara su@cs.ucsb.edu The 28th edition of the ACM SIGMOD-SIGACT-SIGART Symposium on Principles of Databases (PODS) took place from June 29 to July 1, 2009, in Providence, Rhode Island. The symposium was organized jointly with the ACM SIGMOD International Conference on Management of Data (SIGMOD). PODS focuses on theoretical aspects of data management systems and techniques, and the co-location with SIGMOD stimulates interaction between theory-oriented and system-oriented research. The proceedings of PODS 2009 is published by ACM Press, and can also be found both on the SIGMOD website (http://www.sigmod.org), as well as in the ACM Digital Library (http: //www.acm.org/dl). The conference program included a keynote talk by Raghu Ramakrishnan, two invited tutorials by Leonid Libkin and by Lars Arge, and 26 contributed papers that were selected by the Program Committee from 97 submissions. Similar to past PODS conferences, most of the contributed papers are preliminary reports on work in progress, and many of them will probably appear in more polished and detailed form in scienti Âc journals. In his keynote talk, Raghu Ramakrishnan presented a new paradigm that models the
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