1. 2nd International Workshop on Preservation of Evolving Big Data (DIACHRON 2016) 15 March 2015, Co-located with EDBT 2016, Bordeaux, France http://www.diachron-fp7.eu/2nd-diachron-workshop.html George Papastefanatos, ATHENA Research Center, Greece Stratis D. Viglas, University of Edinburgh, UK Vassilis Christophides, INRIA Paris & University of Crete, Greece

2. Motivation Big Data Open Data, Linked Data, Stream Data, …., * Data Evolution, Preservation, Quality

3. How do we manage the Evolution of Big data? Rapidly Produced & Evolving (high velocity) Highly Dynamic (semantics, structure) Decentralized evolution (vs Close-world Evolution)

4. How do we Preserve Evolving Big Data? Preservation of complex data objects (vs digital assets & web pages) Complex changes ( vs add-only archives ) What is meaningful to archive given the great volume – diachronic entities? Combine archive storage efficiency & query performance?

5. How do we assess the Quality of Big Data? If the underlying data is wrong, dirty, incomplete, inconsistent, obsolete... ? Capture provenance in highly curated data Handle Entity persistence & Data citation through time … More Q & A @ Panel Session

6. Stats 21 Program Committee members 8 papers submitted (7 short, 1 long) Greece, Germany, UK, France, Brazil, Japan 5 papers accepted (5 short) 3 reviews \ paper

7. 3 sessions Paper Presentation Session Keynote Session Panel Session

8. Papers presentation 1.Understanding Ontology Evolution Beyond Deltas, Georgia Troullinou, ICS- FORTH, Greece, Giannis Roussakis, ICS-FORTH, Greece, Haridimos Kondylakis, ICS-FORTH, Greece, Kostas Stefanidis, ICS-FORTH, Greece, Giorgos Flouris, ICS- FORTH, Greece 2.Biomedical Ontology Evolution in the EMBL-EBI Ontology Lookup Service, Olga Vrousgou, EMBL-EBI, UK, Tony Burdett, EMBL-EBI, UK, Simon Jupp, EMBL-EBI, UK, Helen Parkinson, EMBL-EBI, UK 3.Finding and Fixing Type Mismatches in the Evolution of Object-NoSQL Mappings, Stefanie Scherzinger, OTH Regensburg, Germany, Eduardo Cunha de Almeida, UFPR, Brazil, Thomas Cerqueus, University of Lyon, France, Leandro Batista de Almeida, UTFPR, Brazil, Pedro Holanda, UFPR, Brazil 4.EvoGen: a Generator for Synthetic Versioned RDF, Marios Meimaris, ATHENA Research Center, Greece 5.Towards Publish/Subscribe Functionality on Graphs, Lefteris Zervakis, University of the Peloponnese, Greece, Christos Tryfonopoulos, University of the Peloponnese, Greece, Vinay Setty, Max Planck Institute, Saarbrücken, Germany, Stephan Seufert, Max Planck Institute, Saarbrücken, Germany, Spiros Skiadopoulos, University of the Peloponnese, Greece

9. Keynote Francois Bancilhon (Data Publica) Collecting, managing and using enterprise information for B2B predictive marketing. Diachronicity issues and their possible solutions

10. Panel: Big Data Quality Moderators Vassilis Christophides (INRIA Paris & University of Crete, Greece) Mokrane Bouzeghoub (INS2I -CNRS, FR) Panelists Paolo Missier (University of Newcastle, UK) Norman Paton (University of Manchester, UK) Angela Bonifati (Université Claude Bernard Lyon 1, FR)

11. Diachron 2016 Program 8.45 - 9.00 Registration and Welcome 9.00 - 10.30 Research Session 10.30 - 11.00 Coffee Break 11.00-11.40 Keynote Session 11.45-12.30 Panel Session 12.30-End of Workshop - Lunch

12. Papers Presentation 15’ presentation 2’ Q&A