This two volume set LNCS 9642 and LNCS 9643 constitutes
the refereed proceedings of the 21st International Conference on Database
Systems for Advanced Applications, DASFAA 2016, held in Dallas, TX, USA, in
April 2016.





The 61 full papers presented were carefully reviewed and
selected from a total of 183 submissions. The papers cover the following
topics: crowdsourcing, data quality, entity identification, data mining and
machine learning, recommendation, semantics computing and knowledge base,
textual data, social networks, complex queries, similarity computing, graph
databases, and miscellaneous, advanced applications.