The LNCS journal Transactions on Large-Scale Data- and
Knowledge-Centered Systems focuses on data management, knowledge
discovery, and knowledge processing, which are core and hot topics in
computer science. Since the 1990s, the Internet has become the main
driving force behind application development in all domains. An increase
in the demand for resource sharing (e.g., computing resources, services,
metadata, data sources) across different sites connected through
networks has led to an evolution of data- and knowledge-management
systems from centralized systems to decentralized systems enabling
large-scale distributed applications providing high scalability.
This, the 44th issue of Transactions on Large-Scale Data- and
Knowledge-Centered Systems, contains six fully revised and extended
papers selected from the 35th conference on Data Management -
Principles, Technologies and Applications, BDA 2019. The topics covered
include big data, graph data streams, workflow execution in the cloud,
privacy in crowdsourcing, secure distributed computing, machine
learning, and data mining for recommendation systems.