Titlebook: New Trends in Databases and Information Systems; ADBIS 2019 Short Pap Tatjana Welzer,Johann Eder,Aida Kami?ali? Latifi? Conference proceedi

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Conference proceedings 2019atabases and Information Systems, ADBIS 2019, held in Bled, Slovenia, in September 2019..The 19 short research papers and the 5 doctoral consortium papers were carefully reviewed and selected from 103 submissions, and the 31 workshop papers were selected out of 67 submitted papers. The papers are or

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Modelling and Querying Star and Snowflake Warehouses Using Graph DatabasesA collection of typical OLAP queries is used to compare both implementations. The results reported here show that in ten out of thirteen queries tested, the graph implementation outperforms the relational one, in ratios that go from 1.3 to 26 times faster, and performs similarly to the relational implementation in the three remaining cases.

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Distributed Computation of Top-, Degrees in Hidden Bipartite Graphsvering the top-. nodes of a hidden bipartite graph with the highest degrees, by using distributed algorithms. In particular, we use Apache Spark and provide experimental results showing that significant performance improvements are achieved in comparison to existing centralized approaches.

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Automatically Configuring Parallelism for Hybrid Layoutsdecides the number of tasks based on the data being read. The proposed cost-model can be utilized in a multi-objective approach to decide both the number of tasks and number of machines for execution.

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Panagiotis Kostoglou,Apostolos N. Papadopoulos,Yannis Manolopouloserent concerns related to system construction, functional and non-functional characteristics, and the development environment..Based on these observations, we propose several different representation levels for software architecture. We briefly describe issues arising from multiple representations o

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