Robert Wrembel

Robert Wrembel is an assistant professor at the Poznañ University of Technology, Poland, and a lecturer at Oracle Poland. He received Ph.D. in computer science (databases) in 2001, and took part in four research projects on databases and four industrial projects in the field of information technologies. He has paid a number of visits to research and education centers, including the INRIA Paris-Rocquencourt, France, the Paris Dauphine University, France, the Klagenfurt University, Austria, and the Loyola University, USA. His research interests encompass data warehouse technologies – temporal, multiversion, object-relational – and object-oriented systems – views, data access optimization.

Publications

Schema Evolution in Multiversion Data Warehouses
Schema Evolution in Multiversion Data Warehouses
Waqas Ahmed, Esteban Zimányi, Alejandro A. Vaisman, Robert Wrembel. © 2021. 28 pages.
Data warehouses (DWs) evolve in both their content and schema due to changes of user requirements, business processes, or external sources to name a few. Although multiple...
A Temporal Multidimensional Model and OLAP Operators
A Temporal Multidimensional Model and OLAP Operators
Waqas Ahmed, Esteban Zimányi, Alejandro Ariel Vaisman, Robert Wrembel. © 2020. 32 pages.
Usually, data in data warehouses (DWs) are stored using the notion of the multidimensional (MD) model. Often, DWs change in content and structure due to several reasons, like...
On-Demand ELT Architecture for Right-Time BI: Extending the Vision
On-Demand ELT Architecture for Right-Time BI: Extending the Vision
Florian Waas, Robert Wrembel, Tobias Freudenreich, Maik Thiele, Christian Koncilia, Pedro Furtado. © 2013. 18 pages.
In a typical BI infrastructure, data, extracted from operational data sources, is transformed, cleansed, and loaded into a data warehouse by a periodic ETL process, typically...
On Handling the Evolution of External Data Sources in a Data Warehouse Architecture
On Handling the Evolution of External Data Sources in a Data Warehouse Architecture
Robert Wrembel. © 2011. 42 pages.
A data warehouse architecture (DWA) has been developed for the purpose of integrating data from multiple heterogeneous, distributed, and autonomous external data sources (EDSs)...
On Querying Data and Metadata in Multiversion Data Warehouse
On Querying Data and Metadata in Multiversion Data Warehouse
Wojciech Leja, Robert Wrembel, Robert Ziembicki. © 2010. 21 pages.
Methods of designing a data warehouse (DW) usually assume that its structure is static. In practice, however, a DW structure changes among others as the result of the evolution...
A Survey of Managing the Evolution of Data Warehouses
A Survey of Managing the Evolution of Data Warehouses
Robert Wrembel. © 2010. 35 pages.
Methods of designing a data warehouse (DW) usually assume that its structure is static. In practice, however, a DW structure changes among others as the result of the evolution...
A Survey of Managing the Evolution of Data Warehouses
A Survey of Managing the Evolution of Data Warehouses
Robert Wrembel. © 2009. 33 pages.
Methods of designing a data warehouse (DW) usually assume that its structure is static. In practice, however, a DW structure changes among others as the result of the evolution...
Data Warehouses and OLAP: Concepts, Architectures and Solutions
Data Warehouses and OLAP: Concepts, Architectures and Solutions
Robert Wrembel, Christian Koncilia. © 2007. 360 pages.
Data warehouses and online analytical processing (OLAP) are emerging key technologies for enterprise decision support systems. They provide sophisticated technologies from data...