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Flash-Aware Storage of the Column Oriented Databases
Fundamenta Informaticae, 2020Solid state disks become the very popular storage devices. Nonetheless, their architecture based on flash memory has some limitations. They suffer from poor random write performance, as the flash memory blocks must be erased before write. Nowadays, among many database models, the column-oriented databases have attracted the attention.
Macyna, Wojciech, Kukowski, Michal
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Column-Oriented DWMS Metadata Management Strategy
2010 International Conference on Computational Intelligence and Software Engineering, 2010Metadata management is an important component in data warehouse. In the column-oriented system, data is stored by columns while metadata is still accessed in the way of rows, so it is a problem to convert columns into rows efficiently. Studies have shown that the strategy of converting column into row is an important issue for the performance of column
Sihui Han, Li Sun
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Hybrid Column/Row-Oriented DBMS
2015The rapid growth of data volumes which store the increasing amount of information makes the necessity of searching for the effective methods of data storing and processing. Some researches on this field recommend changing the row data organization that is classical for DBMS to the columnar one and/or the in-memory approach usage.
Małgorzata Bach, Aleksandra Werner
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Column-Oriented Database Acceleration Using FPGAs
2019 IEEE 35th International Conference on Data Engineering (ICDE), 2019The in-memory system is promising for improving the performance of column-oriented database management systems (DBMSs). However, in comparison with NAND-flash-based solid-state drives (SSDs), dynamic random access memories (DRAMs) are around ten times more expensive and tens to thousands of times more energy inefficient.
Satoru Watanabe +4 more
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Orientation Columns from First Principles
1993The input to primary visual cortex is embedded in a high dimensional feature space whose dimensions include position in visual space, preferred orientation, ocular dominance etc. Since all cells in a column with axis perpendicular to the cortical surface have approximately the same properties [4], this space is effectively mapped on a two-dimensional ...
Ernst Niebur, Florentin Wörgötter
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Geometry of orientation columns in the visual cortex
Biological Cybernetics, 1979The optimal direction of lines in the visual field to which neurons in the visual cortex respond changes in a regular way when the recording electrode progresses tangentially through the cortex (Hubel and Wiesel, 1962). It is possible to reconstruct the field of orientations from long, sometimes multiple parallel penetrations (Hubel and Wiesel, 1974 ...
Braitenberg, V., Braitenberg, C.
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Feature Detectors and Orientation Columns
1991In this concluding chapter we shall try to make our essay less extravagant by relating it to more familiar concepts of cortical physiology. We intend to show that the statistical nature of cortical “wiring” proposed by us is well compatible with known facts from visual physiology (Hubel and Wiesel 1977), even if the very same facts have sometimes been ...
Valentino Braitenberg, Almut Schüz
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Column-Oriented Datalog Materialization for Large Knowledge Graphs
Proceedings of the AAAI Conference on Artificial Intelligence, 2016The evaluation of Datalog rules over large Knowledge Graphs (KGs) is essential for many applications. In this paper, we present a new method of materializing Datalog inferences, which combines a column-based memory layout with novel optimization methods that avoid redundant inferences at runtime.
Urbani, Jacopo +2 more
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Anatomical demonstration of orientation columns in macaque monkey
Journal of Comparative Neurology, 1978AbstractIn the macaque monkey striate (primary visual) cortex, the grouping of cells into ocular dominance and orientation columns leads to the prediction of highly specific spatial patterns of cellular activity in response to stimulation by lines through one or both eyes.
D H, Hubel, T N, Wiesel, M P, Stryker
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Virtualization and Column-Oriented Database Systems
2011Cloud and grid computing requires new data management paradigms, new data models, systems, and capabilities. Data-intensive systems such as column-oriented database systems will play an important role in cloud data management besides traditional databases.
Ilia Petrov +2 more
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