Size bounds for factorised representations of query results

D Olteanu, J Závodný - ACM Transactions on Database Systems (TODS …, 2015 - dl.acm.org
We study two succinct representation systems for relational data based on relational algebra
expressions with unions, Cartesian products, and singleton relations: f-representations …

Incomplete data management: a survey

X Miao, Y Gao, S Guo, W Liu - Frontiers of Computer Science, 2018 - Springer
Incomplete data accompanies our life processes and covers almost all fields of scientific
studies, as a result of delivery failure, no power of battery, accidental loss, etc. However, how …

Factorized databases

D Olteanu, M Schleich - ACM SIGMOD Record, 2016 - dl.acm.org
This paper overviews factorized databases and their application to machine learning. The
key observation underlying this work is that state-of-the-art relational query processing …

Semantics and evaluation of top-k queries in probabilistic databases

X Zhang, J Chomicki - Distributed and parallel databases, 2009 - Springer
We study here fundamental issues involved in top-k query evaluation in probabilistic
databases. We consider simple probabilistic databases in which probabilities are associated …

Aggregation and ordering in factorised databases

N Bakibayev, T Kočiský, D Olteanu… - arxiv preprint arxiv …, 2013 - arxiv.org
A common approach to data analysis involves understanding and manipulating succinct
representations of data. In earlier work, we put forward a succinct representation system for …

Sprout: Lazy vs. eager query plans for tuple-independent probabilistic databases

D Olteanu, J Huang, C Koch - 2009 IEEE 25th International …, 2009 - ieeexplore.ieee.org
A paramount challenge in probabilistic databases is the scalable computation of
confidences of tuples in query results. This paper introduces an efficient secondary-storage …

Incremental view maintenance with triple lock factorization benefits

M Nikolic, D Olteanu - Proceedings of the 2018 International Conference …, 2018 - dl.acm.org
We introduce F-IVM, a unified incremental view maintenance (IVM) approach for a variety of
tasks, including gradient computation for learning linear regression models over joins, matrix …

FDB: A query engine for factorised relational databases

N Bakibayev, D Olteanu, J Závodný - arxiv preprint arxiv:1203.2672, 2012 - arxiv.org
Factorised databases are relational databases that use compact factorised representations
at the physical layer to reduce data redundancy and boost query performance. This paper …

Approximate confidence computation in probabilistic databases

D Olteanu, J Huang, C Koch - 2010 IEEE 26th International …, 2010 - ieeexplore.ieee.org
This paper introduces a deterministic approximation algorithm with error guarantees for
computing the probability of propositional formulas over discrete random variables. The …

Factorised representations of query results: size bounds and readability

D Olteanu, J Závodný - … of the 15th International Conference on …, 2012 - dl.acm.org
We introduce a representation system for relational data based on algebraic factorisation
using distributivity of product over union and commutativity of product and union. We give …