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Ruben Verborgh

Optimizing Storage of RDF Archives using Bidirectional Delta Chains

by Ruben Taelman, Thibault Mahieu, Martin Vanbrabant, and Ruben Verborgh

Linked Open Datasets on the Web that are published as RDF can evolve over time. There is a need to be able to store such evolving RDF datasets, and query across their versions. Different storage strategies are available for managing such versioned datasets, each being efficient for specific types of versioned queries. In recent work, a hybrid storage strategy has been introduced that combines these different strategies to lead to more efficient query execution for all versioned query types at the cost of increased ingestion time. While this trade-off is beneficial in the context of Web querying, it suffers from exponential ingestion times in terms of the number of versions, which becomes problematic for RDF datasets with many versions. As such, there is a need for an improved storage strategy that scales better in terms of ingestion time for many versions. We have designed, implemented, and evaluated a change to the hybrid storage strategy where we make use of a bidirectional delta chain instead of the default unidirectional delta chain. In this article, we introduce a concrete architecture for this change, together with accompanying ingestion and querying algorithms. Experimental results from our implementation show that the ingestion time is significantly reduced. As an additional benefit, this change also leads to lower total storage size and even improved query execution performance in some cases. This work shows that modifying the structure of delta chains within the hybrid storage strategy can be highly beneficial for RDF archives. In future work, other modifications to this delta chain structure deserve to be investigated, to further improve the scalability of ingestion and querying of datasets with many versions.

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To be published in 2021 in Semantic Web Journal.

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Cite this article easily using its BibTeX entry:

@article{taelman_swj_2021,
  title = {Optimizing Storage of {RDF} Archives using Bidirectional Delta Chains},
  author = {Taelman, Ruben and Mahieu, Thibault and Vanbrabant, Martin and Verborgh, Ruben},
  journal = {Semantic Web Journal},
  year = 2021,
  url = {http://semantic-web-journal.net/system/files/swj2881.pdf},
}

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IEEE
R. Taelman, T. Mahieu, M. Vanbrabant, and R. Verborgh, “Optimizing Storage of RDF Archives using Bidirectional Delta Chains,” Semantic Web Journal, 2021. Accepted for publication.
ACM
Ruben Taelman, Thibault Mahieu, Martin Vanbrabant, and Ruben Verborgh. 2021. Optimizing Storage of RDF Archives using Bidirectional Delta Chains. Semantic Web Journal (2021). Accepted for publication.
LNCS
Taelman, R., Mahieu, T., Vanbrabant, M., Verborgh, R.: Optimizing Storage of RDF Archives using Bidirectional Delta Chains. Semantic Web Journal. (2021). Accepted for publication.
APA
Taelman, R., Mahieu, T., Vanbrabant, M., & Verborgh, R. (2021). Optimizing Storage of RDF Archives using Bidirectional Delta Chains. Semantic Web Journal. Accepted for publication.
MLA
Taelman, Ruben, et al. “Optimizing Storage of RDF Archives Using Bidirectional Delta Chains.” Semantic Web Journal, 2021. Accepted for publication.

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