Proactive Policy for Efficiently Updating Join Views on Continuous Queries over Data Streams and Linked Data

Sejin Chun, Jooik Jung, Kyong Ho Lee

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Modern data analytic systems benefit from the fusion of streaming data and linked data distributed on the Web. Accessing the linked data at query time is prohibited as usual due to its expensive cost. To reduce the high cost, most of the database systems have used a materialized view (a view) that stores local copies of the data. However, views by conventional maintenance policies such as immediate, deferred, and periodic fail to achieve high accuracy of answers to queries on data streams and linked data. To cope with the limitations, we propose a maintenance policy that releases expensive jobs of copying the latest version of linked data into views at the idle time. In other words, we pre-fetch a portion of linked data in advance according to their update pattern and query evaluation semantics. Our multiple maintenance policies that take into account changes of linked data alleviate the degradation of performance at run-time. Using real-world datasets we report that the proposed method has a significant improvement in terms of the response time, compared to the state-of-the-art methods.

Original languageEnglish
Article number8737904
Pages (from-to)86226-86241
Number of pages16
JournalIEEE Access
Publication statusPublished - 2019

Bibliographical note

Funding Information:
This work was supported by the Korea Electric Power Corporation under Grant R18XA05.

Publisher Copyright:
© 2013 IEEE.

All Science Journal Classification (ASJC) codes

  • Computer Science(all)
  • Materials Science(all)
  • Engineering(all)


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