Substring Filtering for Low-Cost Linked Data Interfaces

author: Joachim Van Herwegen, Multimedia Lab, Ghent University
published: Nov. 10, 2015,   recorded: October 2015,   views: 1671


Related content

Report a problem or upload files

If you have found a problem with this lecture or would like to send us extra material, articles, exercises, etc., please use our ticket system to describe your request and upload the data.
Enter your e-mail into the 'Cc' field, and we will keep you updated with your request's status.
Lecture popularity: You need to login to cast your vote.
  Delicious Bibliography


Recently, Triple Pattern Fragments (tpfs) were introduced as a low-cost server-side interface when high numbers of clients need to evaluate sparql queries. Scalability is achieved by moving part of the query execution to the client, at the cost of elevated query times. Since the tpf interface purposely does not support complex constructs such as sparql filters, queries that use them need to be executed mostly on the client, resulting in long execution times. We therefore investigated the impact of adding a literal substring matching feature to the tpf interface, with the goal of improving query performance while maintaining low server cost. In this paper, we discuss the client/server setup and compare the performance of sparql queries on multiple implementations, including Elastic Search and case-insensitive fm-index. Our evaluations indicate that these improvements allow for faster query execution without significantly increasing the load on the server. Offering the substring feature on tpf servers allows users to obtain faster responses for filter-based sparql queries. Furthermore, substring matching can be used to support other filters such as complete regular expressions or range queries.

See Also:

Download slides icon Download slides: iswc2015_van_herwegen_substring_filtering_01.pdf (313.3┬áKB)

Help icon Streaming Video Help

Link this page

Would you like to put a link to this lecture on your homepage?
Go ahead! Copy the HTML snippet !

Write your own review or comment:

make sure you have javascript enabled or clear this field: