Re: No Improvement In Performance with indexing in Jena Fuseki

[Andy Seaborne]

Hi - attachments of configuration and data didn't make it (to me at least).

On 04/01/2021 04:56, Deepali Singhavi wrote:

Hi,

I am trying to implement indexing for Fuseki using Lucene/ElasticSearch using an assembler configuration file (attaching file for reference) but there is no improvement in performance (performance without index is better than with index).

I am using sample data from *films.ttl* file.

*Sample Query *
PREFIX text: <http://jena.apache.org/text# <http://jena.apache.org/text#>>

PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema# <http://www.w3.org/2000/01/rdf-schema#>>

select ?subject ?object
WHERE {
# Without Index
#?subject rdfs:label ?object .
#FILTER contains(?object,"City")
#With Index
?subject text:query (rdfs:label "city").
?subject rdfs:label ?object .
}

*Performance:*

No of Triples

        

No of Runs

        

Without Index

        

Lucene Index

        

ElasticSearch Index

6918

        

1

        

16ms

        

18ms

        

19ms

2

        

29ms

        

32ms

        

32ms

3

        

22ms

        

23ms

        

21ms

4

        

22ms

        

14ms

        

53ms

5

        

15ms

        

19ms

        

18ms

Please let me know if any other information is required from my side and please suggest how I can improve performance.

Regards,
Deepali