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Andy Seaborne commented on JENA-1769: ------------------------------------- [PR#619](https://github.com/apache/jena/pull/619) fixes this problem. I have found the range of performance is dependent on the shape of the data - [~dobrist], are you able to share the test data you have please? (send it to me offline, or send a link) > Dataset#listNames slow for large TDB2 datasets > ---------------------------------------------- > > Key: JENA-1769 > URL: https://issues.apache.org/jira/browse/JENA-1769 > Project: Apache Jena > Issue Type: Bug > Components: TDB2 > Affects Versions: Jena 3.13.0 > Reporter: Damien Obrist > Assignee: Andy Seaborne > Priority: Major > Labels: performance > Time Spent: 10m > Remaining Estimate: 0h > > With Jena 3.13.0, the running time of {{Dataset#listNames}} has increased > significantly for TDB2 datasets. > I have compared the running times for a sample TDB2 dataset containing > *1'000'000 triples*. I have observed a running time of *~270ms* with Jena > 3.12.0 and *~13.5s* with Jena 3.13.0. > We're using a dataset with many millions of triples and for our use case, the > running time has increased from seconds to minutes. -- This message was sent by Atlassian Jira (v8.3.4#803005)