[jira] [Comment Edited] (JENA-1769) Dataset#listNames slow for large TDB2 datasets

["Andy Seaborne (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/JENA-1769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16953792#comment-16953792 ] 

Andy Seaborne edited comment on JENA-1769 at 10/18/19 8:17 AM:
---------------------------------------------------------------

[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)


was (Author: andy.seaborne):
[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.



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