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https://issues.apache.org/jira/browse/JENA-1769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16954383#comment-16954383
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ASF subversion and git services commented on JENA-1769:
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Commit 4d31edf7c913f72f2d94a1b737810c4ef1174d01 in jena's branch 
refs/heads/master from Andy Seaborne
[ https://gitbox.apache.org/repos/asf?p=jena.git;h=4d31edf ]

Merge pull request #619 from afs/jena-1769_list-graphs

JENA-1769: TDB2-specific code for listGraphNodes

> 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: 20m
>  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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