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https://issues.apache.org/jira/browse/JENA-2204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17453968#comment-17453968
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Andy Seaborne edited comment on JENA-2204 at 12/6/21, 11:58 AM:
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The data is broken.
There are *13946* named graphs.
And *one* subject.
Every nquads line starts {{{}<raw>{}}}.
{noformat}
<raw> <http://www.Department12.University0.edu/GraduateStudent9>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#ResearchAssistant> .
{noformat}
{noformat}
tdb2.tdbquery --loc DBX 'SELECT (count(*) AS ?C) { GRAPH ?g { } }'
{noformat}
So it looks like you meant to use the default graph.
Fixed data, it's 16M in the default graph.
_x9 smaller_
> For 50K triples from LUBM dataset , Jena shows 330 MB while RDF4J shows 4.2 MB
Jena is 7.4M.
was (Author: andy.seaborne):
The data is broken.
There are *13946* named graphs.
And *one* subject.
Every nquads line starts {{{}<raw>{}}}.
{noformat}
<raw> <http://www.Department12.University0.edu/GraduateStudent9>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#ResearchAssistant> .
{noformat}
{noformat}
tdb2.tdbquery --loc DBX 'SELECT (count(*) AS ?C) { GRAPH ?g { } }'
{noformat}
So it looks like you meant to use the default graph.
Fixed data, it's 16M in the default graph.
_x9 smaller_
> Storage required by TDB2 is much higher than TDB1, How to Fix ?
> ---------------------------------------------------------------
>
> Key: JENA-2204
> URL: https://issues.apache.org/jira/browse/JENA-2204
> Project: Apache Jena
> Issue Type: Question
> Reporter: Hemant Tiwari
> Priority: Minor
> Attachments: LUBM-TDB2-Data.7z
>
>
> The storage required by TDB2 is much higher than TDB1
> For 100k statements - TDB1 takes about 90 MB, while TDB2 is taking ~ close to
> 1 GB.
> Why is there such a difference and is there any solution available to reduce
> the storage size?
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