Hi Hasan, See the following tech note tip which details issues deleting large graphs in Virtuoso and how to avoid them:
http://virtuoso.openlinksw.com/dataspace/doc/dav/wiki/Main/VirtTipsAndTricksGuideDeleteLargeGraphs
Best Regards
Hugh Williams
Professional Services
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> On 30 May 2016, at 18:22, S.M.Shamimul Hasan <shamimul.ha...@gmail.com> wrote:
>
> Hello,
>
> I am using Virtuoso (7.1.0). It is installed on a server machine. I am trying
> to remove a large RDF graph from my Virtuoso. It contains 2,590,994,053
> triples. I was trying to delete the graph with the following command.
>
> SPARQL DROP SILENT GRAPH <http://ndssl.bi.vt.edu/chicago/
> <http://ndssl.bi.vt.edu/chicago/>>
>
> However after running for a long time, Virtuoso is giving me following error.
>
> *** Error 08S01: [Virtuoso Driver]CL065: Lost connection to server at
> line 6 of Top-Level:SPARQL DROP SILENT GRAPH
> <http://ndssl.bi.vt.edu/chicago/ <http://ndssl.bi.vt.edu/chicago/>>
>
> This delete command down my Virtuoso server as well. I also try with SPARQL
> "CLEAR" command. After running for a long time, it also terminates.
>
> BTW I have increase memory size to 128 GB and MaxCheckpointRemap. I have
> used following values. However, it does not work.
>
> NumberOfBuffers = 10900000
> MaxDirtyBuffers = 8000000
> MaxCheckpointRemap = 650000000
>
>
> Please let me know how can I remove this large graph from my Virtuoso triple
> store. I have some other graphs in Virtuoso as well. I do not want to remove
> those.
>
> Thank you.
>
> Regards,
> S.M.Shamimul Hasan
>
> ------------------------------------------------------------------------------
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