Hi Vishesh, There are a number of ways to perform SPARUL insert/update/delete operations with Virtuoso in the tips and tricks guide, at:
http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/VirtTipsAndTricksGuide#RDF%20data%20management
The key being to perform such operations with log_mode(3) to set transaction
logging mode to autocommit, particularly when performing a large number of such
operations which would otherwise consume large amounts of memory affecting the
performance of the system significantly ...
Best Regards
Hugh Williams
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On 7 Dec 2012, at 10:23, Vishesh Handa wrote:
> Hey everyone
>
> In our install, we have a case where we need to move triples from one graph
> to another. This is a fairly regular operation, and we would like it to be as
> fast as possible.
>
> The current approach that we are using is -
>
> SQL> sparql delete from <graph> { triples } where { triples }
> SQL> sparql insert into <newGraph> { triples }
>
> Since all the triples are quite often not in the same graph. We land up
> executing the delete statement a number of times.
>
> Is there any better way of doing this?
>
> I experimented with directly updating the SQL tables. Though I do not think
> we should be doing this as the virtuoso documentation [1] explicitly asks
> clients not to do so. Apparently the internal caches are not updated.
>
> Otherwise we could do something like this -
> for each triple -
> SQL> update DB.DBA.RDF_QUAD set G = iri_to_id('newGraph', 0) where S =
> iri_to_id( 'subject', 0 ) and P = iri_to_id('predicate', 0) and O =
> iri_to_id('object', 0);
>
> This might result in fewer commands than our current approach.
>
> [1] http://docs.openlinksw.com/virtuoso/rdfdatarepresentation.html
>
> --
> Vishesh Handa
>
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