delete rdf graph data

Question

I'm new to sparql. Can anyone tell me how I can delete an rdf graph data (eg: http://mylocalhost.com/owl/file.owl) in virtuoso. Following is how I created it:

db.dba.rdf_load_rdfxml_mt(file_to_string_output('/data/file.owl'), '', 'http://example.com/file.owl');

I did the sparql clear graph <uri> and sparql drop graph <uri>, but didn't work. Many thanks in advance

Please see the following tip on differences between create, drop, clear & delete graph methods in Virtuoso: http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/VirtTipsAndTricksGuideCreateGraph — hwilliams, Jul 22 '11 at 01:19

score 2 · Answer 1 · answered Apr 09 '15 at 00:31

Notice that clearing the graphs does not necessarily free up space. You will notice that the main virtuoso.db file size may remain the same after the deletion.

If you need to delete all the RDF triples (start a clear database), you can delete (or rename) the db folder that virtuoso operates on.

Restart virtuoso, and you will notice that it will create a clean database.

It is a hacky way, but works well!

score 2 · Accepted Answer · answered Jul 18 '11 at 19:48

2

Note that CLEAR GRAPH, and DROP GRAPH are SPARQL Update operations, so you might need to use a different method, or endpoint, I'm not familiar with how Virtuoso works.

answered Jul 18 '11 at 19:48

Steve Harris

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Thanks Steve. I ended up clearing and reloading all the rdf triples. – DGT Jul 19 '11 at 17:44

delete rdf graph data

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