Hi Quentin,
Sounds like there maybe a problem with the indexes on the RDF_QUAD table, so
you should.
1. Perform integrity check on the database with the command "backup
'/dev/null';"
2. Check the count of indexes on the RDF_QUAD table which should all be the
same:
select count(*) from RDF_QUAD table option (index RDF_QUAD)
select count(*) from RDF_QUAD table option (index RDF_QUAD_POGS)
select count(*) from RDF_QUAD table option (index RDF_QUAD_SP)
If you can provide a lcopy of the DB file it can be checked. ...
Best Regards
Hugh Williams
Professional Services
OpenLink Software, Inc. // http://www.openlinksw.com/
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Universal Data Access, Integration, and Management Technology Providers
On 21 Feb 2014, at 04:12, Quentin <quent...@clearbluewater.com.au> wrote:
> Hi Hugh,
>
> I hadn't, I'd forgotten the name of the audit functions. I ran the
> backup->null test described under database recovery and that gave no
> indication of a problem.
>
> Running the audit now as below, it returned '0' and rerunning the query
> still failed to return triples with the SPO pattern included.
> select DB.DBA.RDF_AUDIT_METADATA(1,'*');
>
> However....this has put the database into an interesting state. Previously,
> this graph held triples and could be read by some queries. Now it does and
> doesn't, depending on how I ask. I ran some of these queries immediately
> before the audit and got the expected results.
> ---
> sparql
> prefix o: <http://myOntology/>
>
> select *
> from <http://myGraph/>
> {
> ?S ?P ?O .
> }
> ---
> Nothing is returned.
> ---
> sparql
> prefix o: <http://myOntology/>
>
> select *
> from <http://myGraph/>
> {
> ?S a o:myClass .
> }
> ---
> Nothing is returned.
> ---
> sparql
> prefix o: <http://myOntology/>
> select ?G ?S
> where { GRAPH ?G {
> ?S a o:myClass .
> }};
> ---
> Nothing is returned.
> --
> sparql
> select distinct ?G
> where { GRAPH ?G {
> ?S ?P ?O .
> }};
> ---
> This lists every graph including the graph in question, suggesting that at
> least one triple does in fact exist in it.
> Conductor->LinkedData->Graphs also lists the graph.
>
> I'm not sure what to do with the DB now.
>
> I can provide a login if you're interested in a closer look at it.
>
> I did copy this database and transaction log to a clean build of develop7 as
> of a day ago and that had the same problem though it's unknown whether it
> would still be capable of getting into that state. Without knowing how it
> got into this state, it's not practical to retest in any particular release
> as the intermittence ensures there'll always be a more recent release to test
> against when it does occur.
>
>
>
> On 21 February 2014 14:37, Hugh Williams <hwilli...@openlinksw.com> wrote:
> Hi Quentin,
>
> Have you tried running the DB.DBA.RDF_AUDIT_METADATA() function which can
> check for and repair RDF metadata corruption, as detailed at:
>
> http://docs.openlinksw.com/virtuoso/fn_rdf_audit_metadata.html
>
> Best Regards
> Hugh Williams
> Professional Services
> OpenLink Software, Inc. // http://www.openlinksw.com/
> Weblog -- http://www.openlinksw.com/blogs/
> LinkedIn -- http://www.linkedin.com/company/openlink-software/
> Twitter -- http://twitter.com/OpenLink
> Google+ -- http://plus.google.com/100570109519069333827/
> Facebook -- http://www.facebook.com/OpenLinkSoftware
> Universal Data Access, Integration, and Management Technology Providers
>
> On 20 Feb 2014, at 05:08, Quentin <quent...@clearbluewater.com.au> wrote:
>
> > Actually, the explain plan was from a pattern in an earlier testcase that
> > also failed. The one listed has this explain plan.
> > REPORT
> > VARCHAR
> > {
> > RDF_QUAD_POGS 8 rows(s_10_2_t0.S)
> > P = ##type , O = #/APIConsumer G = #/
> >
> > Precode:
> > 0: S := Call __id2in (s_10_2_t0.S)
> > 5: BReturn 0
> > RDF_QUAD_GS unq 0.64 rows ()
> > inlined G = #/ , S = s_10_2_t0.S
> > RDF_QUAD_SP 10 rows(s_10_2_t1.P)
> > inlined S = k_s_10_2_t0.S
> > RDF_QUAD_POGS 0.3 rows(s_10_2_t1.O)
> > inlined P = k_s_10_2_t1.P S = k_s_10_2_t0.S , G = #/
> >
> > After code:
> > 0: P := Call __id2in (s_10_2_t1.P)
> > 5: O := Call __ro2sq (s_10_2_t1.O)
> > 10: BReturn 0
> > Select (S, P, O)
> > }
> > No. of rows in result: 20
> >
> >
> > On 20 February 2014 16:05, Quentin <quent...@clearbluewater.com.au> wrote:
> > This appears to be an intermittent error that pops up every few weeks,
> > restarting the DB usually resolves it though not this time.
> >
> > The query that fails is of the form:
> >
> > sparql
> > prefix o: <http://myOntology/>
> >
> > select *
> > from <http://myGraph/>
> > {
> >
> > ?S a o:myClass .
> > #?S ?P ?O .
> > }
> > ====
> > It works until I remove that comment, correctly returning three bindings
> > for ?S. Once that comment is removed, zero bindings are returned. If I
> > comment the class line and just return SPO, I can find the ?S in the
> > triples that matches the class binding.
> >
> > The explain plan is this:
> > REPORT
> > VARCHAR
> > {
> > RDF_QUAD_POGS 8 rows(s_11_2_t0.S)
> > P = ##type , O = #/MyClass G = #/
> >
> > Precode:
> > 0: S := Call __id2in (s_11_2_t0.S)
> > 5: BReturn 0
> > RDF_QUAD_GS unq 0.5 rows ()
> > inlined G = #/ , S = s_11_2_t0.S
> > RDF_QUAD_SP 8.3 rows(s_11_2_t1.P)
> > inlined S = k_s_11_2_t0.S
> > RDF_QUAD_POGS 0.28 rows(s_11_2_t1.O)
> > inlined P = k_s_11_2_t1.P S = k_s_11_2_t0.S , G = #/
> >
> > After code:
> > 0: P := Call __id2in (s_11_2_t1.P)
> > 5: O := Call __ro2sq (s_11_2_t1.O)
> > 10: BReturn 0
> > Select (S, P, O)
> > }
> > No. of rows in result: 20
> >
> > Debug log under trace_on shows nothing unusual.
> >
> > The instance is:
> > Version 7.0.1-dev.3207-pthreads as of Feb 3 2014
> > Compiled for Linux (x86_64-unknown-linux-gnu)
> >
> > I've quarantined the running instance of the DB and it consistently fails
> > as above. This behaviour began just a few hours ago, queries of this sort
> > performed perfectly this morning and then began failing abruptly with no
> > obvious reason why.
> >
> > I'm not sure it's related but when I cloned the running instance and
> > started the DB on the clone, the log includes this error:
> > 05:01:06 ERROR: Error executing a server init statement : 22023: SR528:
> > Uninitialized property qmfOkForAnySqlvalue in JSO instance
> > <http://www.openlinksw.com/virtrdf-data-formats#default-iid> of type
> > <http://www.openlinksw.com/schemas/virtrdf#QuadMapFormat> --
> > DB.DBA.RDF_QUAD_FT_UPGRADE ()
> >
> >
> > --
> > Quentin | Clear Blue Water Pty Ltd
> > quent...@clearbluewater.com.au
> >
> >
> >
> > --
> > Quentin | Clear Blue Water Pty Ltd
> > quent...@clearbluewater.com.au
> > ------------------------------------------------------------------------------
> > Managing the Performance of Cloud-Based Applications
> > Take advantage of what the Cloud has to offer - Avoid Common Pitfalls.
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>
>
>
>
> --
> Quentin | Clear Blue Water Pty Ltd
> quent...@clearbluewater.com.au
> ------------------------------------------------------------------------------
> Managing the Performance of Cloud-Based Applications
> Take advantage of what the Cloud has to offer - Avoid Common Pitfalls.
> Read the Whitepaper.
> http://pubads.g.doubleclick.net/gampad/clk?id=121054471&iu=/4140/ostg.clktrk_______________________________________________
> Virtuoso-users mailing list
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