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/
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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
> ------------------------------------------------------------------------------
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