Missing triples in SEM_MATCH query

Hi,
After loading the LUBM50,0 test data into Oracle 11g and running the sample queries I found some very strange behavior:
Test query 14 for example returns 0 results (should be 393730 result sets - no inferencing is needed).
Most queries work as expected, however in some cases data is not returned from SEM_MATCH (I was not yet able to figure out what really causes this behavior).
This is what I did:
Using Oracle 11gR1 (11.1.0.6.0) on Windows XP
Load the test data (LUBM 50,0) via sqlldr to staging table and bulk load from there to the table used in the semantic model.
The following query produces 0 results:
select x from
     table (sem_match('(?x rdf:type ub:UndergraduateStudent)',
     sem_models('lubm'),
     null,
     sem_aliases(sem_alias('ub','http://www.lehigh.edu/%7Ezhp2/2004/0401/univ-bench.owl#')), null));
However, the data is actually contained in the table holding the SDO_RDF_TRIPLE_S.
A query for all triples using SEM_MATCH also returns triples that satisfy this query and should be returned. (Query using '(?o ?p ?s)').
By querying the table containing the semantic references directly also the correct results are returned.
More strangely a query using sem_match like the one above querying for an object of "ub:GraduateStudent" instead of "ub:UndergraduateStudent" also returns (the correct) results.
Moreover, the bulk load contains 6,890,946 triples which is the number of triples contained in the staging table and after bulk loading from there exactly this number is also contained in the table for the semantic model.
However, the query using SEM_MATCH (unrestricted query of '(?o ?p ?s)') which should also return this number of triples only returns 6,657,233 triples (I have not yet checked which triples are missing, but there are more than 200,000 triples gone)
Is there any hint on what I might be doing wrong or how to solve this problem?
Thanks,
Wolfgang

Wolfgang,
I'd suggest downloading the latest patch for 11g (links are posted by Melli in the following thread: Latest Patches for Oracle as suggested by TopBraid and then re-loading and then re-trying the query. Please let us know if that solves the problem.
Thanks,
- Souri.

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SEM_MATCH query execution time when a predicate is set as a variable

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Our ontology contains 70 million triples (12.5 million asserted triples and 58 million inferred triples). We created a virtual model which includes both asserted and inferred triples).
Our semantic network index configuration is 'PSCM' (index status is valid).
The problem we encounter is when we run a SEM_MATCH query which includes a predicate as a variable, the query ran for 22 seconds. When a similar query is run when the variable is subject or an object or both the time for the SEM_MATCH query execution is 0.2 seconds. Is this reasonable? What do we do wrong?
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Cheers,
Doron

Hi,
So far no lack, None of the solutions are working.
Query execution time didn't change after executing the following:
1. SEM_APIS.DROP_SEM_INDEX('SCP');
2. SEM_APIS.ADD_SEM_INDEX('SCPM');
3. SEM_APIS.ALTER_SEM_INDEX_ON_MODEL('TOM','SCPM','REBUILD');
4. SEM_APIS.ALTER_SEM_INDEX_ON_MODEL('TOM_TF','SCPM','REBUILD');
5. SEM_APIS.ALTER_SEM_INDEX_ON_RULES_INDEX('TOM_RI','SCPM','REBUILD');
My original query (see below) execution time remains 22 secs.
SELECT a FROM TABLE ( SEM_MATCH
( ' { <http://www.tomproj.com/rep#entity_4> ?a 4 }',
SEM_MODELS( 'TOM_VIRTUAL_MODEL') ,
NULL,
NULL,
NULL,
'ALLOW_DUP=T'));
When running the SEM_MATCH on each model ('TOM,'TOM_TF') separately execution time was very fast (~0.007 secs):
1. SELECT a FROM TABLE ( SEM_MATCH
( ' { <http://www.tomproj.com/rep#entity_4> ?a 4 }',
SEM_MODELS( 'TOM') ,
NULL,
NULL,
NULL,
NULL));
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( ' { <http://www.tomproj.com/rep#entity_4> ?a 4 }',
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NULL,
NULL,
NULL,
NULL));
When running the query on both models, execution time was 54 secs:
SELECT a FROM TABLE ( SEM_MATCH
( ' { <http://www.tomproj.com/rep#entity_4> ?a 4 }',
SEM_MODELS( 'TOM','TOM_TF') ,
NULL,
NULL,
NULL,
NULL));
We also run the original query via the Jena Adaptor using Java language and SPARQL, but the results were similar.
As for using parallel parameter in SEM_APIS.ALTER_SEM_INDEX…, since we are using Oracle 11g release 1 the SEM_APIS.ALTER_SEM_INDEX doesn’t support the parallel parameter as far as we know.
In Oracle 11g release 2 the SEM_APIS.ALTER_SEM_INDEX was extended to support the use of 'parallel' parameter.
Any ideas on what do we do wrong?
Cheers,
Doron

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ppf.full_name Person_Name,
paf.Assignment_number Assignment_number,
ppf.Employee_number Employee_number,
job.name job,
grade.name salary_grade,
grdrule.MINIMUM,
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per_grades_tl grade,
hr_organization_units hou,
pay_grade_rules_f grdrule,
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PER_PAY_PROPOSALS ppp
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Message was edited by: Melwyn Joseph
Message was edited by: Melwyn Joseph

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mark it as answer if it answered your question :)

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