subject:"Re\: \[Virtuoso\-users\] Query optimization, possible indexing\?"

Re: [Virtuoso-users] Query optimization, possible indexing?

2018-01-26 Thread Jason Koh

Hi Sergey,

Yes, your suggestion works for me. I do not know which between Virtuoso and
Jena is following the correct semantics of SPARQL, but I will follow the
more constrained (~=precise) semantics of Virtuoso.

Thank you!


With regards,
Jason Koh
cseweb.ucsd.edu/~jbkoh

On Thu, Jan 25, 2018 at 7:26 AM, Sergey Malinin 
wrote:

> Hi Jason,
>
> In you sources:
> > Query sparql = QueryFactory.create(qStr);
> > VirtuosoQueryExecution vqd = 
> > VirtuosoQueryExecutionFactory.create(sparql,
> graph);
>
> Based on this, SPARQL query will be parsed by Jena ARQ and after this, it
> will be converted back to String before send to Virtuoso.
> Therefore Jena ARQ could change your original query a little.
> You could check it with something:
>
> String qStr = "PREFIX base:  PREFIX xsd: <
> http://www.w3.org/2001/XMLSchema#>  SELECT ?s {?s base:name
> \"test_sensor\"^^xsd:string}";
> Query sparql = QueryFactory.create(qStr);
> System.out.println(sparql.toString());
>
> The output log will be:
> -
> PREFIX  xsd:  
> PREFIX  base: 
>
> SELECT  ?s
> WHERE
>   { ?s  base:name  "test_sensor" }
> -
>
> You could see, that Jena ARQ changed your query text a little, so it
> doesn't work as expected.
>
>
> I offer change you code like:
>
> - Query sparql = QueryFactory.create(qStr);
> - VirtuosoQueryExecution vqd = 
> VirtuosoQueryExecutionFactory.create(sparql,
> graph);
> +
> + VirtuosoQueryExecution vqd = 
> VirtuosoQueryExecutionFactory.create(qStr,
> graph);
>
> so your query will not be changed by Jena ARQ.
>
>
>
> On 01/25/2018 07:42 AM, Jason Koh wrote:
>
>> Dear Hugh and the community,
>>
>> I have created a regenerator repository: https://github.com/jbkoh/virtj
>> ena_regenerator
>>
>> If available, please review the problem. I think it's the problem of Virt
>> Jena, your feedback would be much useful for me to write the right code.
>>
>> Thanks!
>>
>>
>> With regards,
>> Jason Koh
>> cseweb.ucsd.edu/~jbkoh 
>>
>> On Tue, Jan 23, 2018 at 12:50 PM, Jason Koh > jb...@eng.ucsd.edu>> wrote:
>>
>> Forgot to clarify the configuration:
>>
>> Ubuntu 16.04 (64bit)
>> Virtuoso 7.2.4.2
>> Virtuoso Jean: virt_jena3
>> Virtuodo JDBC: virtjdbc4
>> Java: openjdk version "1.8.0_151"
>>
>> Thank you.
>>
>>
>> With regards,
>> Jason Koh
>> cseweb.ucsd.edu/~jbkoh 
>>
>> On Tue, Jan 23, 2018 at 12:46 PM, Jason Koh > > wrote:
>>
>> Here's the Java code snippet not working:
>> ```java
>> String nameStr = "test_sensor1";
>> String BASE = "http://base.org#";;
>> String uuid = "x";
>> Node name = NodeFactory.createLiteralByValue(nameStr, XSDstring);
>> Node point = NodeFactory.createURI(BASE + uuid);
>> Node hasName = NodeFactory.createURI(BASE + "name");
>> graph.add(new Triple(point, hasName, name));
>> String qStr =
>>  "PREFIX base: \n" +
>>  "SELECT ?s WHERE {\n" +
>>  "?s base:name \"test_sensor1\" . \n" +
>>  "}";
>> Query sparql = QueryFactory.create(qStr);
>> VirtuosoQueryExecution vqd = 
>> VirtuosoQueryExecutionFactory.create(sparql,
>> graph);
>> ResultSet results = vqd.execSelect();
>> while (results.hasNext()) {
>>QuerySolution result = results.nextSolution();
>>System.out.println(result.get("s").toString());
>> }
>> System.out.println("Done");
>>}
>> ```
>>
>> The value ``results`` is empty and this code does not print
>> anything. I can make a regenerator. Let me know if that helps.
>>
>>
>> With regards,
>> Jason Koh
>> cseweb.ucsd.edu/~jbkoh 
>>
>> On Tue, Jan 23, 2018 at 12:16 PM, Jason Koh > > wrote:
>>
>> Hi Hugh,
>>
>> I inserted the tripled through /Virtuoso Jena/ and I can see
>> triples like
>> ``ex:base:nametest_sensor0``
>> when I query just with ?s ?p ?o. However, I don't get any
>> result with ``?s base:name "test_sensor0"``.
>>
>> As you showed, it works with command line insertions. Let me
>> verify the source of the problem once again and come back.
>>
>> Thank you!
>>
>>
>> With regards,
>> Jason Koh
>> cseweb.ucsd.edu/~jbkoh 
>>
>>
>> On Tue, Jan 23, 2018 at 3:17 AM, Hugh Williams <
>> hwilli...@openlinksw.com > wrote:
>>
>> Hi Jason,
>>
>> What exactly is not working for you ? As the following
>> works for me:
>>
>>

Re: [Virtuoso-users] Query optimization, possible indexing?

2018-01-25 Thread Sergey Malinin

Hi Jason,

In you sources:
> Query sparql = QueryFactory.create(qStr);
> VirtuosoQueryExecution vqd = 
VirtuosoQueryExecutionFactory.create(sparql, graph);

Based on this, SPARQL query will be parsed by Jena ARQ and after this, it will 
be converted back to String before send to Virtuoso.
Therefore Jena ARQ could change your original query a little.
You could check it with something:

String qStr = "PREFIX base:  PREFIX xsd: 
  SELECT ?s {?s base:name \"test_sensor\"^^xsd:string}";
Query sparql = QueryFactory.create(qStr);
System.out.println(sparql.toString());

The output log will be:
-
PREFIX  xsd:  
PREFIX  base: 

SELECT  ?s
WHERE
  { ?s  base:name  "test_sensor" }
-

You could see, that Jena ARQ changed your query text a little, so it doesn't 
work as expected.

I offer change you code like:

- Query sparql = QueryFactory.create(qStr);
- VirtuosoQueryExecution vqd = 
VirtuosoQueryExecutionFactory.create(sparql, graph);
+
+ VirtuosoQueryExecution vqd = 
VirtuosoQueryExecutionFactory.create(qStr, graph);

so your query will not be changed by Jena ARQ.

On 01/25/2018 07:42 AM, Jason Koh wrote:

Dear Hugh and the community,

I have created a regenerator repository: 
https://github.com/jbkoh/virtjena_regenerator

If available, please review the problem. I think it's the problem of Virt Jena, 
your feedback would be much useful for me to write the right code.

Thanks!

With regards,
Jason Koh
cseweb.ucsd.edu/~jbkoh 

On Tue, Jan 23, 2018 at 12:50 PM, Jason Koh mailto:jb...@eng.ucsd.edu>> wrote:

Forgot to clarify the configuration:

Ubuntu 16.04 (64bit)
Virtuoso 7.2.4.2
Virtuoso Jean: virt_jena3
Virtuodo JDBC: virtjdbc4
Java: openjdk version "1.8.0_151"

Thank you.

With regards,
Jason Koh
cseweb.ucsd.edu/~jbkoh 

On Tue, Jan 23, 2018 at 12:46 PM, Jason Koh mailto:jb...@eng.ucsd.edu>> wrote:

Here's the Java code snippet not working:
```java
String nameStr = "test_sensor1";
String BASE = "http://base.org#";;
String uuid = "x";
Node name = NodeFactory.createLiteralByValue(nameStr, XSDstring);
Node point = NodeFactory.createURI(BASE + uuid);
Node hasName = NodeFactory.createURI(BASE + "name");
graph.add(new Triple(point, hasName, name));
String qStr =
     "PREFIX base: \n" +
     "SELECT ?s WHERE {\n" +
     "?s base:name \"test_sensor1\" . \n" +
     "}";
Query sparql = QueryFactory.create(qStr);
VirtuosoQueryExecution vqd = 
VirtuosoQueryExecutionFactory.create(sparql, graph);
ResultSet results = vqd.execSelect();
while (results.hasNext()) {
   QuerySolution result = results.nextSolution();
   System.out.println(result.get("s").toString());
}
System.out.println("Done");
   }
```

The value ``results`` is empty and this code does not print anything. I 
can make a regenerator. Let me know if that helps.

With regards,
Jason Koh
cseweb.ucsd.edu/~jbkoh 

On Tue, Jan 23, 2018 at 12:16 PM, Jason Koh mailto:jb...@eng.ucsd.edu>> wrote:

Hi Hugh,

I inserted the tripled through /Virtuoso Jena/ and I can see 
triples like
``ex:    base:name    test_sensor0``
when I query just with ?s ?p ?o. However, I don't get any result with ``?s 
base:name "test_sensor0"``.

As you showed, it works with command line insertions. Let me verify 
the source of the problem once again and come back.

Thank you!

With regards,
Jason Koh
cseweb.ucsd.edu/~jbkoh 

On Tue, Jan 23, 2018 at 3:17 AM, Hugh Williams mailto:hwilli...@openlinksw.com>> wrote:

Hi Jason,

What exactly is not working for you ? As the following works 
for me:

SQL> SPARQL PREFIX base:  INSERT DATA { GRAPH  { <1> base:name 
"sensor1" . } };

Done. -- 1 msec.
SQL> SPARQL SELECT * FROM  WHERE {?s ?p ?o};
s                                                                                 p 
                    o
LONG VARCHAR                                                                      LONG VARCHAR 
                     LONG VARCHAR

___

Re: [Virtuoso-users] Query optimization, possible indexing?

2018-01-25 Thread Henrik Schmidt

If there will be a fix for this it would be nice this solution for the 
jena provider will be also added to the main repo :


https://github.com/openlink/virtuoso-opensource/issues/687

Am 25.01.2018 um 11:19 schrieb Hugh Williams:

Hi Quentin,

Thanks for the input, I see what you mean as the jena program is 
executing the query:


String qStr = "PREFIX base:  PREFIX xsd: 
SELECT ?s {?s base:name 
\"test_sensor\"^^xsd:string}";


and does actually return results when run against isql:

SQL> SPARQL define input:default-graph-uri   PREFIX  xsd:  
 PREFIX  base:   
SELECT ?s WHERE   { ?s  base:name  "test_sensor"^^xsd:string };

s
LONG VARCHAR
___

http://base.org#x1
http://base.org#x2

2 Rows. -- 101 msec.
SQL>

But when I set Virtuoso trace_on() ^^xsd:string  element is being 
stripped off by time it gets to Virtuoso ie


define input:default-graph-uri 
PREFIX  xsd:  
PREFIX  base: 

SELECT  ?s
WHERE
  { ?s  base:name  "test_sensor" }

which I assume must be done by the Jena Provider, thus we need to 
check this ...


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 25 Jan 2018, at 02:27, Quentin > wrote:


Hi Hugh,

In your example, you have this query:

SELECT  ?s WHERE   { ?s  base:name  "test_sensor" };


But the data is:
s 
o 
datatype
LONG VARCHAR 
 LONG 
VARCHAR 
 LONG 
VARCHAR

___
http://base.org#x1 
   test_sensor 
http://www.w3.org/2001/XMLSchema#string



Would you expect a query for string literals to return xsd typed strings?
I've always found that filtering or querying over string literals 
would not be successful unless everything was very carefully typed.


I note that Jason tried xsd types in his queries in the first 
instance, so that's probably not actually the issue here.

--
Regards,
Quentin Serrurier.
GuidingHand.Solutions





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Re: [Virtuoso-users] Query optimization, possible indexing?

2018-01-25 Thread Hugh Williams

Hi Quentin,

Thanks for the input, I see what you mean as the jena program is executing the 
query:

String qStr = "PREFIX base:  PREFIX xsd: 
  SELECT ?s {?s base:name 
\"test_sensor\"^^xsd:string}";

and does actually return results when run against isql:

SQL> SPARQL define input:default-graph-uri   PREFIX  xsd:  
 PREFIX  base:   SELECT  
?s WHERE   { ?s  base:name  "test_sensor"^^xsd:string };
s
LONG VARCHAR
___

http://base.org#x1
http://base.org#x2

2 Rows. -- 101 msec.
SQL>

But when I set Virtuoso trace_on() ^^xsd:string  element is being stripped off 
by time it gets to Virtuoso ie

define input:default-graph-uri  
PREFIX  xsd:  
PREFIX  base: 

SELECT  ?s
WHERE
  { ?s  base:name  "test_sensor" }

which I assume must be done by the Jena Provider, thus we need to check this ...

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 25 Jan 2018, at 02:27, Quentin  wrote:
> 
> Hi Hugh,
> 
> In your example, you have this query:
>> SELECT  ?s WHERE   { ?s  base:name  "test_sensor" };
> 
> But the data is:
> s 
> o 
> datatype
> LONG VARCHAR  
> LONG VARCHAR  
> LONG VARCHAR
> ___
> http://base.org#x1
> test_sensor   
> http://www.w3.org/2001/XMLSchema#string
> 
> 
> Would you expect a query for string literals to return xsd typed strings?
> I've always found that filtering or querying over string literals would not 
> be successful unless everything was very carefully typed.
> 
> I note that Jason tried xsd types in his queries in the first instance, so 
> that's probably not actually the issue here.
> -- 
> Regards,
> Quentin Serrurier.
> GuidingHand.Solutions
> 

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Re: [Virtuoso-users] Query optimization, possible indexing?

2018-01-25 Thread Jason Koh

Hugh,

Thanks for taking a look at this problem. It's been painful to me... Let me
know once you get an idea on this or if you need any help from my side.

Thanks!


With regards,
Jason Koh
cseweb.ucsd.edu/~jbkoh

On Wed, Jan 24, 2018 at 3:34 PM, Hugh Williams 
wrote:

> Hi Jason,
>
> I have been able to compile and run your program and can see the problem:
>
> De-iMac-232:virtuoso_driver hwilliams$ javac -classpath
> ".:../lib-3.3.0/commons-lang3-3.4.jar:../lib-3.3.0/jena-arq-
> 3.3.0-SNAPSHOT.jar:../lib-3.3.0/jena-iri-3.3.0-SNAPSHOT.jar:
> ../lib-3.3.0/jena-base-3.3.0-SNAPSHOT.jar:../lib-3.3.0/
> jena-core-3.3.0-SNAPSHOT.jar:../../../libsrc/
> JDBCDriverType4/virtjdbc4.jar:../virt_jena3.jar:../lib-3.3.
> 0/jcl-over-slf4j-1.7.21.jar:../lib-3.3.0/log4j-1.2.17.jar:..
> /lib-3.3.0/slf4j-api-1.7.21.jar:../lib-3.3.0/slf4j-
> log4j12-1.7.21.jar:../lib-3.3.0/xercesImpl-2.11.0.jar:../
> lib-3.3.0/xml-apis-1.4.01.jar:../lib-3.3.0/jena-shaded-
> guava-3.3.0-SNAPSHOT.jar:../lib-3.3.0/libthrift-0.9.3.jar:
> ../lib-3.3.0/sparql-generate-jena-1.0.jar:../lib-3.3.0/
> jena-arq-3.3.0-SNAPSHOT.jar:../lib-3.3.0/httpclient-4.5.2.
> jar:../lib-3.3.0/httpclient-cache-4.5.2.jar" Tester.java
> De-iMac-232:virtuoso_driver hwilliams$ java -classpath
> ".:../lib-3.3.0/commons-lang3-3.4.jar:../lib-3.3.0/jena-arq-
> 3.3.0-SNAPSHOT.jar:../lib-3.3.0/jena-iri-3.3.0-SNAPSHOT.jar:
> ../lib-3.3.0/jena-base-3.3.0-SNAPSHOT.jar:../lib-3.3.0/
> jena-core-3.3.0-SNAPSHOT.jar:../../../libsrc/
> JDBCDriverType4/virtjdbc4.jar:../virt_jena3.jar:../lib-3.3.
> 0/jcl-over-slf4j-1.7.21.jar:../lib-3.3.0/log4j-1.2.17.jar:..
> /lib-3.3.0/slf4j-api-1.7.21.jar:../lib-3.3.0/slf4j-
> log4j12-1.7.21.jar:../lib-3.3.0/xercesImpl-2.11.0.jar:../
> lib-3.3.0/xml-apis-1.4.01.jar:../lib-3.3.0/jena-shaded-
> guava-3.3.0-SNAPSHOT.jar:../lib-3.3.0/libthrift-0.9.3.jar:
> ../lib-3.3.0/sparql-generate-jena-1.0.jar:../lib-3.3.0/
> jena-arq-3.3.0-SNAPSHOT.jar:../lib-3.3.0/httpclient-4.5.2.
> jar:../lib-3.3.0/httpclient-cache-4.5.2.jar" Tester
> log4j:WARN No appenders could be found for logger (Jena).
> log4j:WARN Please initialize the log4j system properly.
> log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for
> more info.
> failed!
> De-iMac-232:virtuoso_driver hwilliams$
>
> In fact turning Virtuoso tracing on (with the “trace_on();” function) I
> see the query being run against Virtuoso by the Jena layer is:
>
> SPARQL define input:default-graph-uri   PREFIX  xsd:  <
> http://www.w3.org/2001/XMLSchema#> PREFIX  base: 
> SELECT  ?s WHERE   { ?s  base:name  "test_sensor" };
>
> which when I run against “isql”  also returns no results:
>
> SQL> SPARQL define input:default-graph-uri   PREFIX  xsd:  <
> http://www.w3.org/2001/XMLSchema#> PREFIX  base: 
> SELECT  ?s WHERE   { ?s  base:name  "test_sensor" };
> s
> LONG VARCHAR
> 
> ___
>
>
> 0 Rows. -- 2 msec.
> SQL>
>
> Nor does even:
>
> SQL> SPARQL define input:default-graph-uri   PREFIX  xsd:  <
> http://www.w3.org/2001/XMLSchema#> PREFIX  base: 
> SELECT  ?s WHERE   { ?s  ?p  "test_sensor" };
> s
> LONG VARCHAR
> 
> ___
>
>
> 0 Rows. -- 2 msec.
> SQL>
>
> But the following does:
>
> SQL> SPARQL define input:default-graph-uri   PREFIX  xsd:  <
> http://www.w3.org/2001/XMLSchema#> PREFIX  base: 
> SELECT  ?s WHERE   { ?s  ?p  ?o };
> s
> LONG VARCHAR
> 
> ___
>
> http://base.org#x1
> http://base.org#x2
>
> 2 Rows. -- 5 msec.
> SQL>
>
> Which is strange as my  test case does work with the same type of query
> and both literal values are string types:
>
> SQL> SPARQL define input:default-graph-uri   PREFIX  xsd:  <
> http://www.w3.org/2001/XMLSchema#> PREFIX  base: 
> SELECT  ?s ?o ?datatype WHERE   { ?s  ?p  ?o . BIND (DATATYPE(?o) as
> ?datatype)};
> s
>o
>  datatype
> LONG VARCHAR
> LONG VARCHAR
>   LONG VARCHAR
> 
> ___
>
> http://base.org#x1
> test_sensor
>http://www.w3.org/2001/XMLSchema#string
> http://base.org#x2
> test_sensor
>http://www.w3.org/2001/XMLSchema#string
>
> 2 Rows. -- 11 msec.
> SQL>
>
> SQL> SPARQL PREFIX base:  SELECT ?s ?o ?datatype FROM  WHERE
> {?s ?p ?o . BIND (DATATYPE(?o) as ?datatype)};
> s
>o
>  datatype
> LONG VARCHAR
> LONG VARCHAR
>   LONG VARCHAR
> 
> ___
>
> 1
>sensor1
>  http://www.w3.org/2001/XMLSchema#string
>
> 1 Rows. -- 6 msec.
> SQL>
>
> Will have to look into this further ...
>
> Best Regards
> Hugh Williams
> Professional Services
>

Re: [Virtuoso-users] Query optimization, possible indexing?

2018-01-24 Thread Quentin


Hi Hugh,

In your example, you have this query:

SELECT  ?s WHERE   { ?s  base:name  "test_sensor" };


But the data is:
s
 o   
  datatype
LONG VARCHAR 
 LONG VARCHAR
  LONG VARCHAR

___
http://base.org#x1   
 test_sensor 
  http://www.w3.org/2001/XMLSchema#string



Would you expect a query for string literals to return xsd typed 
strings?
I've always found that filtering or querying over string literals would 
not be successful unless everything was very carefully typed.


I note that Jason tried xsd types in his queries in the first instance, 
so that's probably not actually the issue here.

--
Regards,
Quentin Serrurier.
GuidingHand.Solutions

On 2018-01-25 07:34, Hugh Williams wrote:

Hi Jason,

I have been able to compile and run your program and can see the 
problem:


De-iMac-232:virtuoso_driver hwilliams$ javac -classpath
".:../lib-3.3.0/commons-lang3-3.4.jar:../lib-3.3.0/jena-arq-3.3.0-SNAPSHOT.jar:../lib-3.3.0/jena-iri-3.3.0-SNAPSHOT.jar:../lib-3.3.0/jena-base-3.3.0-SNAPSHOT.jar:../lib-3.3.0/jena-core-3.3.0-SNAPSHOT.jar:../../../libsrc/JDBCDriverType4/virtjdbc4.jar:../virt_jena3.jar:../lib-3.3.0/jcl-over-slf4j-1.7.21.jar:../lib-3.3.0/log4j-1.2.17.jar:../lib-3.3.0/slf4j-api-1.7.21.jar:../lib-3.3.0/slf4j-log4j12-1.7.21.jar:../lib-3.3.0/xercesImpl-2.11.0.jar:../lib-3.3.0/xml-apis-1.4.01.jar:../lib-3.3.0/jena-shaded-guava-3.3.0-SNAPSHOT.jar:../lib-3.3.0/libthrift-0.9.3.jar:../lib-3.3.0/sparql-generate-jena-1.0.jar:../lib-3.3.0/jena-arq-3.3.0-SNAPSHOT.jar:../lib-3.3.0/httpclient-4.5.2.jar:../lib-3.3.0/httpclient-cache-4.5.2.jar"
Tester.java
De-iMac-232:virtuoso_driver hwilliams$ java -classpath
".:../lib-3.3.0/commons-lang3-3.4.jar:../lib-3.3.0/jena-arq-3.3.0-SNAPSHOT.jar:../lib-3.3.0/jena-iri-3.3.0-SNAPSHOT.jar:../lib-3.3.0/jena-base-3.3.0-SNAPSHOT.jar:../lib-3.3.0/jena-core-3.3.0-SNAPSHOT.jar:../../../libsrc/JDBCDriverType4/virtjdbc4.jar:../virt_jena3.jar:../lib-3.3.0/jcl-over-slf4j-1.7.21.jar:../lib-3.3.0/log4j-1.2.17.jar:../lib-3.3.0/slf4j-api-1.7.21.jar:../lib-3.3.0/slf4j-log4j12-1.7.21.jar:../lib-3.3.0/xercesImpl-2.11.0.jar:../lib-3.3.0/xml-apis-1.4.01.jar:../lib-3.3.0/jena-shaded-guava-3.3.0-SNAPSHOT.jar:../lib-3.3.0/libthrift-0.9.3.jar:../lib-3.3.0/sparql-generate-jena-1.0.jar:../lib-3.3.0/jena-arq-3.3.0-SNAPSHOT.jar:../lib-3.3.0/httpclient-4.5.2.jar:../lib-3.3.0/httpclient-cache-4.5.2.jar"
Tester
log4j:WARN No appenders could be found for logger (Jena).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig
for more info.
failed!
De-iMac-232:virtuoso_driver hwilliams$

In fact turning Virtuoso tracing on (with the “trace_on();” function)
I see the query being run against Virtuoso by the Jena layer is:

SPARQL define input:default-graph-uri   PREFIX  xsd:
 PREFIX  base: 
SELECT  ?s WHERE   { ?s  base:name  "test_sensor" };

which when I run against “isql”  also returns no results:

SQL> SPARQL define input:default-graph-uri   PREFIX  xsd:
 PREFIX  base: 
SELECT  ?s WHERE   { ?s  base:name  "test_sensor" };
s
LONG VARCHAR
___


0 Rows. -- 2 msec.
SQL>

Nor does even:

SQL> SPARQL define input:default-graph-uri   PREFIX  xsd:
 PREFIX  base: 
SELECT  ?s WHERE   { ?s  ?p  "test_sensor" };
s
LONG VARCHAR
___


0 Rows. -- 2 msec.
SQL>

But the following does:

SQL> SPARQL define input:default-graph-uri   PREFIX  xsd:
 PREFIX  base: 
SELECT  ?s WHERE   { ?s  ?p  ?o };
s
LONG VARCHAR
___

http://base.org#x1
http://base.org#x2

2 Rows. -- 5 msec.
SQL>

Which is strange as my  test case does work with the same type of
query and both literal values are string types:

SQL> SPARQL define input:default-graph-uri   PREFIX  xsd:
 PREFIX  base: 
SELECT  ?s ?o ?datatype WHERE   { ?s  ?p  ?o . BIND (DATATYPE(?o) as
?datatype)};
s
   o
  datatype
LONG VARCHAR
   LONG VARCHAR
  LONG VARCHAR
___

http://base.org#x1

Re: [Virtuoso-users] Query optimization, possible indexing?

2018-01-24 Thread Hugh Williams

Hi Jason,

I have been able to compile and run your program and can see the problem:

De-iMac-232:virtuoso_driver hwilliams$ javac -classpath 
".:../lib-3.3.0/commons-lang3-3.4.jar:../lib-3.3.0/jena-arq-3.3.0-SNAPSHOT.jar:../lib-3.3.0/jena-iri-3.3.0-SNAPSHOT.jar:../lib-3.3.0/jena-base-3.3.0-SNAPSHOT.jar:../lib-3.3.0/jena-core-3.3.0-SNAPSHOT.jar:../../../libsrc/JDBCDriverType4/virtjdbc4.jar:../virt_jena3.jar:../lib-3.3.0/jcl-over-slf4j-1.7.21.jar:../lib-3.3.0/log4j-1.2.17.jar:../lib-3.3.0/slf4j-api-1.7.21.jar:../lib-3.3.0/slf4j-log4j12-1.7.21.jar:../lib-3.3.0/xercesImpl-2.11.0.jar:../lib-3.3.0/xml-apis-1.4.01.jar:../lib-3.3.0/jena-shaded-guava-3.3.0-SNAPSHOT.jar:../lib-3.3.0/libthrift-0.9.3.jar:../lib-3.3.0/sparql-generate-jena-1.0.jar:../lib-3.3.0/jena-arq-3.3.0-SNAPSHOT.jar:../lib-3.3.0/httpclient-4.5.2.jar:../lib-3.3.0/httpclient-cache-4.5.2.jar"
 Tester.java 
De-iMac-232:virtuoso_driver hwilliams$ java -classpath 
".:../lib-3.3.0/commons-lang3-3.4.jar:../lib-3.3.0/jena-arq-3.3.0-SNAPSHOT.jar:../lib-3.3.0/jena-iri-3.3.0-SNAPSHOT.jar:../lib-3.3.0/jena-base-3.3.0-SNAPSHOT.jar:../lib-3.3.0/jena-core-3.3.0-SNAPSHOT.jar:../../../libsrc/JDBCDriverType4/virtjdbc4.jar:../virt_jena3.jar:../lib-3.3.0/jcl-over-slf4j-1.7.21.jar:../lib-3.3.0/log4j-1.2.17.jar:../lib-3.3.0/slf4j-api-1.7.21.jar:../lib-3.3.0/slf4j-log4j12-1.7.21.jar:../lib-3.3.0/xercesImpl-2.11.0.jar:../lib-3.3.0/xml-apis-1.4.01.jar:../lib-3.3.0/jena-shaded-guava-3.3.0-SNAPSHOT.jar:../lib-3.3.0/libthrift-0.9.3.jar:../lib-3.3.0/sparql-generate-jena-1.0.jar:../lib-3.3.0/jena-arq-3.3.0-SNAPSHOT.jar:../lib-3.3.0/httpclient-4.5.2.jar:../lib-3.3.0/httpclient-cache-4.5.2.jar"
 Tester
log4j:WARN No appenders could be found for logger (Jena).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more 
info.
failed!
De-iMac-232:virtuoso_driver hwilliams$

In fact turning Virtuoso tracing on (with the “trace_on();” function) I see the 
query being run against Virtuoso by the Jena layer is:

SPARQL define input:default-graph-uri   PREFIX  xsd:  
 PREFIX  base:   SELECT  
?s WHERE   { ?s  base:name  "test_sensor" };

which when I run against “isql”  also returns no results:

SQL> SPARQL define input:default-graph-uri   PREFIX  xsd:  
 PREFIX  base:   SELECT  
?s WHERE   { ?s  base:name  "test_sensor" };
s
LONG VARCHAR
___


0 Rows. -- 2 msec.
SQL>

Nor does even:

SQL> SPARQL define input:default-graph-uri   PREFIX  xsd:  
 PREFIX  base:   SELECT  
?s WHERE   { ?s  ?p  "test_sensor" };
s
LONG VARCHAR
___


0 Rows. -- 2 msec.
SQL> 

But the following does:

SQL> SPARQL define input:default-graph-uri   PREFIX  xsd:  
 PREFIX  base:   SELECT  
?s WHERE   { ?s  ?p  ?o };
s
LONG VARCHAR
___

http://base.org#x1
http://base.org#x2

2 Rows. -- 5 msec.
SQL>

Which is strange as my  test case does work with the same type of query and 
both literal values are string types:

SQL> SPARQL define input:default-graph-uri   PREFIX  xsd:  
 PREFIX  base:   SELECT  
?s ?o ?datatype WHERE   { ?s  ?p  ?o . BIND (DATATYPE(?o) as ?datatype)};
s   
  o 
datatype
LONG VARCHAR
  LONG VARCHAR  
LONG VARCHAR
___

http://base.org#x1  
  test_sensor   
http://www.w3.org/2001/XMLSchema#string
http://base.org#x2  
  test_sensor   
http://www.w3.org/2001/XMLSchema#string

2 Rows. -- 11 msec.
SQL>

SQL> SPARQL PREFIX base:  SELECT ?s ?o ?datatype FROM  WHERE {?s ?p 
?o . BIND (DATATYPE(?o) as ?datatype)}; 
s   
  o 
datatype
LONG VARCHAR
  LONG VARCHAR  
LONG VARCHAR
___

Re: [Virtuoso-users] Query optimization, possible indexing?

2018-01-24 Thread Jason Koh

Dear Hugh and the community,

I have created a regenerator repository:
https://github.com/jbkoh/virtjena_regenerator

If available, please review the problem. I think it's the problem of Virt
Jena, your feedback would be much useful for me to write the right code.

Thanks!


With regards,
Jason Koh
cseweb.ucsd.edu/~jbkoh

On Tue, Jan 23, 2018 at 12:50 PM, Jason Koh  wrote:

> Forgot to clarify the configuration:
>
> Ubuntu 16.04 (64bit)
> Virtuoso 7.2.4.2
> Virtuoso Jean: virt_jena3
> Virtuodo JDBC: virtjdbc4
> Java: openjdk version "1.8.0_151"
>
> Thank you.
>
>
> With regards,
> Jason Koh
> cseweb.ucsd.edu/~jbkoh
>
> On Tue, Jan 23, 2018 at 12:46 PM, Jason Koh  wrote:
>
>> Here's the Java code snippet not working:
>> ```java
>> String nameStr = "test_sensor1";
>> String BASE = "http://base.org#";;
>> String uuid = "x";
>> Node name = NodeFactory.createLiteralByValue(nameStr, XSDstring);
>> Node point = NodeFactory.createURI(BASE + uuid);
>> Node hasName = NodeFactory.createURI(BASE + "name");
>> graph.add(new Triple(point, hasName, name));
>> String qStr =
>> "PREFIX base: \n" +
>> "SELECT ?s WHERE {\n" +
>> "?s base:name \"test_sensor1\" . \n" +
>> "}";
>> Query sparql = QueryFactory.create(qStr);
>> VirtuosoQueryExecution vqd = VirtuosoQueryExecutionFactory.create(sparql,
>> graph);
>> ResultSet results = vqd.execSelect();
>> while (results.hasNext()) {
>>   QuerySolution result = results.nextSolution();
>>   System.out.println(result.get("s").toString());
>> }
>> System.out.println("Done");
>>   }
>> ```
>>
>> The value ``results`` is empty and this code does not print anything. I
>> can make a regenerator. Let me know if that helps.
>>
>>
>> With regards,
>> Jason Koh
>> cseweb.ucsd.edu/~jbkoh
>>
>> On Tue, Jan 23, 2018 at 12:16 PM, Jason Koh  wrote:
>>
>>> Hi Hugh,
>>>
>>> I inserted the tripled through *Virtuoso Jena* and I can see triples
>>> like
>>> ``ex:base:nametest_sensor0``
>>> when I query just with ?s ?p ?o. However, I don't get any result with
>>> ``?s base:name "test_sensor0"``.
>>>
>>> As you showed, it works with command line insertions. Let me verify the
>>> source of the problem once again and come back.
>>>
>>> Thank you!
>>>
>>>
>>> With regards,
>>> Jason Koh
>>> cseweb.ucsd.edu/~jbkoh
>>>
>>> On Tue, Jan 23, 2018 at 3:17 AM, Hugh Williams >> > wrote:
>>>
 Hi Jason,

 What exactly is not working for you ? As the following works for me:

 SQL> SPARQL PREFIX base:  INSERT DATA { GRAPH  { <1>
 base:name "sensor1" . } };

 Done. -- 1 msec.
 SQL> SPARQL SELECT * FROM  WHERE {?s ?p ?o};
 s
p
  o
 LONG VARCHAR
   LONG VARCHAR
 LONG VARCHAR
 
 ___

 1
basename
   sensor1

 1 Rows. -- 2 msec.
 SQL> SPARQL PREFIX base:  SELECT ?s {?s base:name "sensor1"};
 s
 LONG VARCHAR
 
 ___

 1

 1 Rows. -- 1 msec.
 SQL> SPARQL PREFIX base:  SELECT ?g ?s {GRAPH ?g {?s base:name
 "sensor1"}};
 g
s
 LONG VARCHAR
   LONG VARCHAR
 
 ___

 koh
1

 1 Rows. -- 1 msec.
 SQL>


 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 23 Jan 2018, at 09:58, Jason Koh  wrote:
 >
 > Hi Kingsley,
 >
 > Thanks for the prompt response. I just tried it and it works well. I
 haven't compared the performance yet but wish the string match is faster.
 >
 > However, I am having trouble querying with the String Literal with
 SPARQL. The following query does not work for Virtuoso.
 > ```sparql
 > select ?s {
 >   ?s base:name "sensor1". # also tried "sensor1"^^xsd:string but the
 same result.
 > }
 > ```
 > This query returns empty result.
 >
 > If I query with no pattern (?s ?p ?o), I can see the following triple:
 > : base:name "sensor1",
 >
 > Can't sort out the problem. Do you have any ideas on this?
 >
 > Thank you!
 >
 >
 >
 >
 >
 > With regards,
 > Jason Koh
 > cseweb.ucsd.edu/~jbkoh
 >
 > On Mon, Jan 22, 2018 at 2:52 PM, Kingsley Idehen <
 kide...@open

Re: [Virtuoso-users] Query optimization, possible indexing?

2018-01-23 Thread Jason Koh

Forgot to clarify the configuration:

Ubuntu 16.04 (64bit)
Virtuoso 7.2.4.2
Virtuoso Jean: virt_jena3
Virtuodo JDBC: virtjdbc4
Java: openjdk version "1.8.0_151"

Thank you.


With regards,
Jason Koh
cseweb.ucsd.edu/~jbkoh

On Tue, Jan 23, 2018 at 12:46 PM, Jason Koh  wrote:

> Here's the Java code snippet not working:
> ```java
> String nameStr = "test_sensor1";
> String BASE = "http://base.org#";;
> String uuid = "x";
> Node name = NodeFactory.createLiteralByValue(nameStr, XSDstring);
> Node point = NodeFactory.createURI(BASE + uuid);
> Node hasName = NodeFactory.createURI(BASE + "name");
> graph.add(new Triple(point, hasName, name));
> String qStr =
> "PREFIX base: \n" +
> "SELECT ?s WHERE {\n" +
> "?s base:name \"test_sensor1\" . \n" +
> "}";
> Query sparql = QueryFactory.create(qStr);
> VirtuosoQueryExecution vqd = VirtuosoQueryExecutionFactory.create(sparql,
> graph);
> ResultSet results = vqd.execSelect();
> while (results.hasNext()) {
>   QuerySolution result = results.nextSolution();
>   System.out.println(result.get("s").toString());
> }
> System.out.println("Done");
>   }
> ```
>
> The value ``results`` is empty and this code does not print anything. I
> can make a regenerator. Let me know if that helps.
>
>
> With regards,
> Jason Koh
> cseweb.ucsd.edu/~jbkoh
>
> On Tue, Jan 23, 2018 at 12:16 PM, Jason Koh  wrote:
>
>> Hi Hugh,
>>
>> I inserted the tripled through *Virtuoso Jena* and I can see triples like
>> ``ex:base:nametest_sensor0``
>> when I query just with ?s ?p ?o. However, I don't get any result with
>> ``?s base:name "test_sensor0"``.
>>
>> As you showed, it works with command line insertions. Let me verify the
>> source of the problem once again and come back.
>>
>> Thank you!
>>
>>
>> With regards,
>> Jason Koh
>> cseweb.ucsd.edu/~jbkoh
>>
>> On Tue, Jan 23, 2018 at 3:17 AM, Hugh Williams 
>> wrote:
>>
>>> Hi Jason,
>>>
>>> What exactly is not working for you ? As the following works for me:
>>>
>>> SQL> SPARQL PREFIX base:  INSERT DATA { GRAPH  { <1>
>>> base:name "sensor1" . } };
>>>
>>> Done. -- 1 msec.
>>> SQL> SPARQL SELECT * FROM  WHERE {?s ?p ?o};
>>> s
>>>  p
>>>o
>>> LONG VARCHAR
>>>   LONG VARCHAR
>>> LONG VARCHAR
>>> 
>>> ___
>>>
>>> 1
>>>  basename
>>> sensor1
>>>
>>> 1 Rows. -- 2 msec.
>>> SQL> SPARQL PREFIX base:  SELECT ?s {?s base:name "sensor1"};
>>> s
>>> LONG VARCHAR
>>> 
>>> ___
>>>
>>> 1
>>>
>>> 1 Rows. -- 1 msec.
>>> SQL> SPARQL PREFIX base:  SELECT ?g ?s {GRAPH ?g {?s base:name
>>> "sensor1"}};
>>> g
>>>  s
>>> LONG VARCHAR
>>>   LONG VARCHAR
>>> 
>>> ___
>>>
>>> koh
>>>  1
>>>
>>> 1 Rows. -- 1 msec.
>>> SQL>
>>>
>>>
>>> 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 23 Jan 2018, at 09:58, Jason Koh  wrote:
>>> >
>>> > Hi Kingsley,
>>> >
>>> > Thanks for the prompt response. I just tried it and it works well. I
>>> haven't compared the performance yet but wish the string match is faster.
>>> >
>>> > However, I am having trouble querying with the String Literal with
>>> SPARQL. The following query does not work for Virtuoso.
>>> > ```sparql
>>> > select ?s {
>>> >   ?s base:name "sensor1". # also tried "sensor1"^^xsd:string but the
>>> same result.
>>> > }
>>> > ```
>>> > This query returns empty result.
>>> >
>>> > If I query with no pattern (?s ?p ?o), I can see the following triple:
>>> > : base:name "sensor1",
>>> >
>>> > Can't sort out the problem. Do you have any ideas on this?
>>> >
>>> > Thank you!
>>> >
>>> >
>>> >
>>> >
>>> >
>>> > With regards,
>>> > Jason Koh
>>> > cseweb.ucsd.edu/~jbkoh
>>> >
>>> > On Mon, Jan 22, 2018 at 2:52 PM, Kingsley Idehen <
>>> kide...@openlinksw.com> wrote:
>>> > On 1/22/18 5:11 PM, Jason Koh wrote:
>>> >> Hi there,
>>> >>
>>> >> I am trying to use Virtuoso for metadata of city-scale sensor
>>> database. (metroinsight.io).
>>> >>
>>> >> I wonder if there is a way to optimize certain SPARQL query pattern.
>>> I often query this:
>>> >> ```sparql
>>> >> select ?s where {
>>> >>   ?s base:name ex:mySensor1 .
>>> >> }
>>> >> ```
>>> >>
>>> >> I could optimize it by caching those with Redis or else, but I wonder
>>> if I can force indexing "name" properties in Virtuoso.
>>> >>
>>> >> Thank you!
>>> >>
>>>

Re: [Virtuoso-users] Query optimization, possible indexing?

2018-01-23 Thread Jason Koh

Here's the Java code snippet not working:
```java
String nameStr = "test_sensor1";
String BASE = "http://base.org#";;
String uuid = "x";
Node name = NodeFactory.createLiteralByValue(nameStr, XSDstring);
Node point = NodeFactory.createURI(BASE + uuid);
Node hasName = NodeFactory.createURI(BASE + "name");
graph.add(new Triple(point, hasName, name));
String qStr =
"PREFIX base: \n" +
"SELECT ?s WHERE {\n" +
"?s base:name \"test_sensor1\" . \n" +
"}";
Query sparql = QueryFactory.create(qStr);
VirtuosoQueryExecution vqd = VirtuosoQueryExecutionFactory.create(sparql,
graph);
ResultSet results = vqd.execSelect();
while (results.hasNext()) {
  QuerySolution result = results.nextSolution();
  System.out.println(result.get("s").toString());
}
System.out.println("Done");
  }
```

The value ``results`` is empty and this code does not print anything. I can
make a regenerator. Let me know if that helps.


With regards,
Jason Koh
cseweb.ucsd.edu/~jbkoh

On Tue, Jan 23, 2018 at 12:16 PM, Jason Koh  wrote:

> Hi Hugh,
>
> I inserted the tripled through *Virtuoso Jena* and I can see triples like
> ``ex:base:nametest_sensor0``
> when I query just with ?s ?p ?o. However, I don't get any result with ``?s
> base:name "test_sensor0"``.
>
> As you showed, it works with command line insertions. Let me verify the
> source of the problem once again and come back.
>
> Thank you!
>
>
> With regards,
> Jason Koh
> cseweb.ucsd.edu/~jbkoh
>
> On Tue, Jan 23, 2018 at 3:17 AM, Hugh Williams 
> wrote:
>
>> Hi Jason,
>>
>> What exactly is not working for you ? As the following works for me:
>>
>> SQL> SPARQL PREFIX base:  INSERT DATA { GRAPH  { <1> base:name
>> "sensor1" . } };
>>
>> Done. -- 1 msec.
>> SQL> SPARQL SELECT * FROM  WHERE {?s ?p ?o};
>> s
>>  p
>>o
>> LONG VARCHAR
>> LONG VARCHAR
>>   LONG VARCHAR
>> 
>> ___
>>
>> 1
>>  basename
>> sensor1
>>
>> 1 Rows. -- 2 msec.
>> SQL> SPARQL PREFIX base:  SELECT ?s {?s base:name "sensor1"};
>> s
>> LONG VARCHAR
>> 
>> ___
>>
>> 1
>>
>> 1 Rows. -- 1 msec.
>> SQL> SPARQL PREFIX base:  SELECT ?g ?s {GRAPH ?g {?s base:name
>> "sensor1"}};
>> g
>>  s
>> LONG VARCHAR
>> LONG VARCHAR
>> 
>> ___
>>
>> koh
>>  1
>>
>> 1 Rows. -- 1 msec.
>> SQL>
>>
>>
>> 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 23 Jan 2018, at 09:58, Jason Koh  wrote:
>> >
>> > Hi Kingsley,
>> >
>> > Thanks for the prompt response. I just tried it and it works well. I
>> haven't compared the performance yet but wish the string match is faster.
>> >
>> > However, I am having trouble querying with the String Literal with
>> SPARQL. The following query does not work for Virtuoso.
>> > ```sparql
>> > select ?s {
>> >   ?s base:name "sensor1". # also tried "sensor1"^^xsd:string but the
>> same result.
>> > }
>> > ```
>> > This query returns empty result.
>> >
>> > If I query with no pattern (?s ?p ?o), I can see the following triple:
>> > : base:name "sensor1",
>> >
>> > Can't sort out the problem. Do you have any ideas on this?
>> >
>> > Thank you!
>> >
>> >
>> >
>> >
>> >
>> > With regards,
>> > Jason Koh
>> > cseweb.ucsd.edu/~jbkoh
>> >
>> > On Mon, Jan 22, 2018 at 2:52 PM, Kingsley Idehen <
>> kide...@openlinksw.com> wrote:
>> > On 1/22/18 5:11 PM, Jason Koh wrote:
>> >> Hi there,
>> >>
>> >> I am trying to use Virtuoso for metadata of city-scale sensor
>> database. (metroinsight.io).
>> >>
>> >> I wonder if there is a way to optimize certain SPARQL query pattern. I
>> often query this:
>> >> ```sparql
>> >> select ?s where {
>> >>   ?s base:name ex:mySensor1 .
>> >> }
>> >> ```
>> >>
>> >> I could optimize it by caching those with Redis or else, but I wonder
>> if I can force indexing "name" properties in Virtuoso.
>> >>
>> >> Thank you!
>> >>
>> >>
>> >> With regards,
>> >> Jason Koh
>> >> cseweb.ucsd.edu/~jbkoh
>> >
>> > Have you looked at text indexing in Virtuoso with regards to SPARQL?
>> > [1] http://docs.openlinksw.com/virtuoso/rdfsparqlrulefulltext/ .
>> > --
>> > Regards,
>> >
>> > Kingsley Idehen
>> > Founder & CEO
>> > OpenLink Software   (Home Page:
>> > http://www.openlinksw.com
>> > )
>> >
>> > Weblogs (Blogs):
>> > Legacy Blog:
>> > http://www.openlinksw.com/blog/~kidehen/
>> >
>> > Blogspot Blog:
>> > htt

Re: [Virtuoso-users] Query optimization, possible indexing?

2018-01-23 Thread Jason Koh

Hi Hugh,

I inserted the tripled through *Virtuoso Jena* and I can see triples like
``ex:base:nametest_sensor0``
when I query just with ?s ?p ?o. However, I don't get any result with ``?s
base:name "test_sensor0"``.

As you showed, it works with command line insertions. Let me verify the
source of the problem once again and come back.

Thank you!


With regards,
Jason Koh
cseweb.ucsd.edu/~jbkoh

On Tue, Jan 23, 2018 at 3:17 AM, Hugh Williams 
wrote:

> Hi Jason,
>
> What exactly is not working for you ? As the following works for me:
>
> SQL> SPARQL PREFIX base:  INSERT DATA { GRAPH  { <1> base:name
> "sensor1" . } };
>
> Done. -- 1 msec.
> SQL> SPARQL SELECT * FROM  WHERE {?s ?p ?o};
> s
>p
>  o
> LONG VARCHAR
> LONG VARCHAR
>   LONG VARCHAR
> 
> ___
>
> 1
>basename
>   sensor1
>
> 1 Rows. -- 2 msec.
> SQL> SPARQL PREFIX base:  SELECT ?s {?s base:name "sensor1"};
> s
> LONG VARCHAR
> 
> ___
>
> 1
>
> 1 Rows. -- 1 msec.
> SQL> SPARQL PREFIX base:  SELECT ?g ?s {GRAPH ?g {?s base:name
> "sensor1"}};
> g
>s
> LONG VARCHAR
> LONG VARCHAR
> 
> ___
>
> koh
>1
>
> 1 Rows. -- 1 msec.
> SQL>
>
>
> 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 23 Jan 2018, at 09:58, Jason Koh  wrote:
> >
> > Hi Kingsley,
> >
> > Thanks for the prompt response. I just tried it and it works well. I
> haven't compared the performance yet but wish the string match is faster.
> >
> > However, I am having trouble querying with the String Literal with
> SPARQL. The following query does not work for Virtuoso.
> > ```sparql
> > select ?s {
> >   ?s base:name "sensor1". # also tried "sensor1"^^xsd:string but the
> same result.
> > }
> > ```
> > This query returns empty result.
> >
> > If I query with no pattern (?s ?p ?o), I can see the following triple:
> > : base:name "sensor1",
> >
> > Can't sort out the problem. Do you have any ideas on this?
> >
> > Thank you!
> >
> >
> >
> >
> >
> > With regards,
> > Jason Koh
> > cseweb.ucsd.edu/~jbkoh
> >
> > On Mon, Jan 22, 2018 at 2:52 PM, Kingsley Idehen 
> wrote:
> > On 1/22/18 5:11 PM, Jason Koh wrote:
> >> Hi there,
> >>
> >> I am trying to use Virtuoso for metadata of city-scale sensor database.
> (metroinsight.io).
> >>
> >> I wonder if there is a way to optimize certain SPARQL query pattern. I
> often query this:
> >> ```sparql
> >> select ?s where {
> >>   ?s base:name ex:mySensor1 .
> >> }
> >> ```
> >>
> >> I could optimize it by caching those with Redis or else, but I wonder
> if I can force indexing "name" properties in Virtuoso.
> >>
> >> Thank you!
> >>
> >>
> >> With regards,
> >> Jason Koh
> >> cseweb.ucsd.edu/~jbkoh
> >
> > Have you looked at text indexing in Virtuoso with regards to SPARQL?
> > [1] http://docs.openlinksw.com/virtuoso/rdfsparqlrulefulltext/ .
> > --
> > Regards,
> >
> > Kingsley Idehen
> > Founder & CEO
> > OpenLink Software   (Home Page:
> > http://www.openlinksw.com
> > )
> >
> > Weblogs (Blogs):
> > Legacy Blog:
> > http://www.openlinksw.com/blog/~kidehen/
> >
> > Blogspot Blog:
> > http://kidehen.blogspot.com
> >
> > Medium Blog:
> > https://medium.com/@kidehen
> >
> >
> > Profile Pages:
> > Pinterest:
> > https://www.pinterest.com/kidehen/
> >
> > Quora:
> > https://www.quora.com/profile/Kingsley-Uyi-Idehen
> >
> > Twitter:
> > https://twitter.com/kidehen
> >
> > Google+:
> > https://plus.google.com/+KingsleyIdehen/about
> >
> > LinkedIn:
> > http://www.linkedin.com/in/kidehen
> >
> >
> > Web Identities (WebID):
> > Personal:
> > http://kingsley.idehen.net/public_home/kidehen/profile.ttl#i
> >
> > :
> > http://id.myopenlink.net/DAV/home/KingsleyUyiIdehen/Public/
> kingsley.ttl#this
> >
> >
> >
> >
> > 
> --
> > Check out the vibrant tech community on one of the world's most
> > engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> > ___
> > Virtuoso-users mailing list
> > Virtuoso-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/virtuoso-users
> >
> >
> > 
> --
> > Check out the vibrant tech community on one of the world's most
> > engaging tech sites, Slashdot.org! http://s

Re: [Virtuoso-users] Query optimization, possible indexing?

2018-01-23 Thread Hugh Williams

Hi Jason,

What exactly is not working for you ? As the following works for me:

SQL> SPARQL PREFIX base:  INSERT DATA { GRAPH  { <1> base:name 
"sensor1" . } };

Done. -- 1 msec.
SQL> SPARQL SELECT * FROM  WHERE {?s ?p ?o};
s   
  p 
o
LONG VARCHAR
  LONG VARCHAR  
LONG VARCHAR
___

1   
  basename  
sensor1

1 Rows. -- 2 msec.
SQL> SPARQL PREFIX base:  SELECT ?s {?s base:name "sensor1"};
s
LONG VARCHAR
___

1

1 Rows. -- 1 msec.
SQL> SPARQL PREFIX base:  SELECT ?g ?s {GRAPH ?g {?s base:name 
"sensor1"}};
g   
  s
LONG VARCHAR
  LONG VARCHAR
___

koh 
  1

1 Rows. -- 1 msec.
SQL>


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 23 Jan 2018, at 09:58, Jason Koh  wrote:
> 
> Hi Kingsley,
> 
> Thanks for the prompt response. I just tried it and it works well. I haven't 
> compared the performance yet but wish the string match is faster.
> 
> However, I am having trouble querying with the String Literal with SPARQL. 
> The following query does not work for Virtuoso.
> ```sparql
> select ?s {
>   ?s base:name "sensor1". # also tried "sensor1"^^xsd:string but the same 
> result.
> }
> ```
> This query returns empty result.
> 
> If I query with no pattern (?s ?p ?o), I can see the following triple:
> : base:name "sensor1",
> 
> Can't sort out the problem. Do you have any ideas on this?
> 
> Thank you!
> 
> 
> 
> 
> 
> With regards,
> Jason Koh
> cseweb.ucsd.edu/~jbkoh
> 
> On Mon, Jan 22, 2018 at 2:52 PM, Kingsley Idehen  
> wrote:
> On 1/22/18 5:11 PM, Jason Koh wrote:
>> Hi there,
>> 
>> I am trying to use Virtuoso for metadata of city-scale sensor database. 
>> (metroinsight.io).
>> 
>> I wonder if there is a way to optimize certain SPARQL query pattern. I often 
>> query this:
>> ```sparql
>> select ?s where {
>>   ?s base:name ex:mySensor1 .
>> }
>> ```
>> 
>> I could optimize it by caching those with Redis or else, but I wonder if I 
>> can force indexing "name" properties in Virtuoso. 
>> 
>> Thank you!
>> 
>> 
>> With regards,
>> Jason Koh
>> cseweb.ucsd.edu/~jbkoh
> 
> Have you looked at text indexing in Virtuoso with regards to SPARQL? 
> [1] http://docs.openlinksw.com/virtuoso/rdfsparqlrulefulltext/ .
> -- 
> Regards,
> 
> Kingsley Idehen 
> Founder & CEO 
> OpenLink Software   (Home Page: 
> http://www.openlinksw.com
> )
> 
> Weblogs (Blogs):
> Legacy Blog: 
> http://www.openlinksw.com/blog/~kidehen/
> 
> Blogspot Blog: 
> http://kidehen.blogspot.com
> 
> Medium Blog: 
> https://medium.com/@kidehen
> 
> 
> Profile Pages:
> Pinterest: 
> https://www.pinterest.com/kidehen/
> 
> Quora: 
> https://www.quora.com/profile/Kingsley-Uyi-Idehen
> 
> Twitter: 
> https://twitter.com/kidehen
> 
> Google+: 
> https://plus.google.com/+KingsleyIdehen/about
> 
> LinkedIn: 
> http://www.linkedin.com/in/kidehen
> 
> 
> Web Identities (WebID):
> Personal: 
> http://kingsley.idehen.net/public_home/kidehen/profile.ttl#i
> 
> : 
> http://id.myopenlink.net/DAV/home/KingsleyUyiIdehen/Public/kingsley.ttl#this
> 
> 
> 
> 
> --
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> ___
> Virtuoso-users mailing list
> Virtuoso-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/virtuoso-users
> 
> 
> --
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org! 
> http://sdm.link/slashdot___
> Virtuoso-users mailing list
> Virtuoso-users@lists.sourceforge

Re: [Virtuoso-users] Query optimization, possible indexing?

2018-01-23 Thread Jason Koh

Hi Kingsley,

Thanks for the prompt response. I just tried it and it works well. I
haven't compared the performance yet but wish the string match is faster.

However, I am having trouble querying with the String Literal with SPARQL.
The following query does not work for Virtuoso.
```sparql
select ?s {
  ?s base:name "sensor1". # also tried "sensor1"^^xsd:string but the same
result.
}
```
This query returns empty result.

If I query with no pattern (?s ?p ?o), I can see the following triple:
: base:name "sensor1",

Can't sort out the problem. Do you have any ideas on this?

Thank you!





With regards,
Jason Koh
cseweb.ucsd.edu/~jbkoh

On Mon, Jan 22, 2018 at 2:52 PM, Kingsley Idehen 
wrote:

> On 1/22/18 5:11 PM, Jason Koh wrote:
>
> Hi there,
>
> I am trying to use Virtuoso for metadata of city-scale sensor database. (
> metroinsight.io).
>
> I wonder if there is a way to optimize certain SPARQL query pattern. I
> often query this:
> ```sparql
> select ?s where {
>   ?s base:name ex:mySensor1 .
> }
> ```
>
> I could optimize it by caching those with Redis or else, but I wonder if I
> can force indexing "name" properties in Virtuoso.
>
> Thank you!
>
>
> With regards,
> Jason Koh
> cseweb.ucsd.edu/~jbkoh 
>
>
> Have you looked at text indexing in Virtuoso with regards to SPARQL?
>
> [1] http://docs.openlinksw.com/virtuoso/rdfsparqlrulefulltext/ .
>
> --
> Regards,
>
> Kingsley Idehen   
> Founder & CEO
> OpenLink Software   (Home Page: http://www.openlinksw.com)
>
> Weblogs (Blogs):
> Legacy Blog: http://www.openlinksw.com/blog/~kidehen/
> Blogspot Blog: http://kidehen.blogspot.com
> Medium Blog: https://medium.com/@kidehen
>
> Profile Pages:
> Pinterest: https://www.pinterest.com/kidehen/
> Quora: https://www.quora.com/profile/Kingsley-Uyi-Idehen
> Twitter: https://twitter.com/kidehen
> Google+: https://plus.google.com/+KingsleyIdehen/about
> LinkedIn: http://www.linkedin.com/in/kidehen
>
> Web Identities (WebID):
> Personal: http://kingsley.idehen.net/public_home/kidehen/profile.ttl#i
> : 
> http://id.myopenlink.net/DAV/home/KingsleyUyiIdehen/Public/kingsley.ttl#this
>
>
> 
> --
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> ___
> Virtuoso-users mailing list
> Virtuoso-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/virtuoso-users
>
>
--
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot___
Virtuoso-users mailing list
Virtuoso-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/virtuoso-users

Re: [Virtuoso-users] Query optimization, possible indexing?

2018-01-22 Thread Kingsley Idehen

On 1/22/18 5:11 PM, Jason Koh wrote:
> Hi there,
>
> I am trying to use Virtuoso for metadata of city-scale sensor
> database. (metroinsight.io ).
>
> I wonder if there is a way to optimize certain SPARQL query pattern. I
> often query this:
> ```sparql
> select ?s where {
>   ?s base:name ex:mySensor1 .
> }
> ```
>
> I could optimize it by caching those with Redis or else, but I wonder
> if I can force indexing "name" properties in Virtuoso. 
>
> Thank you!
>
>
> With regards,
> Jason Koh
> cseweb.ucsd.edu/~jbkoh 


Have you looked at text indexing in Virtuoso with regards to SPARQL?

[1] http://docs.openlinksw.com/virtuoso/rdfsparqlrulefulltext/ .

-- 
Regards,

Kingsley Idehen   
Founder & CEO 
OpenLink Software   (Home Page: http://www.openlinksw.com)

Weblogs (Blogs):
Legacy Blog: http://www.openlinksw.com/blog/~kidehen/
Blogspot Blog: http://kidehen.blogspot.com
Medium Blog: https://medium.com/@kidehen

Profile Pages:
Pinterest: https://www.pinterest.com/kidehen/
Quora: https://www.quora.com/profile/Kingsley-Uyi-Idehen
Twitter: https://twitter.com/kidehen
Google+: https://plus.google.com/+KingsleyIdehen/about
LinkedIn: http://www.linkedin.com/in/kidehen

Web Identities (WebID):
Personal: http://kingsley.idehen.net/public_home/kidehen/profile.ttl#i
: 
http://id.myopenlink.net/DAV/home/KingsleyUyiIdehen/Public/kingsley.ttl#this



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Re: [Virtuoso-users] Query optimization, possible indexing?

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