Semantic Technologies :: Convert Application From Jena TDB To Oracle
Jul 23, 2013
We want to convert our application from Jena TDB to Oracle. In our ontology there are 40.000 triples. Oracle takes 6.8 sec. while Jena TDB takes 0.59 sec. Oracle is much slower than jena TDB. You can see both codes below. There are no inferencing for both apps. How can I improve the performance of Oracle?
Both applications and their data sources are running on same machine.
Oracle code:Oracle oracle = new Oracle(szJdbcURL, szUser, szPasswd); Attachment attachment1 = Attachment.createInstance( new String[] { szSchemaName, szImpactName }, new String[] { }, InferenceMaintenanceMode.NO_UPDATE, QueryOptions.DEFAULT); graph1 = new Graph Oracle Sem(oracle, szModelName, attachment1);m = new ModelOracleSem(graph1); listSubclass = m.listStatements(null,)
[code]....
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Jul 19, 2012
I was trying to execute a SPARQL through Jena API. I am getting the following exception when invoking the
"ResultSetFormatter.out(System.out, results);" method.
I connect to Oracle using the following Jena code
============================================
Oracle oracle = new Oracle(szJdbcURL, szUser, szPasswd);
Model model = ModelOracleSem.createOracleSemModel(
oracle, szModelName);
==============================================
This is the exception I am getting.
java.lang.NullPointerException
at oracle.spatial.rdf.client.jena.OracleRepeatApply.nextStage(OracleRepeatApply.java:794)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIterRepeatApply.makeNextStage(QueryIterRepeatApply.java:101)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIterRepeatApply.hasNextBinding(QueryIterRepeatApply.java:53)
[code].....
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Apr 17, 2013
I'm new in the group and no have much experience in Spatial area.
I'm looking for information about the posibility of use google places apis to get point of interest from Oracle Spatial / MapBuilder / MapViewer in order to use point of interest from google with own spatial information.
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Oct 13, 2013
I am using Oracle 12c Spatial and Graph and I would like to retrieve the nearest neighbors of a point from a dataset encoded according to GeoSPARQL.I have created a spatial index on the datatype geo:wktLiteral and I to the query so the optimizer pick a plan using the index RDF_V$GEO_IDX. The query I pose is the following:
SELECT geo, wkt
FROM TABLE(SEM_MATCH('
PREFIX geo: <http://www.opengis.net/ont/geosparql#>
SELECT ?geo ?wkt
[code]...
I do not get any error but I do not get any results neither. However, there are a lot of points around POINT(22.39 38.25) in my dataset and if I remove the filter I get results.Do I use orageo:nearestNeighbor in a wrong way?
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Apr 28, 2013
can i create the user-defined functions and use them in the FILTER clause in the sem_match function? there are some built-in functions for the FILTER clasue. however, only one function (DATATYPE(literal)) support for date/time in the built-in functions. i want to implement some user-defined funcitons in the FILTER clause which can check time intervals in ontology. there are some functions about valid time in the WorkSpace Manager such as WM_OVERLAPS, WM_CONTAINS,WM_MEETS, etc. so, can i write some functions using the these valid time functions in WM and use them in the FILTER clause?
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Mar 7, 2013
I'm currently doing migration from Oracle 10gR2 RDF to Oracle 11gR2 Semantic Technology.I followed the steps on the documentation and successfully created the network using the following:
-----
EXECUTE SEM_APIS.CREATE_SEM_NETWORK('rdf_tblspace');
CREATE TABLE rdf_network_trace (id NUMBER, triple SDO_RDF_TRIPLE_S);
--Created SEQUENCE andTRIGGER FOR rdf_network_trace id
[code]....
when I looked at my Node Ids, they were like +635762253807433724+, +6118969225776891730+. The problem is, I am not the one who is assigning Node Ids, They were automatically generated when inserting TRIPLE data to the rdf table.
Did I miss something when I created my network?
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Dec 22, 2012
I got an exception when I was using sesame adapter to dump a turtle file which contains long texts as objects into oracle semantic database. The exception information is:
org.openrdf.repository.RepositoryException: org.openrdf.sail.SailException: java.sql.SQLException: ORA-01461: can bind a LONG value only for insert into a LONG column
ORA-06512: in "SF.ORACLE_ORARDF_ADDHELPER", line 1
ORA-06512: in line 1
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:439)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:395)
at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:802) ...
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Apr 26, 2013
I am developing android application connected to Oracle database using PHP, and I use PL/SQL statements with semantic technologies provided in Oracle(specifically, SEM_MATCH, SEM_MODELS, SEM_RULEBASES or something like this).
However, it doesn't work properly...the connection between android and Oracle works well, though. Also, the query statement is implemented well in the sql developer.The whole php code is shown below :
*<?php*
function db_connect()
*{*
*$db = "(DESCRIPTION=(ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 203.249.105.20)(PORT = 1521)))(CONNECT_DATA=(SID=orcl)))";*
[code]...
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Jun 4, 2013
The first problem I want to solve is to convert the application ID in an url to an Alias name eg: helpdesk for an help desk application. Instead of referencing the apex application by id, I want to type the alias name on the url. example url: [URL]: I want this to be [URL]
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May 9, 2013
I need to converte apex app in welsh language and welsh is supported by apex.What other alternative we take apart from Apex default language translation.
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Mar 15, 2011
I have a small application with 5 forms and a small database. Is it possible to convert it into an exe file?
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Sep 13, 2012
I have a BI Suite implementation on one server. And a database with ApEx on another server.
I want to call a BIP report from within my ApEx application using the webservices (runReport) available in BIP 11g.
I used soapUI to test my webservice. Result : OK
When called from within ApEx, ApEx gives me a succes message but the report isn't generated. Instead the console on the BIP server shows the following error:
<Sep 12, 2012 10:28:37 PM BST> <Error> <org.apache.axis.encoding.ser.BeanPropert
yTarget> <BEA-000000> <Could not convert null to bean field 'sizeOfDataChunkDown
load', type int>
'sizeOfDataChunkDownload' is a field of the webservice that is left empty. That indeed is the only difference between my soapUI test and the ApEx situation. In soapUI I removed all empty fields. In ApEx this does not seem possible...
Some extra information:
- the webservice is created on this WSDL : /xmlpserver/services v2/ReportService?wsdl
- it's defined as a SOAP v2
- no basic authentication
- the reports are defined in the BIP environment; not in ApEx
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Nov 17, 2012
Given:
- Apex 4.2
- Application Theme: Bluejay-22
- Page Template Class: Two Level Tabs
Required:
- Convert 2nd Level Tabs of (Bluejay-22 Theme) to be Drop-Down Menus as in (Application Builder Theme)
- Where can I find documentation for app_AppMenuMultiOpenBottom3
Current Situation
- Only the first level tabs are converted to match the (Application Builder Theme).
- The Drop-Down menus of the second level tabs are not working
Steps tried
1) link the following CSS's into the Header section of the Page Template of (Bluejay-22)
<link rel="stylesheet" href="/i/css/apex_builder.min.css?v=4.2.0.00.27" type="text/css" />
<link rel="stylesheet" href="/i/css/apex_ui.min.css?v=4.2.0.00.27" type="text/css" />
<link rel="stylesheet" href="/i/css/apex_ui_builder_home.css" type="text/css" />2) link the following Scripts into the Header section of the Page Template
<script type="text/javascript">
[code].....
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Oct 5, 2012
I have 11gR2 GI installed on two nodes. I am trying to convert a 10g single instance (uses ASM) database to RAC and getting this error. I am trying using 12c as well as manually by using rconfig.
[main] [21:19:15:145] [ASMInstance.initialize:135] First record =[Ljava.lang.String;@958bb8
java.lang.NullPointerException
at oracle.sysman.assistants.rconfig.engine.ASMInstance.initialize(ASMInstance.java:153)
at oracle.sysman.assistants.rconfig.engine.Step.execute(Step.java:283)
[code]...
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Nov 16, 2006
I have to change some queries from SQL to Oracle but I couldn't convert these queries because they use some system tables in SQL that I don't know the equivalent Oracle tables. Following are SQL Queries
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May 29, 2012
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this is my T-SQL query,
ALTER PROCEDURE dbo.PRO_SELECT_CERTIFICATION_Accreditations
AS
BEGIN
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FROM[Accreditations]
END
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Oct 28, 2011
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current_end_time TIMESTAMP,
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current_duration int
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Apr 11, 2011
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I need to convert oracle joins to ANSI joins. I have tried below
update (select t1.name as t1_name,t2.name as t2_name
from merge_st t1 lef outer join merge_st t2
on(t1.id=t2.id))
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May 30, 2011
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Feb 20, 2012
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Step 1)
Table Name: Rat_table
------------------------------------------
Column : year and rating_name
year rating_name
------ -----------
2011 'Sucessful'
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Step 2)
Table Name: Rat_table
------------------------------------------
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Oct 24, 2013
How to convert Oracle 10g Forms to Oracle 6i Forms ?
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Sep 26, 2012
I have Table like
ID |A |B |C
---------------------------------------------------
4 |0000 |ALL |6
7 |0000 |ALL |3
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ID |ColumnName |Value
-------------------------------
4 |A |0000
4 |B |ALL
4 |C |6
7 |A |0000
7 |B |ALL
7 |C |3
8 |A |TEST
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in oracle 11g we have the option call pivot and unpivot but i dont know how achive this in 10g.
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May 15, 2013
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Jun 28, 2011
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Jul 10, 2011
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Nov 28, 2011
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Oct 8, 2010
I'm converting a SQL Server db to Oracle 10g. So far it's going pretty well. However, I've hit a significant performance snag trying to run queries against the converted view whose SQL is below. In SQL Server it runs pretty quickly, 10-15 secs. This query presently returns about 1.7 million records. code below, and assuming I've done nothing to optimize the database or the objects involved,
BS
------------------
CREATE VIEW DST_TMP_VIEW_ACCT_XACTN_CRN AS
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FUNDID,
[code]...
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Sep 20, 2012
I am using oracle database 9iR2 (9.2.0.8) on windows 2003 server.
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ENAME
--------
SMITH
ALLEN
WARD
JONES
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KING
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Nov 10, 2012
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