This HTML5 document contains 75 embedded RDF statements represented using HTML+Microdata notation.

The embedded RDF content will be recognized by any processor of HTML5 Microdata.

Subject Item

n2:VirtGraphReplicationBiDirectional

rdf:type

atom:Entry sioct:Comment

dcterms:created

2017-06-13T05:44:55.879709

dcterms:modified

2017-06-13T05:44:55.879709

rdfs:label

VirtGraphReplicationBiDirectional

foaf:maker

n44:this n46:this

dc:title

VirtGraphReplicationBiDirectional

opl:isDescribedUsing

n24:rdf

sioc:has_creator

n29:this n66:this

sioc:attachment

n4:png n6:png n7:png n8:png n9:png n10:png n11:png n12:png n13:png n14:png n16:png n19:png n20:png n21:png n22:png n28:png n30:graffle n31:png n32:png n34:png n35:png n30:png n36:png n37:png n38:png n39:png n47:png n48:png n49:png n51:png n52:png n53:png n54:png n55:png n57:png n58:png n59:png n60:png n62:png n63:png n64:png n65:png n67:png

sioc:content

%META:TOPICPARENT{name="VirtGraphReplication"}% ---+ Replication Example: 2-node Bi-directional Topology %TOC% ---++ Introduction The following Guide demonstrates the Virtuoso RDF Bi-directional Graph Replication, e.g., %BR%%BR%<img src="%ATTACHURLPATH%/topo-bidirectional.png" />%BR%%BR% ---++Prerequisites ---+++Database INI Parameters Suppose there are 2 Virtuoso instances respectively with the following ini parameters values: 1. virtuoso1.ini: <verbatim> ... [Database] DatabaseFile = virtuoso1.db TransactionFile = virtuoso1.trx ErrorLogFile = virtuoso1.log ... [Parameters] ServerPort = 1111 SchedulerInterval = 1 ... [HTTPServer] ServerPort = 8891 ... [URIQA] DefaultHost = localhost:8891 ... [Replication] ServerName = db1 ... </verbatim> 1. virtuoso2.ini: <verbatim> ... [Database] DatabaseFile = virtuoso2.db TransactionFile = virtuoso2.trx ErrorLogFile = virtuoso2.log ... [Parameters] ServerPort = 1112 SchedulerInterval = 1 ... [HTTPServer] ServerPort = 8892 ... [URIQA] DefaultHost = localhost:8892 ... [Replication] ServerName = db2 ... </verbatim> ---+++Database DSNs Use the ODBC Administrator on your Virtuoso host (e.g., on Windows, *Start* menu -> *Control Panel* -> *Administrative Tools* -> <b>Data Sources (ODBC)</b>; on Mac OS X, <code><nowiki>/Applications/Utilities/OpenLink ODBC Administrator.app</nowiki></code>) to create a System DSN for db1 and db2 with names db1 and db2 respectively. ---+++Install Conductor package On each of the 2 Virtuoso instances install the [[http://s3.amazonaws.com/opldownload/uda/vad-packages/6.1/virtuoso/conductor_dav.vad][conductor_dav.vad]] package. ---++Create Publication on db2 1. Go to http://localhost:8892/conductor and log in as dba 1. Go to Conductor -> Replication -> Transactional -> Publications %BR%%BR%<img src="%ATTACHURLPATH%/bd1.png" />%BR%%BR% 1. Click <b>Enable RDF Publishing</b> 1 As result publication with the name <b>RDF Publication</b> should be created %BR%%BR%<img src="%ATTACHURLPATH%/bd2.png" />%BR%%BR% 1 Click the link which is the publication name. 1 You will be shown the publication items page %BR%%BR%<img src="%ATTACHURLPATH%/bd3.png" />%BR%%BR% 1 Enter for Graph IRI: <verbatim> http://example.org </verbatim> %BR%%BR%<img src="%ATTACHURLPATH%/bd4.png" />%BR%%BR% 1 Click Add New 1 The item will be created and shown in the list of items for the currently viewed publication. %BR%%BR%<img src="%ATTACHURLPATH%/bd5.png" />%BR%%BR% ---++Create subscription from db1 to db2's Publication 1 Log in at http://localhost:8891/conductor 1 Go to Replication -> Transactional -> Subscriptions %BR%%BR%<img src="%ATTACHURLPATH%/bd6.png" />%BR%%BR% 1 Click <b>New Subscription</b> %BR%%BR%<img src="%ATTACHURLPATH%/bd7.png" />%BR%%BR% 1 From the list of "Specify new data source" select Data Source db2 %BR%%BR%<img src="%ATTACHURLPATH%/bd8.png" />%BR%%BR% 1 Enter for db2 dba user credentials %BR%%BR%<img src="%ATTACHURLPATH%/bd9.png" />%BR%%BR% 1 Click "Add Data Source" 1 As result <b>db2</b> will be shown in the "Connected Data Sources" list. %BR%%BR%<img src="%ATTACHURLPATH%/bd10.png" />%BR%%BR% 1 Select <b>db2</b> the "Connected Data Sources" list and click "Publications list" %BR%%BR%<img src="%ATTACHURLPATH%/bd11.png" />%BR%%BR% 1 As result will be shown the list of available publications for the selected data source. Select the one with name "RDF Publication" and click "List Items". %BR%%BR%<img src="%ATTACHURLPATH%/bd12.png" />%BR%%BR% 1 As result will be shown the "Confirm subscription" page. %BR%%BR%<img src="%ATTACHURLPATH%/bd13.png" />%BR%%BR% 1 The sync interval by default is 10 minutes. For the testing purposes, we will change it to 1 minute. %BR%%BR%<img src="%ATTACHURLPATH%/bd14.png" />%BR%%BR% 1 Click "Subscribe" 1 The subscription will be created. %BR%%BR%<img src="%ATTACHURLPATH%/bd15.png" />%BR%%BR% ---++Create Publication on db1 1. Go to http://localhost:8891/conductor and log in as dba 1. Go to Conductor -> Replication -> Transactional -> Publications %BR%%BR%<img src="%ATTACHURLPATH%/bd16.png" />%BR%%BR% 1. Click <b>Enable RDF Publishing</b> 1 As result publication with the name <b>RDF Publication</b> should be created %BR%%BR%<img src="%ATTACHURLPATH%/bd17.png" />%BR%%BR% 1 Click the link which is the publication name. 1 You will be shown the publication items page %BR%%BR%<img src="%ATTACHURLPATH%/bd18.png" />%BR%%BR% 1 Enter for Graph IRI: <verbatim> http://example.org </verbatim> %BR%%BR%<img src="%ATTACHURLPATH%/bd19.png" />%BR%%BR% 1 Click Add New 1 The item will be created and shown in the list of items for the currently viewed publication. %BR%%BR%<img src="%ATTACHURLPATH%/bd20.png" />%BR%%BR% ---++Create subscription from db2 to db1's Publication 1 Log in at http://localhost:8892/conductor 1 Go to Replication -> Transactional -> Subscriptions %BR%%BR%<img src="%ATTACHURLPATH%/bd21.png" />%BR%%BR% 1 Click <b>New Subscription</b> %BR%%BR%<img src="%ATTACHURLPATH%/bd22.png" />%BR%%BR% 1 From the list of "Specify new data source" select Data Source db1 %BR%%BR%<img src="%ATTACHURLPATH%/bd23.png" />%BR%%BR% 1 Enter for db1 dba user credentials %BR%%BR%<img src="%ATTACHURLPATH%/bd24.png" />%BR%%BR% 1 Click "Add Data Source" %BR%%BR%<img src="%ATTACHURLPATH%/bd25.png" />%BR%%BR% 1 As result <b>db1</b> will be shown in the "Connected Data Sources" list. Select it and click "Publications list" %BR%%BR%<img src="%ATTACHURLPATH%/bd26.png" />%BR%%BR% 1 As result will be shown the list of available publications for the selected data source. Select the one with name "RDF Publication" and click "List Items". %BR%%BR%<img src="%ATTACHURLPATH%/bd27.png" />%BR%%BR% 1 As result will be shown the "Confirm subscription" page. %BR%%BR%<img src="%ATTACHURLPATH%/bd28.png" />%BR%%BR% 1 The sync interval by default is 10 minutes. For the testing purposes, we will change it to 1 minute. %BR%%BR%<img src="%ATTACHURLPATH%/bd29.png" />%BR%%BR% 1 Click "Subscribe" 1 The subscription will be created. %BR%%BR%<img src="%ATTACHURLPATH%/bd30.png" />%BR%%BR% ---++Insert Data into a Named Graph on the db2 Virtuoso Instance 1. Log in at http://localhost:8892/conductor 1 Go to Linked Data -> Quad Store Upload %BR%%BR%<img src="%ATTACHURLPATH%/bd31.png" />%BR%%BR% 1 In the shown form: 1 Tick the box for <b>Resource URL</b> and enter your resource URL, e.g.: <verbatim> http://www.openlinksw.com/dataspace/person/kidehen@openlinksw.com#this </verbatim> 1 Enter for Named Graph IRI: <verbatim> http://example.org </verbatim> %BR%%BR%<img src="%ATTACHURLPATH%/bd32.png" />%BR%%BR% 1 Click Upload 1 A successful upload will result in a shown message. %BR%%BR%<img src="%ATTACHURLPATH%/bd33.png" />%BR%%BR% 1 Check the count of the inserted triples by executing a query like the following against the SPARQL endpoint, http://localhost:8892/sparql: <verbatim> SELECT COUNT(*) FROM <http://example.org> WHERE { ?s ?p ?o } </verbatim> %BR%%BR%<img src="%ATTACHURLPATH%/bd34.png" />%BR%%BR% 1 Should return <b>57</b> as total. %BR%%BR%<img src="%ATTACHURLPATH%/bd35.png" />%BR%%BR% ---++Check data on the Destination instance db1 1 To check the starting count, execute from db1's SPARQL Endpoint: <verbatim> SELECT COUNT(*) FROM <http://example.org> WHERE { ?s ?p ?o } </verbatim> 1 Should return <b>57</b> as total. %BR%%BR%<img src="%ATTACHURLPATH%/bd35.png" />%BR%%BR% ---++Add new data on db2 1 Disconnect db1. 1 On the Host Virtuoso Instance db2 go to Conductor -> Database -> Interactive SQL enter the following statement: <verbatim> SPARQL INSERT INTO GRAPH <http://example.org> { <http://www.openlinksw.com/dataspace/person/kidehen@openlinksw.com#this> <http://xmlns.com/foaf/0.1/interest> <http://dbpedia.org/resource/Web_Services> } ; </verbatim> %BR%%BR%<img src="%ATTACHURLPATH%/bd36.png" />%BR%%BR% 1 Click "Execute" 1 As result the triples will be inserted %BR%%BR%<img src="%ATTACHURLPATH%/bd37.png" />%BR%%BR% 1 Check the count of the destination instance graph's triples by executing the following query like against the SPARQL endpoint, http://localhost:8892/sparql: <verbatim> SELECT COUNT(*) FROM <http://example.org> WHERE { ?s ?p ?o } </verbatim> 1 Should return <b>58</b> as total. %BR%%BR%<img src="%ATTACHURLPATH%/bd38.png" />%BR%%BR% ---++Check data on the Destination instance db1 1 Start instance db1 1 To confirm that the triple count has increased by the number of inserted triples, execute the following statement on db1's SPARQL Endpoint: <verbatim> SELECT COUNT(*) FROM <http://example.org> WHERE { ?s ?p ?o } </verbatim> 1 Should return <b>58</b> as total. %BR%%BR%<img src="%ATTACHURLPATH%/bd38.png" />%BR%%BR% ---++Add new data on db1 1 Disconnect db2. 1 On the Host Virtuoso Instance db1 go to Conductor -> Database -> Interactive SQL enter the following statement: <verbatim> SPARQL INSERT INTO GRAPH <http://example.org> { <http://www.openlinksw.com/dataspace/person/kidehen@openlinksw.com#this> <http://xmlns.com/foaf/0.1/interest> <http://dbpedia.org/resource/Web_Clients> } ; SPARQL INSERT INTO GRAPH <http://example.org> { <http://www.openlinksw.com/dataspace/person/kidehen@openlinksw.com#this> <http://xmlns.com/foaf/0.1/interest> <http://dbpedia.org/resource/SPARQL> } ; </verbatim> %BR%%BR%<img src="%ATTACHURLPATH%/bd39.png" />%BR%%BR% 1 Click "Execute" 1 As result the triples will be inserted %BR%%BR%<img src="%ATTACHURLPATH%/bd40.png" />%BR%%BR% 1 Check the count of the destination instance graph's triples by executing the following query like against the SPARQL endpoint, http://localhost:8891/sparql: <verbatim> SELECT COUNT(*) FROM <http://example.org> WHERE { ?s ?p ?o } </verbatim> 1 Should return <b>60</b> as total. %BR%%BR%<img src="%ATTACHURLPATH%/bd41.png" />%BR%%BR% ---++Check data on the Destination instance db2 1 Start instance db2 1 To confirm that the triple count has increased by the number of inserted triples, execute the following statement on db2's SPARQL Endpoint: <verbatim> SELECT COUNT(*) FROM <http://example.org> WHERE { ?s ?p ?o } </verbatim> 1 Should return <b>60</b> as total. %BR%%BR%<img src="%ATTACHURLPATH%/bd41.png" />%BR%%BR% ---++Related * [[VirtGraphReplicationStar][Replication Example: Star Topology]] * [[VirtGraphReplicationChain][Replication Example: Chain Topology]] * [[VirtGraphReplicationPSQL][Set up RDF Replication via procedure calls]] * [[http://ods.openlinksw.com/wiki/ODS/VirtPubSubHub][Example of Linked Data Usage of PubSubHubbub Implementation]] * [[VirtRdfReplScenarios][Exploit Virtuoso's Replication Functionality Web based Solutions]]

sioc:id

d0699e287925b92514e0bbfaaeae44a0

sioc:link

n2:VirtGraphReplicationBiDirectional

sioc:has_container

n15:VOS

n17:has_services

n18:item

atom:title

VirtGraphReplicationBiDirectional

sioc:links_to

n5:vad n26:VirtPubSubHub n27: n40:VirtRdfReplScenarios n41:conductor n40:VirtGraphReplicationPSQL n40:VirtGraphReplicationStar n2:VirtGraphReplicationChain n50: n56:conductor

atom:source

n15:VOS

atom:author

n46:this

atom:published

2017-06-13T05:44:55Z

atom:updated

2017-06-13T05:44:55Z

sioc:topic

n15:VOS