Re: many named graphs
Hi Guys! I guess the real answer is that the Named Graph / Uesr-ID should be generated via Jena and then it can be referenced (used) in Sparql via wrapper creation and usage programming... I will also review the use of URN's in Sparql... Thank you for your help... Al On Friday, July 8, 2016 12:55 AM, Andy Seaborne wrote: You can prepend a string to make it a URI. http:/example/U001 http:/example/user?id=U001 or even don't do that but allocate a unique for all time URI for this user instance and user:id "U001" ; foaf:name "Al Shapiro" ; foaf:birthday "2016-07-08"^^xsd:dateTime . and separately hold in a safe a table: urn:uuid:f2504c02-2b2b-11b2-807f-024225278a43 PASSWORD The user never see the URN. Storing the password separately is for security. URNs can be uniquely generated safely with no practical risk of collision across multiple machines. SPARQL even has support for it. Andy On 08/07/16 08:26, Lorenz B. wrote: > Hello Al, > > I do not understand why it is so difficult for you to generate some IRIs > for a users that have an ID. Just use your own namespace and append the > ID. And generating graphs depends on the triple store that you use. In > Jena for instance, you could use some methods of the Dataset [1], like > addNamedModel() > > [1] > https://jena.apache.org/documentation/javadoc/arq/org/apache/jena/query/Dataset.html > > Kind regards, > Lorenz > >> A. Soroka, >> >> The syntactical form of my user id values, is a variable containing >> "U001" through "U999" - the user id is assigned when an end-user >> first logs on to the system, with their e-mail and password - as long as the >> account is valid, the end-user retains the same user id assigned to it when >> they first logged on (registered)... >> >> I still need to know how to generate the Named Graph based on IRI, etc? >> >> Thank you, >> Al >> >> On Thursday, July 7, 2016 6:25 AM, A. Soroka wrote: >> >> >> What is the syntactical form of your user id values? >> >> --- >> A. Soroka >> The University of Virginia Library >> >>> On Jul 6, 2016, at 10:14 PM, Al Shapiro wrote: >>> >>> Daniel, >>> I want to create a Named Graph "X", based on User-Id, the data for each >>> named Graph is created on the fly, when a Match occurs against the Default >>> Graph (which has already been loaded to the Jena TDB)... >>> I need to know how to generate the Named Graph based on IRI? >>> Do I create a NameSpace for the IRI? >>> Please give me an example... >>> Thank you, >>> Al >>> >>> On Wednesday, July 6, 2016 6:45 AM, Daniel Hernández >>>wrote: >>> >>> >>> I suggest that you first translate your data to RDF using an script >>> (e.g., in Ruby, Python, etc.) to generate a text file in one of the RDF >>> serialization formats that support named graphs (e.g., nquads). Then, >>> you can load the data into jena using tdbloader. >>> >>> Daniel >>> >>> El 06/07/16 a las 01:10, Al Shapiro escribió: Daniel, Thank you, this gives me part of the answer... Can you give me an example(s) of the IRI's that you used to name your Named Graphs and how they are defined as an IRI, in Sparql?. Please withhold any proprietary info... Thank you again, Al On Tuesday, July 5, 2016 9:55 PM, Daniel Hernández wrote: Hi Al, Yes, you can use any IRI to name graphs. Thus, in particular you can use user ids to compose names of graphs. Daniel El 05/07/16 a las 23:58, Al Shapiro escribió: > Hi Daniel, > I am a Newbie at Jena Sparql and I would like to know how you addressed > the value of each Named Graph you created, for example, I have > successfully used GRAPH qm:g1 to create a Named Graph "g1", can I > substitute a variable for "g1" such as "user _number", to create multiple > Named Graphs based on the value of "user _number"? > Thank you for help... > Al > > > > > > > > > On Monday, July 4, 2016 8:38 PM, Daniel Hernández > wrote: > > > Hi Chris, > > It is possible. In fact, I have loaded 57 million of named graphs and > then queried without problem. You can see the details in > http://users.dcc.uchile.cl/~dhernand/research/ssws-2015-reifying.pdf > > Daniel > > El 04/07/16 a las 19:21, Chris Jones escribió: >> Hi All, >> >> How many named graphs can Jena gracefully handle? Hundreds, thousands, >> millions? I've found references to Jena handling large triple stores, >> with billions of statements; but nothing about how many named graphs. >> >> I'm writing a system where I'm considering giving each remote client >> its own named graph where it uploads data. I'm further considering >> keeping historical data, so the client would get a new named graph >> each time it sent its data. I'm curious if this is
Re: many named graphs
You can prepend a string to make it a URI. http:/example/U001 http:/example/user?id=U001 or even don't do that but allocate a unique for all time URI for this user instance and user:id "U001" ; foaf:name "Al Shapiro" ; foaf:birthday "2016-07-08"^^xsd:dateTime . and separately hold in a safe a table: urn:uuid:f2504c02-2b2b-11b2-807f-024225278a43 PASSWORD The user never see the URN. Storing the password separately is for security. URNs can be uniquely generated safely with no practical risk of collision across multiple machines. SPARQL even has support for it. Andy On 08/07/16 08:26, Lorenz B. wrote: Hello Al, I do not understand why it is so difficult for you to generate some IRIs for a users that have an ID. Just use your own namespace and append the ID. And generating graphs depends on the triple store that you use. In Jena for instance, you could use some methods of the Dataset [1], like addNamedModel() [1] https://jena.apache.org/documentation/javadoc/arq/org/apache/jena/query/Dataset.html Kind regards, Lorenz A. Soroka, The syntactical form of my user id values, is a variable containing "U001" through "U999" - the user id is assigned when an end-user first logs on to the system, with their e-mail and password - as long as the account is valid, the end-user retains the same user id assigned to it when they first logged on (registered)... I still need to know how to generate the Named Graph based on IRI, etc? Thank you, Al On Thursday, July 7, 2016 6:25 AM, A. Soroka wrote: What is the syntactical form of your user id values? --- A. Soroka The University of Virginia Library On Jul 6, 2016, at 10:14 PM, Al Shapiro wrote: Daniel, I want to create a Named Graph "X", based on User-Id, the data for each named Graph is created on the fly, when a Match occurs against the Default Graph (which has already been loaded to the Jena TDB)... I need to know how to generate the Named Graph based on IRI? Do I create a NameSpace for the IRI? Please give me an example... Thank you, Al On Wednesday, July 6, 2016 6:45 AM, Daniel Hernández wrote: I suggest that you first translate your data to RDF using an script (e.g., in Ruby, Python, etc.) to generate a text file in one of the RDF serialization formats that support named graphs (e.g., nquads). Then, you can load the data into jena using tdbloader. Daniel El 06/07/16 a las 01:10, Al Shapiro escribió: Daniel, Thank you, this gives me part of the answer... Can you give me an example(s) of the IRI's that you used to name your Named Graphs and how they are defined as an IRI, in Sparql?. Please withhold any proprietary info... Thank you again, Al On Tuesday, July 5, 2016 9:55 PM, Daniel Hernández wrote: Hi Al, Yes, you can use any IRI to name graphs. Thus, in particular you can use user ids to compose names of graphs. Daniel El 05/07/16 a las 23:58, Al Shapiro escribió: Hi Daniel, I am a Newbie at Jena Sparql and I would like to know how you addressed the value of each Named Graph you created, for example, I have successfully used GRAPH qm:g1 to create a Named Graph "g1", can I substitute a variable for "g1" such as "user _number", to create multiple Named Graphs based on the value of "user _number"? Thank you for help... Al On Monday, July 4, 2016 8:38 PM, Daniel Hernández wrote: Hi Chris, It is possible. In fact, I have loaded 57 million of named graphs and then queried without problem. You can see the details in http://users.dcc.uchile.cl/~dhernand/research/ssws-2015-reifying.pdf Daniel El 04/07/16 a las 19:21, Chris Jones escribió: Hi All, How many named graphs can Jena gracefully handle? Hundreds, thousands, millions? I've found references to Jena handling large triple stores, with billions of statements; but nothing about how many named graphs. I'm writing a system where I'm considering giving each remote client its own named graph where it uploads data. I'm further considering keeping historical data, so the client would get a new named graph each time it sent its data. I'm curious if this is a bad idea. Chris
Re: many named graphs
Hello Al, I do not understand why it is so difficult for you to generate some IRIs for a users that have an ID. Just use your own namespace and append the ID. And generating graphs depends on the triple store that you use. In Jena for instance, you could use some methods of the Dataset [1], like addNamedModel() [1] https://jena.apache.org/documentation/javadoc/arq/org/apache/jena/query/Dataset.html Kind regards, Lorenz > A. Soroka, > > The syntactical form of my user id values, is a variable containing > "U001" through "U999" - the user id is assigned when an end-user > first logs on to the system, with their e-mail and password - as long as the > account is valid, the end-user retains the same user id assigned to it when > they first logged on (registered)... > > I still need to know how to generate the Named Graph based on IRI, etc? > > Thank you, > Al > > On Thursday, July 7, 2016 6:25 AM, A. Soroka wrote: > > > What is the syntactical form of your user id values? > > --- > A. Soroka > The University of Virginia Library > >> On Jul 6, 2016, at 10:14 PM, Al Shapiro wrote: >> >> Daniel, >> I want to create a Named Graph "X", based on User-Id, the data for each >> named Graph is created on the fly, when a Match occurs against the Default >> Graph (which has already been loaded to the Jena TDB)... >> I need to know how to generate the Named Graph based on IRI? >> Do I create a NameSpace for the IRI? >> Please give me an example... >> Thank you, >> Al >> >> On Wednesday, July 6, 2016 6:45 AM, Daniel Hernández >> wrote: >> >> >> I suggest that you first translate your data to RDF using an script >> (e.g., in Ruby, Python, etc.) to generate a text file in one of the RDF >> serialization formats that support named graphs (e.g., nquads). Then, >> you can load the data into jena using tdbloader. >> >> Daniel >> >> El 06/07/16 a las 01:10, Al Shapiro escribió: >>> Daniel, >>> Thank you, this gives me part of the answer... >>> Can you give me an example(s) of the IRI's that you used to name your Named >>> Graphs and how they are defined as an IRI, in Sparql?. >>> Please withhold any proprietary info... >>> Thank you again, >>> Al >>> >>> >>> >>> >>> On Tuesday, July 5, 2016 9:55 PM, Daniel Hernández >>> wrote: >>> >>> >>> Hi Al, >>> >>> Yes, you can use any IRI to name graphs. Thus, in particular you can use >>> user ids to compose names of graphs. >>> >>> Daniel >>> >>> El 05/07/16 a las 23:58, Al Shapiro escribió: Hi Daniel, I am a Newbie at Jena Sparql and I would like to know how you addressed the value of each Named Graph you created, for example, I have successfully used GRAPH qm:g1 to create a Named Graph "g1", can I substitute a variable for "g1" such as "user _number", to create multiple Named Graphs based on the value of "user _number"? Thank you for help... Al On Monday, July 4, 2016 8:38 PM, Daniel Hernández wrote: Hi Chris, It is possible. In fact, I have loaded 57 million of named graphs and then queried without problem. You can see the details in http://users.dcc.uchile.cl/~dhernand/research/ssws-2015-reifying.pdf Daniel El 04/07/16 a las 19:21, Chris Jones escribió: > Hi All, > > How many named graphs can Jena gracefully handle? Hundreds, thousands, > millions? I've found references to Jena handling large triple stores, > with billions of statements; but nothing about how many named graphs. > > I'm writing a system where I'm considering giving each remote client > its own named graph where it uploads data. I'm further considering > keeping historical data, so the client would get a new named graph > each time it sent its data. I'm curious if this is a bad idea. > > Chris > >>> >>> >>> >> >> >> > > -- Lorenz Bühmann AKSW group, University of Leipzig Group: http://aksw.org - semantic web research center
Re: many named graphs
A. Soroka, The syntactical form of my user id values, is a variable containing "U001" through "U999" - the user id is assigned when an end-user first logs on to the system, with their e-mail and password - as long as the account is valid, the end-user retains the same user id assigned to it when they first logged on (registered)... I still need to know how to generate the Named Graph based on IRI, etc? Thank you, Al On Thursday, July 7, 2016 6:25 AM, A. Soroka wrote: What is the syntactical form of your user id values? --- A. Soroka The University of Virginia Library > On Jul 6, 2016, at 10:14 PM, Al Shapiro wrote: > > Daniel, > I want to create a Named Graph "X", based on User-Id, the data for each named > Graph is created on the fly, when a Match occurs against the Default Graph > (which has already been loaded to the Jena TDB)... > I need to know how to generate the Named Graph based on IRI? > Do I create a NameSpace for the IRI? > Please give me an example... > Thank you, > Al > > On Wednesday, July 6, 2016 6:45 AM, Daniel Hernández >wrote: > > > I suggest that you first translate your data to RDF using an script > (e.g., in Ruby, Python, etc.) to generate a text file in one of the RDF > serialization formats that support named graphs (e.g., nquads). Then, > you can load the data into jena using tdbloader. > > Daniel > > El 06/07/16 a las 01:10, Al Shapiro escribió: >> Daniel, >> Thank you, this gives me part of the answer... >> Can you give me an example(s) of the IRI's that you used to name your Named >> Graphs and how they are defined as an IRI, in Sparql?. >> Please withhold any proprietary info... >> Thank you again, >> Al >> >> >> >> >> On Tuesday, July 5, 2016 9:55 PM, Daniel Hernández >>wrote: >> >> >> Hi Al, >> >> Yes, you can use any IRI to name graphs. Thus, in particular you can use >> user ids to compose names of graphs. >> >> Daniel >> >> El 05/07/16 a las 23:58, Al Shapiro escribió: >>> Hi Daniel, >>> I am a Newbie at Jena Sparql and I would like to know how you addressed the >>> value of each Named Graph you created, for example, I have successfully >>> used GRAPH qm:g1 to create a Named Graph "g1", can I substitute a variable >>> for "g1" such as "user _number", to create multiple Named Graphs based on >>> the value of "user _number"? >>> Thank you for help... >>> Al >>> >>> >>> >>> >>> >>> >>> >>> >>> On Monday, July 4, 2016 8:38 PM, Daniel Hernández >>>wrote: >>> >>> >>> Hi Chris, >>> >>> It is possible. In fact, I have loaded 57 million of named graphs and >>> then queried without problem. You can see the details in >>> http://users.dcc.uchile.cl/~dhernand/research/ssws-2015-reifying.pdf >>> >>> Daniel >>> >>> El 04/07/16 a las 19:21, Chris Jones escribió: Hi All, How many named graphs can Jena gracefully handle? Hundreds, thousands, millions? I've found references to Jena handling large triple stores, with billions of statements; but nothing about how many named graphs. I'm writing a system where I'm considering giving each remote client its own named graph where it uploads data. I'm further considering keeping historical data, so the client would get a new named graph each time it sent its data. I'm curious if this is a bad idea. Chris >>> >>> >>> >> >> >> >> > > > >
Re: many named graphs
What is the syntactical form of your user id values? --- A. Soroka The University of Virginia Library > On Jul 6, 2016, at 10:14 PM, Al Shapiro wrote: > > Daniel, > I want to create a Named Graph "X", based on User-Id, the data for each named > Graph is created on the fly, when a Match occurs against the Default Graph > (which has already been loaded to the Jena TDB)... > I need to know how to generate the Named Graph based on IRI? > Do I create a NameSpace for the IRI? > Please give me an example... > Thank you, > Al > >On Wednesday, July 6, 2016 6:45 AM, Daniel Hernández > wrote: > > > I suggest that you first translate your data to RDF using an script > (e.g., in Ruby, Python, etc.) to generate a text file in one of the RDF > serialization formats that support named graphs (e.g., nquads). Then, > you can load the data into jena using tdbloader. > > Daniel > > El 06/07/16 a las 01:10, Al Shapiro escribió: >> Daniel, >> Thank you, this gives me part of the answer... >> Can you give me an example(s) of the IRI's that you used to name your Named >> Graphs and how they are defined as an IRI, in Sparql?. >> Please withhold any proprietary info... >> Thank you again, >> Al >> >> >> >> >> On Tuesday, July 5, 2016 9:55 PM, Daniel Hernández >> wrote: >> >> >> Hi Al, >> >> Yes, you can use any IRI to name graphs. Thus, in particular you can use >> user ids to compose names of graphs. >> >> Daniel >> >> El 05/07/16 a las 23:58, Al Shapiro escribió: >>> Hi Daniel, >>> I am a Newbie at Jena Sparql and I would like to know how you addressed the >>> value of each Named Graph you created, for example, I have successfully >>> used GRAPH qm:g1 to create a Named Graph "g1", can I substitute a variable >>> for "g1" such as "user _number", to create multiple Named Graphs based on >>> the value of "user _number"? >>> Thank you for help... >>> Al >>> >>> >>> >>> >>> >>> >>> >>> >>> On Monday, July 4, 2016 8:38 PM, Daniel Hernández >>> wrote: >>> >>> >>> Hi Chris, >>> >>> It is possible. In fact, I have loaded 57 million of named graphs and >>> then queried without problem. You can see the details in >>> http://users.dcc.uchile.cl/~dhernand/research/ssws-2015-reifying.pdf >>> >>> Daniel >>> >>> El 04/07/16 a las 19:21, Chris Jones escribió: Hi All, How many named graphs can Jena gracefully handle? Hundreds, thousands, millions? I've found references to Jena handling large triple stores, with billions of statements; but nothing about how many named graphs. I'm writing a system where I'm considering giving each remote client its own named graph where it uploads data. I'm further considering keeping historical data, so the client would get a new named graph each time it sent its data. I'm curious if this is a bad idea. Chris >>> >>> >>> >> >> >> >> > > > >
Re: many named graphs
Daniel, I want to create a Named Graph "X", based on User-Id, the data for each named Graph is created on the fly, when a Match occurs against the Default Graph (which has already been loaded to the Jena TDB)... I need to know how to generate the Named Graph based on IRI? Do I create a NameSpace for the IRI? Please give me an example... Thank you, Al On Wednesday, July 6, 2016 6:45 AM, Daniel Hernández wrote: I suggest that you first translate your data to RDF using an script (e.g., in Ruby, Python, etc.) to generate a text file in one of the RDF serialization formats that support named graphs (e.g., nquads). Then, you can load the data into jena using tdbloader. Daniel El 06/07/16 a las 01:10, Al Shapiro escribió: > Daniel, > Thank you, this gives me part of the answer... > Can you give me an example(s) of the IRI's that you used to name your Named > Graphs and how they are defined as an IRI, in Sparql?. > Please withhold any proprietary info... > Thank you again, > Al > > > > > On Tuesday, July 5, 2016 9:55 PM, Daniel Hernández >wrote: > > > Hi Al, > > Yes, you can use any IRI to name graphs. Thus, in particular you can use > user ids to compose names of graphs. > > Daniel > > El 05/07/16 a las 23:58, Al Shapiro escribió: >> Hi Daniel, >> I am a Newbie at Jena Sparql and I would like to know how you addressed the >> value of each Named Graph you created, for example, I have successfully used >> GRAPH qm:g1 to create a Named Graph "g1", can I substitute a variable for >> "g1" such as "user _number", to create multiple Named Graphs based on the >> value of "user _number"? >> Thank you for help... >> Al >> >> >> >> >> >> >> >> >> On Monday, July 4, 2016 8:38 PM, Daniel Hernández >>wrote: >> >> >> Hi Chris, >> >> It is possible. In fact, I have loaded 57 million of named graphs and >> then queried without problem. You can see the details in >> http://users.dcc.uchile.cl/~dhernand/research/ssws-2015-reifying.pdf >> >> Daniel >> >> El 04/07/16 a las 19:21, Chris Jones escribió: >>> Hi All, >>> >>> How many named graphs can Jena gracefully handle? Hundreds, thousands, >>> millions? I've found references to Jena handling large triple stores, >>> with billions of statements; but nothing about how many named graphs. >>> >>> I'm writing a system where I'm considering giving each remote client >>> its own named graph where it uploads data. I'm further considering >>> keeping historical data, so the client would get a new named graph >>> each time it sent its data. I'm curious if this is a bad idea. >>> >>> Chris >>> >> >> >> > > > >
Re: many named graphs
I suggest that you first translate your data to RDF using an script (e.g., in Ruby, Python, etc.) to generate a text file in one of the RDF serialization formats that support named graphs (e.g., nquads). Then, you can load the data into jena using tdbloader. Daniel El 06/07/16 a las 01:10, Al Shapiro escribió: Daniel, Thank you, this gives me part of the answer... Can you give me an example(s) of the IRI's that you used to name your Named Graphs and how they are defined as an IRI, in Sparql?. Please withhold any proprietary info... Thank you again, Al On Tuesday, July 5, 2016 9:55 PM, Daniel Hernández wrote: Hi Al, Yes, you can use any IRI to name graphs. Thus, in particular you can use user ids to compose names of graphs. Daniel El 05/07/16 a las 23:58, Al Shapiro escribió: Hi Daniel, I am a Newbie at Jena Sparql and I would like to know how you addressed the value of each Named Graph you created, for example, I have successfully used GRAPH qm:g1 to create a Named Graph "g1", can I substitute a variable for "g1" such as "user _number", to create multiple Named Graphs based on the value of "user _number"? Thank you for help... Al On Monday, July 4, 2016 8:38 PM, Daniel Hernández wrote: Hi Chris, It is possible. In fact, I have loaded 57 million of named graphs and then queried without problem. You can see the details in http://users.dcc.uchile.cl/~dhernand/research/ssws-2015-reifying.pdf Daniel El 04/07/16 a las 19:21, Chris Jones escribió: Hi All, How many named graphs can Jena gracefully handle? Hundreds, thousands, millions? I've found references to Jena handling large triple stores, with billions of statements; but nothing about how many named graphs. I'm writing a system where I'm considering giving each remote client its own named graph where it uploads data. I'm further considering keeping historical data, so the client would get a new named graph each time it sent its data. I'm curious if this is a bad idea. Chris
Re: many named graphs
Daniel, Thank you, this gives me part of the answer... Can you give me an example(s) of the IRI's that you used to name your Named Graphs and how they are defined as an IRI, in Sparql?. Please withhold any proprietary info... Thank you again, Al On Tuesday, July 5, 2016 9:55 PM, Daniel Hernández wrote: Hi Al, Yes, you can use any IRI to name graphs. Thus, in particular you can use user ids to compose names of graphs. Daniel El 05/07/16 a las 23:58, Al Shapiro escribió: > Hi Daniel, > I am a Newbie at Jena Sparql and I would like to know how you addressed the > value of each Named Graph you created, for example, I have successfully used > GRAPH qm:g1 to create a Named Graph "g1", can I substitute a variable for > "g1" such as "user _number", to create multiple Named Graphs based on the > value of "user _number"? > Thank you for help... > Al > > > > > > > > > On Monday, July 4, 2016 8:38 PM, Daniel Hernández wrote: > > > Hi Chris, > > It is possible. In fact, I have loaded 57 million of named graphs and > then queried without problem. You can see the details in > http://users.dcc.uchile.cl/~dhernand/research/ssws-2015-reifying.pdf > > Daniel > > El 04/07/16 a las 19:21, Chris Jones escribió: >> Hi All, >> >> How many named graphs can Jena gracefully handle? Hundreds, thousands, >> millions? I've found references to Jena handling large triple stores, >> with billions of statements; but nothing about how many named graphs. >> >> I'm writing a system where I'm considering giving each remote client >> its own named graph where it uploads data. I'm further considering >> keeping historical data, so the client would get a new named graph >> each time it sent its data. I'm curious if this is a bad idea. >> >> Chris >> > > > >
Re: many named graphs
Hi Al, Yes, you can use any IRI to name graphs. Thus, in particular you can use user ids to compose names of graphs. Daniel El 05/07/16 a las 23:58, Al Shapiro escribió: Hi Daniel, I am a Newbie at Jena Sparql and I would like to know how you addressed the value of each Named Graph you created, for example, I have successfully used GRAPH qm:g1 to create a Named Graph "g1", can I substitute a variable for "g1" such as "user _number", to create multiple Named Graphs based on the value of "user _number"? Thank you for help... Al On Monday, July 4, 2016 8:38 PM, Daniel Hernández wrote: Hi Chris, It is possible. In fact, I have loaded 57 million of named graphs and then queried without problem. You can see the details in http://users.dcc.uchile.cl/~dhernand/research/ssws-2015-reifying.pdf Daniel El 04/07/16 a las 19:21, Chris Jones escribió: Hi All, How many named graphs can Jena gracefully handle? Hundreds, thousands, millions? I've found references to Jena handling large triple stores, with billions of statements; but nothing about how many named graphs. I'm writing a system where I'm considering giving each remote client its own named graph where it uploads data. I'm further considering keeping historical data, so the client would get a new named graph each time it sent its data. I'm curious if this is a bad idea. Chris
Re: many named graphs
Hi Daniel, I am a Newbie at Jena Sparql and I would like to know how you addressed the value of each Named Graph you created, for example, I have successfully used GRAPH qm:g1 to create a Named Graph "g1", can I substitute a variable for "g1" such as "user _number", to create multiple Named Graphs based on the value of "user _number"? Thank you for help... Al On Monday, July 4, 2016 8:38 PM, Daniel Hernández wrote: Hi Chris, It is possible. In fact, I have loaded 57 million of named graphs and then queried without problem. You can see the details in http://users.dcc.uchile.cl/~dhernand/research/ssws-2015-reifying.pdf Daniel El 04/07/16 a las 19:21, Chris Jones escribió: > Hi All, > > How many named graphs can Jena gracefully handle? Hundreds, thousands, > millions? I've found references to Jena handling large triple stores, > with billions of statements; but nothing about how many named graphs. > > I'm writing a system where I'm considering giving each remote client > its own named graph where it uploads data. I'm further considering > keeping historical data, so the client would get a new named graph > each time it sent its data. I'm curious if this is a bad idea. > > Chris >
Re: many named graphs
Hi Chris, It is possible. In fact, I have loaded 57 million of named graphs and then queried without problem. You can see the details in http://users.dcc.uchile.cl/~dhernand/research/ssws-2015-reifying.pdf Daniel El 04/07/16 a las 19:21, Chris Jones escribió: Hi All, How many named graphs can Jena gracefully handle? Hundreds, thousands, millions? I've found references to Jena handling large triple stores, with billions of statements; but nothing about how many named graphs. I'm writing a system where I'm considering giving each remote client its own named graph where it uploads data. I'm further considering keeping historical data, so the client would get a new named graph each time it sent its data. I'm curious if this is a bad idea. Chris
