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May 16, 2024 · Wikidata provides an SPARQL endpoint including a powerful Web-GUI since September 2015. With SPARQL you can extract any kind of data, with a query composed of logical combinations of triples. SPARQL query service GUI is here: https://query.wikidata.org.
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SPARQL ("Sparkl" ausgesprochen) ist eine RDF-Abfragesprache,...
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SPARQL (pronunciato come sparkle in inglese, parola che...
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SPARQL (wym. „sparkel”) jest językiem zapytań RDF, czyli...
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Mar 8, 2024 · WDQS, the Wikidata Query Service, is a powerful tool to provide insight into Wikidata's content. This guide will teach you how to use it. See also the interactive tutorial by Wikimedia Israel.
Mar 24, 2024 · The Wikidata Query Service provides a SPARQL endpoint including a powerful Web-GUI. SPARQL (pronounced "sparkle") is an RDF query language, that is, a semantic query language for databases. With SPARQL, you can extract any kind of data, with a query composed of logical combinations of triples.
Jan 29, 2020 · Wikidata Query Service. There are a bunch of examples that we can pick from, but we’re going to start with something even simpler than that. Wikidata stores data in triples of the form (subject, predicate, object), so we’ll start with a query that returns one such triple: SELECT * WHERE { ?subject ?predicate ?object. } LIMIT 1.
- Code
- Build Blazegraph
- Create and Commit Puppet Code
- Manual Steps
- Sources
- Labs Deployment
- Production Deployment
- Warning
- Reloading
- Manual Process
The source code is in Gerrit project wikidata/query/rdf.In order to start working on Wikidata Query Service codebase, clone this repository: or GitHub mirror: or if you want to push changes and have a Gerrit account: Then you can build the distribution package by running: and the package will be in the dist/targetdirectory. Or, to run Blazegraph se...
If there are changes needed to Blazegraph source, they should be checked into wikidata/query/blazegraphrepo. After that, the new Blazegraph sub-version should be built and WDQS should switch to using it. The procedure to follow: 1. Commit fixes (watch for extra whitespace changes!) 2. Update README.wmfwith descriptions of which changes were done ag...
When a server is racked by DC Ops, they will add it to the Puppet repo's site.pp. See the Server Lifecycle pagefor more details on DC Ops' process.
Once Puppet runs, there are a few manual steps required. These are temporary and subject to change. See this Phab ticketfor more context . 1. Remove /srv/deployment/wdqs/* and do a forced scap deploy More details on why at T342162. 1. Run data-transfer cookbook Needed to get the actual Blazegraph data onto the server. As of this writing, the cookbo...
The source code is in the Gerrit project wikidata/query/rdf (GitHub mirror).The GUI source code is Gerrit project wikidata/query/gui (GitHub mirror), which is also a submodule of the main project. The deployment version of the query service is in the Gerrit project wikidata/query/deploy,with the deployment version of the GUI, wikidata/query/gui-dep...
Note that currently deployment is via git-fat (see below) which may require some manual steps after checkout. This can be done as follows: 1. Check out wikidata/query/deploy repository and update gui submodule to current production branch (git submodule update). 2. Run git-fat pullto instantiate the binaries if necessary. 3. rsync the files to depl...
Production deployment is done via git deployment repository wikidata/query/deploy. The procedure is as follows:
Reloading data is a time-consuming (~17 days) and fragile process. When possible, transfer data instead of reloading. As of this writing, it is not possible to complete a reload from codfw due to NFS issues, so be sure to use eqiad datacenter only. You can then use the data transfer process to send the data from eqiad to codfw.
Ensure clouddumps1001.wikimedia.org is mounted via NFS on the target host
Eventually we will move to rsync, but for now, you'll have to update puppet to mount the clouddumps hosts via NFS on your target server. Example PRs for mounting and opening the software firewall. You can combine your changes as a single PR, we just screwed it up on those two ;) .
Run the data-reload cookbook
Use the data-reload cookbookfrom cumin. Note that the process takes around 17 days to complete. Bugs in Blazegraph can cause the reload to corrupt itself. If that happens, you have to start the process over again.
The manual process is not used anymore, but is documented in this page's historyjust in case. Transferring data from between nodes is typically faster than recovering from a dump. The port 9876 is opened between the wdqs nodes of the same cluster for that purpose. Across different clusters, that port needs to be opened manually (and closed after th...
3 days ago · A 15-min Wikidata Query Service tutorial. Wikidata Query Service (WDQS) is a software package and public service designed to provide a SPARQL endpoint which allows you to query against the Wikidata data set. This page or other relevant documentation pages will be updated accordingly; it is recommended that you watch them if you are using the ...
Jan 11, 2024 · About Wikidata Query Service. Wikidata Query Service is the Wikimedia implementation of SPARQL server, based on Blazegraph engine, to service queries for Wikidata and other data sets.
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