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Jun 28, 2021
FROM vs FROM NAMED, what’s the difference, and when should I use one or the other is a constant source of confusion for SPARQL users. It’s one of the main reasons why a query can surprisingly return zero results and the most experienced of us have been tricked by it at least once. This short post goes into a little bit of a detail of the difference and discusses how both can be used to address different use cases.
John Bresnahan
Mar 18, 2021
As discussed in a previous post Stardog Cloud relies on VolumeSnapshots in Kubernetes (k8s) for backups of user data. In this post we will go into more technical details of how to work with VolumeSnapshots in the Elastic Kubernetes Service (EKS). Kubernetes Components Here we will presents the k8s components that are used when working with VolumeSnapshots. We do not go into exhaustive details here but rather briefly give an overview to ease in understanding the concepts in this post.
Evren Sirin
Mar 3, 2021
At Stardog we are continuously pushing the boundaries of performance and scalability. Last month’s 7.5.0 release brought 500% improvement to transactional write performance. This month’s 7.6.0 release improves writing data at database creation time by almost 100%, yielding a million triples per second loading speed using a commodity server. In this post we’ll talk about the details of loading performance. Let’s do the numbers The fastest way to load large amounts of data into Stardog is to do at database creation time.
Evren Sirin
Feb 16, 2021
Stardog 7.5.0 improves write performance up to 500% in some cases. In this post I describe the details of this improvement and share detailed benchmarking results for update performance. Large Updates A common usage pattern for Stardog involves connecting to external data sources through virtual graphs that are queried on-demand without storing any data in Stardog. However, in some cases you might enable virtual graph caching to pull data into Stardog for indexing and in some other cases it is preferable or even necessary to materialize the data in Stardog completely.
John Bresnahan
Feb 5, 2021
Stardog can be configured to use third party OAuth 2.0 identity providers for authentication. In this post we will explain how this is done and how to configure your Stardog server to do it. Architecture Proving Identity — Authentication When interacting with an Open Identify Connect service or an OAuth 2.0 indentity provider like Google the concept of a JSON Web Token (JWT) is at the center of the system.
Evren Sirin
Jan 27, 2021
Benchmarking is an essential part of developing any performance-sensitive software and Stardog is no exception. For a system as complex as Stardog, any single change in any part of the codebase might have unforeseen implications. Given that our customers have very different use cases, their data and query characteristics vary significantly making it harder for us to make sure their workloads will not slow down when we add a new feature or fix a bug.
John Bresnahan
Jan 15, 2021
When running a datastore like Stardog it is important to take regular backups. However it is also important to consider the side effects that taking a backup can cause. Administrators have to balance the frequency of backups against the disruption to resources that can be caused creating that backup. If the backup process is CPU, memory, or IO intensive, care must be taken to make sure that it does not interrupt a period of heavy user activity.
Stanislav Klenin
Nov 12, 2020
When it comes to languages for querying databases, they tend to look more human-readable than a typical programming language. SPARQL, as well as SQL, employs declarative approach, allowing to describe what data needs to be retrieved without burdening the user with minutiae of how to do it. Besides being easier on the eyes, this leaves a DBMS free to choose the way it executes queries. And as is typical for database management systems, Stardog has its own internal representation for SPARQL queries: the query plan.
Paul Jackson
Sep 10, 2020
We are happy to announce a new feature that enhances your ability to load data into Stardog’s graph database with the release of Nifi support in v7.4.
Pavel Klinov
Aug 14, 2020
Stardog is a very extensible platform and the SERVICE keyword in SPARQL is one of its main extension points. It was originally introduced for SPARQL Federation, i.e. querying remote SPARQL endpoints on the Web, but at Stardog we recognised a long time ago that SERVICE could be used far beyond that. For us and our customers, it is a general mechanism for incorporating all sorts of computation within SPARQL queries, for example, we have been using it for full-text search and Machine Learning.
Evren Sirin
Aug 12, 2020
At Stardog I’m very lucky to work every day with the best engineers anyone could hope for. Startups are hard but having the right teammates makes all the difference when you are building an innovative product in a competitive market. Putting together a team that will tip the scale to your side is not easy. We have made some mistakes along the way with respect to recruiting. But as in any other aspect of running and growing a business, you need to learn from your mistakes and get better at it.
Evren Sirin
Jul 13, 2020
For those of us living in the US, increasing COVID-19 case numbers across the country is unfortunately at the top of our minds. We do not lack access to data or infographics about the pandemic but having access to raw data and writing queries yourself can still give you different insights or at least get you better at writing queries. For this reason, we decided to turn the open-source COVID-19 dataset published by New York Times into RDF and included it in our publicly accessible Stardog Sandbox environment.
Kendall Clark
Jul 6, 2020
I’m delighted to welcome you to Stardog Labs, a new hub of insight, news, and buzz about knowledge graph technology. The site will advance knowledge graph R&D by featuring technical blogs, showcasing job opportunities focused on knowledge graph development, and curating research papers and open source projects.
Evren Sirin
May 5, 2020
The Cloud Information Model (CIM) addresses the brittle data integrations that are common amongst enterprises. With the Stardog CIM archetype, you can start building your knowledge graph with a rich data model that is being standardized by industry leaders.
Guest author Bram Steenwinckel
Mar 18, 2020
Guest author Bram Steenwinckel describes how to perform semantic reasoning over streaming data in your knowledge graph.
13th Annual International Technology, Education and Development Conference | Mar 28, 2019
The fast development of software for medicine caused the arise of new methods of learning about illnesses and complications which appear during pregnancies.
Carlos III University of Madrid | Oct 26, 2019
Business models, organizational activities and corporate strategies are now being reshaped to meet the new needs of a challenging and evolving environment in which more up-todate, secure, safer, cost-efficient and personalized software products and services must be timely delivered.
Lecture Notes in Computer Science | Nov 4, 2019
Path querying on Semantic Networks is gaining increased focus because of its broad applicability. Some graph databases offer support for variants of path queries e.g. shortest path.