BlazeGraph vs QLever
Both are rdf databases queried with SPARQL. BlazeGraph (2007, GPL-2.0, Java) ranks #78 this month; QLever (2017-11, Apache-2.0, C++) ranks #6.
| Attribute | BlazeGraph | QLever |
|---|---|---|
| At a glance | ||
| Rank | #78 | #6 |
| Score | 41.4 | 69.6 |
| GitHub stars | 987 | 932 |
| Popularity | 53.6 | 56.9 |
| Activity | 30.5 | 75.6 |
| Community | 34.7 | 68.0 |
| Research | 50.0 | 85.3 |
| Fundamentals | ||
| Description | An RDF database supporting billions of edges on a single machine. Uses an alternative approach to RDF reification that enables property graph-like capabilities. Notable as the backend for Wikidata's query service. | A SPARQL engine capable of querying very large knowledge graphs (including complete Wikidata) on a single machine. Implements full SPARQL 1.1 with autocompletion and text search. |
| Vendor | SYSTAP | University of Freiburg |
| Model | RDF | RDF |
| Kind | database | database |
| Category | Established | Emerging |
| First released | 2007 | 2017-11 |
| Status | inactive — Last release in 2019. Project largely dormant, though still used by Wikidata. | active |
| License | GPL-2.0 | Apache-2.0 |
| Written in | Java | C++ |
| Query languages | SPARQL, Gremlin | SPARQL |
| gdotv support | yes | yes |
Feature scores — not surveyed for QLever
| Feature | BlazeGraph | QLever |
|---|---|---|
| Community & Business | ||
| Active development | · | — |
| Commercial support | · | — |
| Live community | 0.25 | — |
| Open Source | ✓ | — |
| Pricing | · | — |
| Trendiness | ✓ | — |
| Deployment | ||
| Containerization | · | — |
| Work as dedicated instance | ✓ | — |
| Work as embedded | ✓ | — |
| Testing in-memory version | · | — |
| Platform | ||
| Operating on Linux | 0.75 | — |
| Operating on Windows | 0.75 | — |
| SaaS offering | · | — |
| Operations | ||
| Automatic updates | · | — |
| Client side caching | · | — |
| Data versioning support | · | — |
| Live backups | · | — |
| Distribution | ||
| Cluster Re-balancing | · | — |
| Data Distribution | ✓ | — |
| High-Availability | ✓ | — |
| Query Distribution | ✓ | — |
| Replication support | ✓ | — |
| Developer Experience | ||
| Data types defined | 0.5 | — |
| Logging/Auditing | ✓ | — |
| Object-Graph Mapper | · | — |
| Reactive programming | · | — |
| Documentation up-to-date | ✓ | — |
| Binary protocol | ✓ | — |
| CLI | ✓ | — |
| GUI | ✓ | — |
| Data Model | ||
| Multi-database | · | — |
| Graph-native data | ✓ | — |
| REST API | ✓ | — |
| Query Language | ✓ | — |
| Transactions | ||
| Granular locking | · | — |
| Multiple isolation levels | ✓ | — |
| Read committed transaction | ✓ | — |
| Transaction support | ✓ | — |
| Schema & Security | ||
| Constraints | · | — |
| Schema support | · | — |
| Secondary indexes | ✓ | — |
| Server side procedures | ✓ | — |
| Triggers | · | — |
| Authentication | · | — |
| Authorization | · | — |
| Data encryption | · | — |
Links
- BlazeGraph · website · github · full profile
- QLever · website · github · full profile