Requirements¶
What’s in this document?
Minimum requirements¶
The minimum requirements allow loading datasets only up to 50 million RDF triples.
- 2 GB Memory
- 2 GB Disk space
- Java SE Development Kit 8 (optional for GraphDB Free desktop installation)
Warning
All GraphDB indexes are optimized for hard disk with very low seek time. Our team highly recommend using only SSD partition for persisting repository images!
Hardware sizing¶
The best approach to correctly size the hardware resources is to estimate the number of explicit statements. Statistically, an average dataset has 3:1 statements to unique RDF resources. The total number of statements determines the expected repository image size and the number of unique resources affects the memory footprint required to initialise the repository.
The table below summarises the recommended parameters for planning RAM and disk sizing:
- Statements are the planned number of explicit statements.
- Unique resources are the expected number of unique RDF resources (IRIs, blank nodes, literals).
- Java heap (minimal) is the minimal recommend JVM heap required to operate the database controlled by
-Xmxparameter.- Java heap (optimal) is the recommended JVM heap required to operate a database controlled by
-Xmxparameter.- Off heap is the database memory footprint (outside of the JVM heap) required to initialise the database.
- OS is the recommended minimal space reserved for the operating system.
- Total is the RAM required to provide for the hardware configuration.
- Repository image is the expected size on disk. For repositories with inference use the total number of explicit + implicit statements.
| Statements | Unique resources | Java heap (min) | Java heap (opt) | Off heap | OS | Total | Repository image |
|---|---|---|---|---|---|---|---|
| 100M | 33.3M | 1.2GB | 3.6GB | 370M | 2 | 6GB | 12GB |
| 200M | 66.6M | 2.4GB | 7.2GB | 740M | 3 | 11GB | 24GB |
| 500M | 166.5M | 6GB | 18GB | 1.86GB | 4 | 24GB | 60GB |
| 1B | 333M | 12GB | 30GB | 3.72GB | 4 | 38GB | 120GB |
| 2B | 666M | 24GB | 30GB | 7.44GB | 4 | 42GB | 240GB |
| 5B | 1.665B | 30GB | 30GB | 18.61GB | 4 | 53GB | 600GB |
| 10B | 3.330B | 30GB | 30GB | 37.22GB | 4 | 72GB | 1200GB |
| 20B | 6.660B | 30GB | 30GB | 74.43GB | 4 | 109GB | 2400GB |
Licensing¶
GraphDB Free is available under an RDBMS-like free license. It is free to use but not open-source. Before redistributing GraphDB Free, please contact us at graphdb-info@ontotext.com to receive a permission.