Why do we need Fuseki Server?

Question

I am developing an application, which is using triple store (Jena TDB). It is clealy mentioned that TDB Supports SPARQL update and Query. Also, I understood that Fuseki is SPARQL server, that supports Update and Query as well. I do not find answer do the following questions:

1. If TDB supports SPARQL query and update, then why we need Fuseki?
2. Can I store my data in TDB and then access it in my application without using Fuseki?

Any response from your side will be valuable.

Neelon

1) Fuseki is an application to make your TDB endpoint accessible via web. 2) You can use TDB as a local store without Fuseki. Fuseki just makes it accessible for remote queries. – Sherborn

Answer 1

To expand on the comments you already received

TDB is an in-memory database backed by persistent disk storage which runs within a JVM and is accessible only within that JVM. TDB stores can only be accessed by a single JVM at a time (and TDB will enforce this restriction) so you cannot use TDB on its own if you need to share data between multiple JVMs

Fuseki is a web server that implements the SPARQL Protocol which is a standard way to expose a RDF database for querying/updating via HTTP. TDB is the database used by default underneath Fuseki though Fuseki can be configured on top of other RDF databases if desired.

Since Fuseki runs in a single JVM it can be used to share access to a TDB database with multiple applications because those applications access Fuseki via HTTP and Fuseki handles all access to the TDB database within its JVM. Additionally since the SPARQL Protocol is a standard you can use Fuseki to allow non-JVM applications to access your TDB database since they simply interact with Fuseki via the protocol and don't need to know how to interact with TDB directly.

To summarise:

• If you only ever need to have one application access a TDB database then you can use TDB directly
• If you need to have multiple applications (or non-JVM) applications access a TDB database then use Fuseki over TDB

Absenteeism