| --- |
| title: TDB2 |
| slug: index |
| --- |
| |
| TDB2 is a component of [Apache Jena](https://jena.apache.org) for RDF storage |
| and query. It supports the full range of Jena APIs. TDB2 can be used as a high |
| performance RDF store on a single machine. TDB2 can be used with Apache Jena |
| Fuseki. |
| |
| TDB1 is the previous generation native storage system for Jena. |
| |
| Compared to TDB1: |
| |
| - No size limits on transactions : bulk uploads into a live Fuseki can be 100's |
| of millions of triples. |
| - Models and Graphs can be passed across transactions |
| - Transactional only (there is currently no "autocommit" mode). |
| - Better transaction control |
| - No queue of delayed updates |
| - No backlog problems. |
| - "Writer pays" - readers don't |
| - Datatypes of numerics preserved; `xsd:doubles` supported. |
| |
| **TDB2 is not compatible with TDB1** |
| |
| ## Documentation |
| |
| - [Migrating from TDB1](tdb2_migration.html) |
| - [Use with Fuseki2](tdb2_fuseki.html) |
| - [Command line tools](tdb2_cmds.html) |
| - [Database administration](tdb2_admin.html) |
