Virtuoso Open Source Edition News (2008)

Later Years


2008-11-05: Announcing Virtuoso Open-Source Edition v5.0.9

This version includes significant performance optimizations to the SQL Engine, SPARQL+RDF Engine, ODBC and JDBC drivers.

New features include

There are also minor bug-fixes

For more details, see the release notes.

2008-08-27: Announcing Virtuoso Open-Source Edition v5.0.8

This version focuses on performance optimizations and speed enhancements:

On the ODS front, the following have been addressed:

For more details, see the release notes.

2008-07-17: Announcing Virtuoso Open-Source Edition v5.0.7


Licensing change


Documentation Additions

Bug Fixes

For more details, see the release notes.

2008-03-28: Announcing Virtuoso Open-Source Edition v5.0.6

On the RDF side, the bitmap intersection join has been optimized so that it is now typically twice as efficient as an equivalent nested loop join.

In some cases XML trees in the object position in RDF quads were incorrectly indexed, leading to failure to retrieve quads. This is fixed and should problems occur in existing databases, they can be corrected by simply dropping and re-creating an index.

The cost model has been further tuned. We have run the TPC-H queries with larger databases and have profiled it extensively. There are improvements to locking, especially for concurrency of transactions with large shared lock sets, as is the case in the TPC-H queries. The rules stipulate that these have to be run with repeatable read. There are also optimizations for decimal floating point.

As part of the completion of our Business Intelligence extensions to SPARQL (SPARQL-BI), we released a sampling of TPC-H queries translated into SPARQL, and integrated this into the standard demonstration database. The new demo database provides a live sample of the TPC-H schema and instance data in linked-data form, complete with SPARQL-BI variants of the standard TPC-H queries. Relational-to-RDF model-mapping is now demonstrably mature and robust enough for enterprise-grade business-intelligence applications.

For more details, see the release notes.

2008-02-12: Announcing Virtuoso Open-Source Edition v5.0.5

The previous release, 5.0.4, was short-lived due to a problem in SPARQL-to-SQL code-generation, so this announcement addresses the new features introduced over and above version 5.0.3:

In the core Database Engine: Added the LUBM benchmark for RDF data managers to testsuite; a check for backup/restore status; optimizations and an inxop option for bitmap indexes.

In the areas of RDF and SPARQL: Support for xsl:float; Sponger cartridges for SVG, XBRL and HR-XML documents; URL-rewrite rules for XBRL; additional SPARQL engine optimizations.

In the ODS Applications Suite: New support for Meaning of a Tag (MOAT); Support for Identity and authentications standards such as OpenID 2.0 and OAuth; additional ODS generated dereferenceable URIs; enhanced Wiki search; improvements to Calendar.

Additionally, there are the following bug-fixes: In the core database: Problems with FTP server and HTTP headers; saved unnecessary seeks in bitmap checks; fixed the 64-bit range of IRI and row IDs; various minor bug-fixes and compiler-warnings.

In the ODS Applications Suite: Fixed ATOM protocol upstreaming, Creole markup, docbook and invalid HTML generation in ODS-Wiki; improvements to SIOC based RDF instance data in relation to ODS-Calendar todo-lists; a new UI for system navigation.

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