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What is the difference between Virtuoso Column Store and Row Store Supported Formats?

As of version 7, Virtuoso offers a column-wise compressed storage format alongside its traditional row-wise storage format. In the column-wise storage model, each column of a table or index is stored contiguously, so that values of a single column on consecutive rows are physically adjacent. In this way, adjacent values are of the same type, and if the index is sorted on said value, the consecutive values often form an ascending sequence.

See more detailed information here.

What is the difference between Single-Tier and Multi-Tier Driver Formats?

Single-Tier drivers conform to the common perception of how ODBC or JDBC drivers are configured. They are installed on the client, customized to a particular database, and use the database vendor's communication services to connect to the database.

Multi-Tier drivers feature a Generic Driver installed on the client, a Request Broker and Database Agent installed on the server, and their own database independent networking layer. The Multi-Tier drivers are more sophisticated than the Single-Tier drivers as they have been developed with enterprise-wide deployment in mind and feature enhancements in areas such as performance, security and configuration management.

See our more detailed comparison here.

What is the Pilot Program and how would I obtain a full, non-expiring license?

We provide evaluators with the ability to download, install and test all products. The Data Access Driver and Universal Server product downloads are accompanied by a fully-functional license which will expire 15 days after download. After a successful test of a given product, users can purchase the appropriate license and receive a non-expiring license via email. We provide purchasing via our website, by direct contact with an Account Manager, or by contacting

Where are the OpenLink offices located?

US Office (Covering North, South & Central America, Canada, Caribbean and Japan):

10 Burlington Mall Road,
Suite 265,
Burlington, MA 01803, USA
Tel: 781-273-0900
Fax: 781-229-8030

UK Office (Covering Europe, Africa, Australia, Asia & Middle East):

Suite 273, Airport House,
Purley Way,
United Kingdom
Tel: +44 (0)20 8681 7701
Fax: +44 (0)20 8681 7702

How do I purchase your product?

You can place an order through one of the following methods:

  • Submit an Online Quote Request
  • Complete and submit your order via our Secure Online Shop
  • Call us on (781) 273-0900. Business hours are 9:00am to 5:30pm EST
  • Fax your order to (781) 229-8030
  • Mail your order to OpenLink Software, Inc - 10 Burlington Mall Road, Suite 265, Burlington, MA 01803
  • Send your email to

Please refer to the above Pricing Information section for detailed product-specific pricing information.

What are your accepted methods of payment?

We accept the following forms of payment:

  • Check Made payable to OpenLink Software, Inc.
  • Credit Card Type: American Express/MasterCard/Visa/ Diners Club
  • Bank Transfer Please contact OpenLink for Bank Details

What are your payment terms?

Payment must be received within 30 days of the invoice date. The register key will expire if payment is not received within this time period. Orders of $500 or less require payment by check or credit card with order and payment terms are not accepted.

Orders & Quotes

License Agreements


UDA Single-Tier

UDA Multi-Tier