Dave is an OLAP data virtualization software that lets you access and analyze read-only data in various systems in a federated manner allowing uniform access and query language across databases and file systems.

Dave works as a virtual database engine that allows users to define virtual schemas and virtual tables from multiple physical database sources and query those virtual tables within a virtual schema or multiple virtual schemas, helping developers, database administrators, and data analysts to work with multiple types of databases without having to switch between applications.

Currently, Dave already supports a variety of database systems, including MySQL, PostgreSQL, Oracle, Microsoft SQL Server, and CSV. More databases will be included in its development.