what is Ingres?

Ingres (pronounced "ingress") is a commercially supported, open-source relational database management system that offers reliable and low cost application solutions. Since the mid-1980s, Ingres had spawned a number of commercial database applications, including Sybase, Microsoft SQL Server, NonStop SQL and a number of others.
Postgres (Post Ingres), a project which started in the mid-1980s, later evolved into PostgreSQL.
By any measure, Ingres is one of the most influential modern computer research projects.

advantages of Ingres

• Open source

• Customizable on different platforms

• Improved performance and web integration

• Ingres
• Open Source Solutions
• Comparison of relational database management systems