Oracle - One of the world's top two commercial databases. CS used to teach database courses using Oracle, but no longer does. UW still uses Oracle.
IBM DB2 - The other world's top commercial database. A free-download Community Edition is available. DB2 is currently used to teach CS 338 and CS 348 database courses.
MySQL - "The world's most popular open source database". We currently use it to provide a general-purpose database service in the student.cs and core.cs regions and to support internal services, like RT. It is commonly used by students in the CS Software Engineering courses.
PostgreSQL - "The world's most advanced open source database". We currently use it to teach the CS 448 database course.
Information in this area is meant for use by CSCF staff and is not official documentation, but anybody who is interested is welcome to use it if they find it useful.