DB2

[Gerald Combs]

Jonathan Hutchins wrote:
> I'm a little confused on the exact lineage of DB2, but isn't it Open Source?
> 
> The confusion stems in part from the fact that a lot of typical Linux 
> components, sendmail for instance, use "DB2" format databases for internal 
> functions.

You might be thinking of Berkeley DB.  It's a lightweight, flat-file, 
non-relational database: http://www.sleepycat.com/.