I was interested in doing some more work with Oracle Spatial and how it compares in speed to some of the other databases out there that work with Spatial data, such as PostGIS and MySQL.
This was even before my time. I started working with Version 6!
Looks like the CHS was ahead of their time.
During the period between Version 4 and the introduction of "SDO" (Spatial Data Option) in Version 7, the CHS and Oracle rewrote the kernel. As anyone who uses Oracle Spatial knows, the tables are prefixed with SDO_.
Just an interesting tid-bit about Oracle. It is amazing the information you can find out there on the web - with Wikipedia, one wonders "Where will Encyclopedia Britannica find a home in the digital world?"