This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
It is somehow possible to install a Oracle DB on a OS X client - but you need to do all the install manually, and hope you have done it correct.
The server tool that where included in Tiger clients, are from Leopard excluded - so it is this server tool you need to replace with you own tool - or you really understand HOW the installation is working, then maybe you can do it on a Leopard/Snow Leopard without any new tools added.