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Fank,
Previous post says it best - nothing beats real world experience. You can learn a lot from a linux/oracle combination. We haveclients that are using that technology in business critical environments. But you will learn best if you're in a production environment with developer interaction. That should cover all the bases.
You probably already know enough generic SQL to get a great start on learning those things that make Oracle Oracle ... like SQl*Plus and PL/SQL. That will be a good place to start.
You'll need to know about Net8 in the real world, so you made need 2 linux/oracle boxes.
Performance tuing, both of the database and the code is critical to keep a production system running smoothly. One little query can
dog a system, and a poorly tuned system costs a company real dollars. Finally, there's all the dba work required: adding datafiles, adding users, assigning roles, working with sysadmins, etc, etc, etc. I've just covered the topics in Oracle's Certification program for DBAs. A path you might want to consider. Toward that end, you may want to visit our web site, where thereare over 1,000 sample questions: