The problem with doing a simple transfer is that very few of the transfer tools are good at divining Oracle's constraints, etc. You really need a tool that can do forward and reverse database engineering to do a good job.
ERWin (from Computer Associates) is the grand-daddy of these tools. Visio Architect (Microsoft) is also very good and much less expensive. PowerDesigner from Sybase is also a good tool, and there are many other tools from other third parties, and many freeware packages that will help with these transfers.
Another option would be to script out the Oracle PL/SQL script to rebuild the database (using Oracle's TOAD), then manually editing that script so it will run in the SQL-2000 environment. This is a bit more work than the tools that will do the conversion "automagically" for you, but it will also produce much better results since you'll understand exactly what was changed, how, and why.
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This was first published in November 2002