If you need something larger the good news is that there are only three major players left in the DBMS market:...
Oracle, IBM and Microsoft.
If you talk to an advocate of any of these systems you will rapidly learn that that, rather luckily, the advocate uses the one-true-database-engine and the other two are so badly flawed that no one in their right minds would use them. A fractionally more balanced view is that all three of them are extremely robust, highly scalable and perfectly competent.
I would counsel you to look at the applications you want to run, find out which engines they sit on and make your choice on that basis.
Dig Deeper on IBM DB2 management
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