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.
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