How to choose your database

[misson]

You could, [...] Do you have a use-case in mind?

   

 

[callumacrae]

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Are you alright?

 

[misson]

There's nothing special you have to do. However, unless you have a good reason to use both (and I've yet to hear one), it's best to stick to a single RDBMS so you can query any tables from all the databases simultaneously if need be, and to simplify administration.