> If a DBMS is smart enough, it can automatically pick the best storage 
> method for performance and you don't have to think about it.
> 
> However, many DBMS are not that smart and so typically users find 
> themselves making explicit changes to their schemas, specifying the 
> storage method explicitly, in order to compensate and/or give the 
> DBMS hints.  

   This implies that there are databases that provide multiple storage
mechanisms and allow users to choose between the options.  Does such a
database exist?

   Or am I being too literal?

   -T

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