A database server really isn't the right solution to his problem. His Storable file is (as he said in a reply to your earlier post) the saved state from a module that almost certainly won't map well onto a relational database, and even if he could find some workable schema it would entail a re-write of the CPAN module he is using.
Of course, he could save it in a BLOB field in the database, but this leaves him much worse off than he was before: now he is not only loading the file into memory every time again, but he also has to transfer it out of the database which is going to have a significant amount of overhead.
Databases are a good solution to a wide variety of programming problems, but this unfortunately isn't one of them. (Unless I'm missing something -- if I am, would you mind explaining in more detail how your proposed solution would work?)
Edited to add: I might be mis-interpreting "database" as "relational database", but even using some non-relational DB like BerkeleyDB isn't going to leave him any better off than he is now, at least as far as I can see.
Edit again: Well, you could write it as a stored procedure in PL/Perl in Postgres and it would probably work, but that doesn't make it a good idea.
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