I was asking myself exactly the same question: 'why not one of the bigs like mysql or postgres or firebird or...?'

Alternatively you could consider a NoSQL database (i.e Mongo) or even plain perl for this. As you said that speed is secondary, and those use text files for storage, a 'terabyte level' size file (much more that what you need probably) is guaranteed in most systems

mongo tutorial (CPAN)

In reply to Re^2: Need DBM file that holds data up to 50,000 bytes by pvaldes
in thread Need DBM file that holds data up to 50,000 bytes by bulrush

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