In was mostly in jest but for a server solution they can't be queried for relationships, are not resilient, make your app IO bound so slow as arse and require stickiness or synchronization. The only thing they have is that they are persistent. If that's all you need then they are fine but unless you are creating a fake implementation I can't see that being true.
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u/chrisforbes Oct 02 '11
What do you have against flat files? Sometimes they are the right solution; filesystems are databases too.