> I am using MySQL currently, but am starting to think that
> maybe I don't
> really need to use an RDBMS
You can use flat file storage, but that would be inefficient.
I guess you could try to create a custom system and keep
all the records in RAM. That would require some decent
coding to make it efficient. How big is your full dataset?
If it is small, the NDB engine stores indexed columns in
RAM. That might work for you.
MyISAM tables is probabably going to be the easiest to
implement and it will still be quite fast. Unless you
really need something fancy, I think you should go with
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