What is a good relational database design for stock market data?

The answer depends entirely on what you're doing and on where your app plugs into the data streams.

The short answer is, 'not really' For stock market and other time series data a key value store like Berkley DB or Mongo is pretty good. Also, a data format like NetCDF (http://en.wikipedia.org/wiki/NetCDF) will likely serve you better in the long run. It also depends on what kind of access you want and how much time you want to store.

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