Why not? If you pick your model well incremental updates to the model can be made fairly cheap. An open source example that's relatively usable can be found at

Why not? If you pick your model well incremental updates to the model can be made fairly cheap. An open source example that's relatively usable can be found at http://probcomp.csail.mit.edu/software/bayesdb/ http://probcomp.csail.mit.edu/software/bayesdb/