In this article, author Yang Li discusses the importance of precomputation techniques in databases, OLAP and data cubes, and some of the trends in using precomputation in big data analytics. If you are still wondering about it then this article is for you.
Precomputation is a common technique used in information retrieval and analysis. The basic idea is to calculate and store the intermediate results ahead of time, and reuse them to speed up further inquiries.
The oldest form of precomputation, perhaps, is the multiplication table used by the Babylonians about 4000 years ago. Nowadays, children memorize multiplication tables like the one below in grade school. So we can do multiplication of small numbers in our head by simply memorizing the precomputed result instead of calculating them by ourselves.
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