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I am interested in the underlying data structure of the database and the way stackoverflow manages tags. I am about to build application that will rely entirely on tag based filters and I seek for the right approach. What is the best way to design the database, so a minimum queries will have to run in future when working with the sets of tags to filter my data. I did use the search, but couldn’t find what I am looking for.
Stackoverflow does not rely entirely on SQL database to work with tags. They cache, pre-sort and pre-aggregate them aggressively.
Read this interesting story of one optimization.
From there you can get some insights on how stackoverflow works.