I think the Gamma Database Machine Project [1] demonstrated the technique in 1990, though it predates the word “shard.” [1] https://pages.cs.wisc.edu/~dewitt/i

I think the Gamma Database Machine Project [1] demonstrated the technique in 1990, though it predates the word “shard.” [1] https://pages.cs.wisc.edu/~dewitt/includes/paralleldb/ieee90.pdf https://pages.cs.wisc.edu/~dewitt/includes/paralleldb/ieee90...