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I’m merely a fellow learner offering my 2-cent on the questions, don’t take my response as a gospel 😅. My take: both questions ask for ways to improve the DB read performance, with DB sharding listed as possible options. The difference between the 2 questions:
1st (electronics co): pick 2 most cost effective options,
2nd (legal consulting co): pick 3 (implied) cost effective options.
My understanding of DB sharding: it is highly complex, not typically the first choice solution. Complexity & Cost (logically) have a positive correlation. Thus in the 1st Q, DB sharding is out b/c it more expensive after the 2 most correct options. However, it makes the cut in the 2nd Q b/c it is among the 3 most correct options.
