1.

What are two important properties of MongoDB replication?

Answer»

Shard KEY selection is based on the workload. Since the first query is being used 90% it should be DRIVING the selection for selection of shard key.

Combination of fields from that query would MAKE the best shard key. This eliminates option b, C and d.

Option a and e uses a subset of fields from the most used workload and both can be shard key but option has more fields and so would be more suitable.



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