Question

Point out the wrong statement.

(a) Read preferences consider the value of a tag when selecting a member to read from

(b) Shard ranges are always exclusive of the lower value and inclusive of the upper boundary

(c) Write concerns do not use the value of a tag to select a member except to consider whether or not the value is unique

(d) None of the mentioned

The question was posed to me in an international level competition.

I'm obligated to ask this question of Operational Segregation topic in division Monitoring MongoDB and Optimization Strategies for MongoDB of MongoDB

Answer 1

Right answer is (c) Write concerns do not use the value of a tag to select a member except to consider whether or not the value is unique

Easiest explanation: Shard ranges are always inclusive of the lower value and exclusive of the upper boundary.