Q39: Explain Read Concern vs Read Preference.
- Read Preference: Controls where reads are routed (
primary,primaryPreferred,secondary,secondaryPreferred,nearest). - Read Concern: Controls data isolation and consistency level (
local,majority,linearizable,snapshot).
Key Takeaways
- Read Preference = Node routing target.
- Read Concern = Data consistency level.
Knowledge Check
Which setting controls which replica set member node receives query read requests?