Questions
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1Discuss replication in MongoDB?
2What is Replica Set?
3What are replica set members?
4Explain how the Raft consensus algorithm works within MongoDB Replication.
5What is a 'Rollback' in the context of a replica set, and how do you minimize its occurrence?
6Deep dive into Write Concern. What happens under the hood when you use { w: 'majority', j: true }?
7How does 'Read Preference' differ from 'Read Concern'?
8What is 'Replication Lag' and what are the top three reasons it occurs in a Node.js-backed system?
9Explain the 'Oplog' (Operations Log) architecture. What happens if the Oplog is too small?
10You are running a 3-node replica set across two data centers (2 nodes in DC-A, 1 node in DC-B). If the network link between the DCs breaks, what happens to your application's ability to write?
11When would you use a 'Delayed Member' or a 'Hidden Member'?
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Discuss replication in MongoDB?

Replication in MongoDB is a process that ensures data is duplicated and consistently synchronized across multiple servers. It enhances data availability, fault tolerance, and system resilience in case of hardware failures or network issues.

  1. 1

    In some cases, replication can provide increased read capacity as clients can send read operations to different servers.

  2. 2

    MongoDB uses replica sets for replication. A replica set is a group of MongoDB servers that maintain the same data set.