Intermediate LevelMongoDB & Mongoose
What are Hidden and Delayed Replica Set members used for in disaster recovery?
❓ Interview Prompt: Explain Hidden members (priority: 0, hidden: true), Delayed members (slaveDelay), and recovering from accidental data deletes.
Delayed Replica Set members mirror data behind a fixed lag (e.g. 8 hours), providing a fallback to recover from accidental human errors or dropped tables.
Code Implementation Example
typescript
console.log('Delayed replica set member configured with slaveDelay: 28800 (8 hours)');💡Delayed replica set member disaster recovery pattern.
🎯 Interview Key Takeaway
Deploy delayed replica members as a safety buffer to recover from accidental database drop commands.
#Delayed Replica#Disaster Recovery#Replica Sets#Intermediate
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