Answer
Primary acknowledges writes only after majority replication. Elections ensure nodes with consistent oplogs become primary, preventing divergence.
Quick Answer
Data loss prevention during failover: use w:majority write concern so acknowledged writes are on a majority of nodes. Enable journaling. Size your replica set with 3+ members for a proper majority. Monitor replication lag - excessive lag means secondaries might not have recent writes when failover occurs. Test failover regularly. Atlas automates replica set management and monitors for failover events.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ