Answer
Write concern defines how strictly MongoDB should confirm a write, ranging from w:1 (primary only) to w:majority for higher durability.
Quick Answer
Write concern controls how many replica set members must acknowledge a write before MongoDB considers it successful. w:1 (default): primary acknowledges. w:majority: majority of members must acknowledge - safer, slower. w:0: fire and forget. Higher write concern = stronger durability guarantee but higher latency. Choose based on your data loss tolerance.
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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