Answer
Write concern specifies how many nodes must acknowledge a write. Higher levels improve durability but increase latency.
Quick Answer
Write concern defines durability guarantees. w:1: primary wrote to memory. w:majority: majority of replica set persisted the write - survives primary failure. j:true: write is persisted to journal before acknowledging (survives crashes). For financial data or anything you can't lose: use {w: "majority", j: true}. Higher concern = higher latency.
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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