Answer
MongoDB uses journaling to write operations to journal files before applying them, ensuring recovery after crashes.
Quick Answer
MongoDB ensures durability through: journaling (write-ahead log persists writes before applying), WiredTiger checkpoints (periodic full data snapshots), and replica set replication (data copied to multiple nodes). On crash, MongoDB replays the journal from the last checkpoint to restore to a consistent state. With write concern majority + journaling enabled, committed writes survive node failures.
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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