Answer
Checkpoints flush in-memory data to disk periodically, ensuring durable restart points.
Quick Answer
WiredTiger checkpoints write a consistent snapshot of all in-memory data to disk every 60 seconds (or when the journal reaches 2GB). Checkpoints create a new consistent data file state. On crash recovery, MongoDB restores from the last checkpoint and then replays the journal to apply changes made after that checkpoint. This limits recovery time to the last 60 seconds of journal data.
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