Answer
Journaling writes operations to a journal file before applying them to data files, preventing data loss in crashes.
Quick Answer
Journaling writes every write operation to an on-disk journal (write-ahead log) before applying it to data files. If MongoDB crashes mid-write, it replays the journal on restart to recover to a consistent state. Enabled by default since MongoDB 3.2. Without journaling, a crash between the write and fsync can corrupt data files.
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SugharaIQ Editorial Team
Verified Answer
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Source: SugharaIQ