Answer
Compression reduces disk usage and improves I/O performance by reading and writing fewer bytes.
Quick Answer
WiredTiger compresses data using snappy (default - fast, moderate compression), zlib (slower, better compression), or zstd (MongoDB 4.2+ - best balance). Compression is applied to both data and indexes on disk. This reduces storage costs significantly and can improve I/O performance since less data is read from/written to disk. CPU cost of compression is usually worth the I/O savings.
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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