Answer
Cache pressure arises from oversized working sets. Solutions include increasing WT cache, reducing document size, removing heavy indexes, and archiving cold data.
Quick Answer
WiredTiger cache pressure (cache full, high eviction rate) happens when: working set exceeds cache size, large documents prevent efficient caching, too many indexes all needing to be in memory. Fix: increase WiredTiger cache size (storage.wiredTiger.engineConfig.cacheSizeGB), add RAM, reduce index count, use projection to avoid reading large documents fully, or shard to distribute data across more RAM.
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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