Answer
Large indexes consume memory, slow writes, and increase disk I/O, requiring careful index design for efficiency.
Quick Answer
Large indexes consume RAM in the WiredTiger cache. All indexes must fit in memory for optimal performance. Large indexes also slow down writes (each write must update all indexes). Monitor index size with db.collection.stats(). Remove unused indexes regularly. Covered queries are only possible if the index fits in memory. Use db.collection.aggregate([{$indexStats:{}}]) to find unused indexes.
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