Answer
Multi-key indexes allow indexing array fields by indexing each element, enabling fast queries over arrays.
Quick Answer
Multi-key indexes are created on array fields. MongoDB creates an index entry for every element in the array. This allows efficient queries on array contents: find all users where tags contains "mongodb". MongoDB automatically detects and creates a multi-key index when you index an array field. Limitation: a compound index can have at most one multi-key field.
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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