Answer
Index filters restrict query planner index usage, helping force specific indexes for performance tuning.
Quick Answer
Index filters let you specify which indexes the planner can use for a given query shape, overriding the planner's automatic choice. Set with planCacheSetFilter. Useful when the planner consistently picks a suboptimal plan and query hints aren't practical. More persistent than hints (survive restarts in MongoDB 6+). Use sparingly - usually fixing the query or index design is better.
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SugharaIQ Editorial Team
Verified Answer
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Source: SugharaIQ