Answer
A filtered index stores only rows matching a condition.
It reduces index size and improves seek performance for selective queries.
Quick Answer
A filtered index only indexes rows that match a WHERE condition. If 90% of your rows are "archived" and queries only touch "active" ones, a filtered index on IsActive = 1 is tiny, fast, and highly selective. Much cheaper than a full index and often a perfect fit for status or soft-delete columns.
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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