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What are database indexes and how do they speed up queries.

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2 answers published. Last candidate submission on Jun 17 2026, 4:35am PDT. Interview question asked to Software Engineers interviewing at Mindtree, Juniper Networks, Walmart and other companies. Original question asked: What are database indexes and how do they speed up queries.. Question last reported by a candidate interviewing at Wattpad for a Software Engineer interview on Jul 7 2026, 9:51pm PDT.