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In the video, I delved into how Instagram efficiently searches for hashtags using partial indexes in PostgreSQL. Instagram relies heavily on PostgreSQL for usercreated data. By utilizing partial indexes, Instagram optimized hashtag searches by indexing only popular hashtags with over 100 photos, reducing the index size significantly. This optimization technique improved query performance, showcasing the power of understanding database features like partial indexes. Applying simple first principles led to a substantial enhancement in database performance, demonstrating the importance of database knowledge in optimizing production systems.

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