The Indexes | Internals for Interns

This article explores PostgreSQL's six different index types, each designed for specific use cases with unique internal structures and access patterns. It covers B-tree for general-purpose queries, Hash for equality comparisons, GiST for spatial and full-text search, GIN for inverted indexing of arrays and JSONB, SP-GiST for non-overlapping partitions, and BRIN for time-series data with physical correlation. Each index type is explained in detail, including its structure, how it works, and when to use it. The article emphasizes the importance of choosing the right index based on data characteristics and query patterns.