This article was originally published on AI Study Room . For the full version with working code examples and related articles, visit the original post. Database Indexing Strategies: B-Tree, Hash, GIN, GiST, and BRIN Explained Adding an index is the highest-ROI database optimization — a well-chosen index can turn a 30-second sequential scan into a sub-millisecond index lookup. But indexing is full of trade-offs: each index slows writes, consumes storage, and requires the query planner to choose it. This guide covers index types, when to use each, and how to verify they are actually working.…