The Indexes
When you create an index in PostgreSQL, you might think there’s just one type of index structure working behind the scenes. But PostgreSQL actually provides six different index types, each engineered for specific use cases with completely different internal structures and access patterns.
This is the final stop on our SQL Query Roadtrip. In the previous article , we explored how PostgreSQL’s execution engine uses the Volcano model to transform abstract query plans into concrete operations. Before that, we covered parsing, analysis, rewriting, and planning. Now we’re diving into one of the most critical components that makes all of this fast: indexes.