LESSON 1.2
Vector databases and indexes
Learn key techniques and workflows in Retrieval-Augmented Generation from Scratch.
4m
advanced
8,658 students
Overview
Exact nearest-neighbour search does not scale, so vector indexes trade a little recall for a lot of speed. Knowing the trade-off keeps you out of trouble.
In this lesson you will:
- Understand approximate nearest neighbour search
- Trade recall against latency deliberately
- Store metadata alongside vectors for filtering
Pro Tip
Use caching and revalidation wisely to ensure your app stays fast and data remains fresh without unnecessary requests.