# Storage Engines

The component that actually manages data on disk and in memory.

## 🎯 Goals

- [ ] Differentiate database **front-end** (SQL, API) from storage engine
- [ ] Learn when different engines make sense

## 📚 Checklist

- [ ] Understand page/segment-based storage vs log-structured storage
- [ ] Compare high-level **B-Tree** engines vs **LSM-tree** engines
- [ ] Map engines to workloads (OLTP vs OLAP)

## 🔗 Related

- [[B-Tree vs LSM]]
- [[Buffer Pools]]
- [[WAL Internals]]