/4 Level 0 segments are periodically merged into Level 1 segments. This process is called 𝐜𝐨𝐦𝐩𝐚𝐜𝐭𝐢𝐨𝐧.

The biggest difference is probably this:

🔹B-Tree enables faster reads
🔹LSM-Tree enables fast writes

— Alex Xu (@alexxubyte) October 20, 2022