Does MongoDB need Compaction?: MongoDB and WiredTiger Engine Internals

Oct 11, 2025 · 4 min read · Hi everyone, this is Soo. I’m a MongoDB DBA, and today I’m going to talk about MongoDB Compaction — and about the WiredTiger storage engine as well. Why Compaction Matters The bottom line is: MongoDB might need compaction when there are lots of DML o...