# Which Argo CD component cannot be horizontally scaled because it uses an in-memory database?

Argo CD, Medium (Advanced), Performance & Scaling. https://k8wiz.com/uquiz/which-argo-cd-component-cannot-be-horizontally-scaled-because-it-uses-an-in-memory-database

- A. argocd-repo-server
- B. argocd-server
- C. argocd-application-controller
- D. argocd-dex-server

**Answer:** argocd-dex-server

**Explanation:** The `argocd-dex-server` uses an in-memory database, so running multiple instances would lead to inconsistent data.