ClickHouse Rate Limits & Concurrency

Overview

ClickHouse has no REST API rate limits like a SaaS product. Instead it enforces server-side concurrency limits, memory quotas, and per-user settings that control resource usage. This skill configures those server-side limits and pairs them with client-side controls so an application stays within them under load.

Prerequisites

• ClickHouse admin access (or Cloud console) to create quotas and settings profiles.
• The @clickhouse/client Node package for the client-side patterns.
• A rough target for peak concurrent queries and per-query memory.

Instructions

Work top-down: cap resources at the server, then make the client respect the cap.

Step 1: Know the server-side limits