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Schema evolution
Prerequisites
- Completed Foundation module (ClickHouse architecture, schema design, and engines)
- Completed Ingestion module (understanding parts, merges, and ingestion patterns)
- Understanding of SQL and database schema concepts
- Familiarity with ClickHouse table engines and sorting keys
This learning module covers how to evolve ClickHouse schemas in production. You'll learn why schema evolution is challenging, what primitives ClickHouse provides, how to categorize changes by operational cost, common migration patterns, and how to meet developer expectations for schema changes.
Chapter 58
Multi-Tenant Migration Example
Video lesson Reading materials
Multi-Tenant Migration ExampleWhat you'll learn
- Why Schema Evolution is Hard: Understanding that schema evolution is an infrastructure problem, not just a database problem
- ClickHouse Primitives: The ALTER commands and operations available for schema changes
- Operational Costs: How to categorize changes by their cost: metadata, mutations, and full rewrites
- Migration Patterns: Common patterns for safely evolving schemas in production
- Developer Experience: How to meet developer expectations for schema evolution
- Practical Example: A complete example of evolving a real project to be multi-tenant