What considerations need to be made for evolving schemas in distributed databases to ensure data consistency?
- Distributed databases should never have evolving schemas
- Schema changes should be applied simultaneously to all nodes
- Schema changes should be applied sequentially with backward compatibility
- Schema changes should be applied only to a single node
When evolving schemas in distributed databases, it's important to apply changes sequentially with backward compatibility. This means making changes in a way that allows both old and new versions of the schema to coexist temporarily, ensuring data consistency during the transition. Applying changes simultaneously or only to a single node can lead to data inconsistencies.
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