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# 性能优化
[性能变慢的因素](./bad/README.md)

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本章列举对ClickHouse性能有影响的操作，主要从存储、查询方面来讲。
# 存储相关
## Nullable
使用`Nullable`类型会对性能产生负面影响，在设计数据库的时候要避免使用`Nullable`。