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20 lines
528 B
Markdown
20 lines
528 B
Markdown
---
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slug: /zh/engines/database-engines/lazy
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sidebar_position: 31
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sidebar_label: Lazy
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---
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# Lazy {#lazy}
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在最后一次访问之后，只在RAM中保存`expiration_time_in_seconds`秒。只能用于\*Log表。
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它是为存储许多小的\*Log表而优化的，对于这些表，访问之间有很长的时间间隔。
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## 创建数据库 {#creating-a-database}
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``` sql
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CREATE DATABASE testlazy ENGINE = Lazy(expiration_time_in_seconds);
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```
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[来源文章](https://clickhouse.com/docs/en/database_engines/lazy/) <!--hide-->
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