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* Replace underscores with hyphens * remove temporary code * fix style check * fix collapse
19 lines
575 B
Markdown
19 lines
575 B
Markdown
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toc_title: "\u61D2\u60F0"
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---
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# 懒惰 {#lazy}
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仅将表保留在RAM中 `expiration_time_in_seconds` 上次访问后几秒钟。 只能与\*日志表一起使用。
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它针对存储许多小\*日志表进行了优化，访问之间存在较长的时间间隔。
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## 创建数据库 {#creating-a-database}
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CREATE DATABASE testlazy ENGINE = Lazy(expiration_time_in_seconds);
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[原始文章](https://clickhouse.tech/docs/en/database_engines/lazy/) <!--hide-->
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