mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-15 02:41:59 +00:00
19 lines
480 B
Markdown
19 lines
480 B
Markdown
---
|
||
toc_priority: 31
|
||
toc_title: Lazy
|
||
---
|
||
|
||
# Lazy {#lazy}
|
||
|
||
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。
|
||
|
||
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。
|
||
|
||
## 创建数据库 {#creating-a-database}
|
||
|
||
``` sql
|
||
CREATE DATABASE testlazy ENGINE = Lazy(expiration_time_in_seconds);
|
||
```
|
||
|
||
[来源文章](https://clickhouse.com/docs/en/database_engines/lazy/) <!--hide-->
|