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update docs
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fengzhao committed Oct 15, 2024
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4 changes: 2 additions & 2 deletions docs/postgresql/03.体系架构.md
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Expand Up @@ -31,9 +31,9 @@ To be able to use the cluster,you must first initialize 2 (create) it. The direc
第一次听到这个定义也许会令人疑惑,PostgreSQL中的术语“数据库集簇”,并非意味着“一组数据库服务器”。 一个PostgreSQL服务器只会在单机上运行并管理单个数据库集簇。


- 第一层是实例(Instance)
- 第一层是实例(Instance);PostgreSQL is a program that belongs to the class of database management systems. When this program is running, we call it a PostgreSQL server, or instance

- 第二层是数据库(Database);一个实例下可以有多个数据库。**每个数据库之间是完全独立的**
- 第二层是数据库(Database);一个实例下可以有多个数据库。**每个数据库之间是完全独立的**它们组在一起就叫 ` a database cluster`

- 第三层是模式(Schema);每个数据库下面可以有多个Schema;其中"public"是数据库创建时产生的。

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