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Add a tip for vid modification #1548

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Mar 11, 2022
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Add a tip for vid modification #1548

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Add a tip for vid modification
randomJoe211 Mar 11, 2022
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Update 3.vid.md
randomJoe211 Mar 11, 2022
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4 changes: 3 additions & 1 deletion docs-2.0/1.introduction/3.vid.md
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Expand Up @@ -44,10 +44,12 @@ VID 的生成工作完全交给应用端，有一些通用的建议：

- 如果用 hash 方式生成 int64 VID：在有 10 亿个点的情况下，发生 hash 冲突的概率大约是 1/10。边的数量与碰撞的概率无关。

## 定义和修改 VID 的数据类型
## 定义和修改 VID 与其数据类型

VID 的数据类型必须在[创建图空间](../3.ngql-guide/9.space-statements/1.create-space.md)时定义，且一旦定义无法修改。

VID 必须在[插入点](../3.ngql-guide/12.vertex-statements/1.insert-vertex.md)时设置，且一旦设置无法修改。

## "查询起始点"(`start vid`) 与全局扫描

绝大多数情况下，Nebula Graph 的查询语句（`MATCH`、`GO`、`LOOKUP`）的执行计划，必须要通过一定方式找到查询起始点的 VID（`start vid`）。
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