---
title: "有人把UUIDv7骂醒了：时间戳和单调性都没你想的稳 - Angryecho"
description: "Robert Alexander的长文《UUIDv7 doesn't have the properties you think it does》10月19日发布，10月24日又在HN被顶起来。"
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# **有人把UUIDv7骂醒了：时间戳和单调性都没你想的稳**

Robert Alexander的长文《UUIDv7 doesn't have the properties you think it does》10月19日发布，10月24日又在HN被顶起来。核心观点：很多人以为UUIDv7=单调递增+可信创建时间+不可猜测，但RFC 9562允许改时间戳；Python标准库等实现在时钟回拨、计数溢出时，嵌入时间可能和真实创建时间差很远。

文中还给了Postgres文档提醒：`uuid_extract_timestamp`提取值「不一定精确等于生成时刻」。对把UUIDv7当创建时间主键的人，这是泼冷水。

你们库表还在用uuidv7当排序键吗？

> \[1] [UUIDv7 doesn't have the properties you think it does](https://alexsci.com/blog/uuidv7-is-weird/)，2026年10月19日。
>
> \[2] [HN条目](https://news.ycombinator.com/item?id=50211746)，2026年10月24日。

#UUIDv7 #数据库 #Postgres #Python #主键

排序方式 :

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