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update the foreign key feature description (#15771) #15813

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Dec 18, 2023
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update the foreign key feature description (#15771) #15813

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2 changes: 1 addition & 1 deletion foreign-key.md
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Expand Up @@ -10,7 +10,7 @@ summary: TiDB 数据库中外键约束的使用概况。
> **警告：**
>
> - 外键功能目前为实验特性，不建议在生产环境中使用。该功能可能会在未事先通知的情况下发生变化或删除。如果发现 bug，请在 GitHub 上提 [issue](https://github.com/pingcap/tidb/issues) 反馈。
> - 外键功能通常适用于为中小规模的数据提供完整性和一致性约束校验，但是在大数据量和分布式数据库系统下，使用外键可能会导致严重的性能问题，并对系统产生不可预知的影响。如果计划使用外键，请进行充分验证后谨慎使用。
> - 外键功能通常用于强制执行[参照完整性](https://zh.wikipedia.org/wiki/%E5%8F%82%E7%85%A7%E5%AE%8C%E6%95%B4%E6%80%A7)约束检查。使用该功能可能会导致性能下降，在将其应用于性能敏感的场景前，建议先进行全面测试。

外键是在子表中定义的，语法如下：

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