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面试官问：MySQL的自增 ID 用完了，怎么办？

更新时间：2025-06-25 12:50:12

你直接说，给你普及一个常识，一个u64，基本可以把千分之一的宇宙天体，每个标一个数。

标记整个宇宙，只需要u64往前面再加3个10进制数。

怎么，你的业务是要上天？ —————— 再普及一个常识，一个ipv6，是128位。

***如宇宙中的天体像地球一样，可以把整个宇宙中的，每一个天体，中的每一粒沙子，分配一个ipv6地址。

而且，还绰绰有余。

面试官问：MySQL的自增 ID 用完了，怎么办？

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