7/11日开源数据库软件服务商percona发布重要警告，最新的mysql版本存在重大bug，原文如下
Do Not Upgrade to Any Version of MySQL After 8.0.37
Warning!
Recently, Jean-François Gagné opened a bug on bug.mysql.com #115517; unfortunately, the bug is now private.
However, the bug looks quite serious. We at Percona have performed several tests and opened the issue PS-9306 to investigate the problem.
In short, what happens is that if you create a large number of tables, like 10000, the mysql daemon will crash at restart.
Currently, we have identified that the following versions are affected:
MySQL 8.0.38
MySQL 8.4.1
MySQL 9.0.0
We have not yet identified the root cause or a workaround. As such, we suggest that all users do not adopt any of the MySQL versions mentioned until a fix is released.
If you want to test it yourself, just install one of the mentioned MySQL versions and run a script like the one used in our issue PS-9306.
原文链接：https://www.percona.com/blog/do-not-upgrade-to-any-version-of-mysql-after-8-0-37/#
简而言之
如果表的数量超过10000个，mysql可能会在重启时崩溃，该bug在MySQL 8.0.38
MySQL 8.4.1 MySQL 9.0.0 三个版本被确认。
重要提醒！生产系统请不要升级到以上版本！