What is the maximum number of tables that MySQL can handle?
Here's an official answer from MySql: https://dev.mysql.com/doc/refman/8.0/en/database-count-limit.html
8.4.5 Limits on Number of Databases and Tables
MySQL has no limit on the number of databases. The underlying file system may have a limit on the number of directories.
MySQL has no limit on the number of tables. The underlying file system may have a limit on the number of files that represent tables. Individual storage engines may impose engine-specific constraints. InnoDB permits up to 4 billion tables.