What is the maximum capacity limit of a mysql database?

The maximum capacity of a MySQL database is determined by the limitations of the storage engine and operating system. Here are some common restrictions:

1. MyISAM engine: Individual table files are limited to 4GB, with a total database capacity limit of 64TB.
2. InnoDB engine: The limit for a single table file and the total database capacity is 64TB.
3. The NDB Cluster storage engine does not have a specific limit on the size of individual tables or the overall database capacity, but it may be constrained by the operating system.

It should be noted that the capacity limit of MySQL may be restricted by the operating system, hardware, and configuration, therefore the actual usage may vary.