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MySQL 9.0 Reference Manual  / ...  / Optimization  / Optimizing Database Structure  /  Limits on Number of Databases and Tables

10.4.5 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.