16.8 Data Dictionary Limitations

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MySQL 8.4 Reference Manual Including MySQL NDB Cluster 8.4

This section describes temporary limitations introduced with the MySQL data dictionary.

• Manual creation of database directories under the data directory (for example, with mkdir) is unsupported. Manually created database directories are not recognized by the MySQL Server.
• DDL operations take longer due to writing to storage, undo logs, and redo logs instead of .frm files.