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MySQL 8.0 Reference Manual  /  ...  /  Replication and User Name Length

17.4.1.38 Replication and User Name Length

The maximum length of MySQL user names is 32 characters. Replication of user names longer than 16 characters to a slave earlier than MySQL 5.7 that supports only shorter user names will fail. However, this should occur only when replicating from a newer master to an older slave, which is not a recommended configuration.


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