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MySQL 9.0 Reference Manual / ... / Replication / Replication Notes and Tips / Replication Features and Issues / Replication and User Name Length
The maximum length for user names in MySQL 9.0 is 32 characters. Replication of user names longer than 16 characters fails when the replica runs a version of MySQL previous to 5.7, because those versions support only shorter user names. This occurs only when replicating from a newer source to an older replica, which is not a recommended configuration.
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