MySQL 8.0 End of Life: What Breaks When Upgrading to 8.4 and How to Check

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MySQL 8.0 reached end of life in April 2026, so Oracle no longer provides community security fixes for it. The recommended target is MySQL 8.4, the current long-term support release, which can be reached through a direct in-place upgrade. Several features still accepted in 8.0 were removed in 8.4, and these often fail silently until logins or server startup break. The guide recommends running MySQL Shell's upgrade checker first, since it detects many of these issues automatically. Common problem areas include accounts using mysql_native_password, removed configuration options, outdated replication commands, and changed InnoDB defaults.

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