MySQL升级路线

Upgrade Paths
• Upgrade is only supported between General Availability (GA) releases.

• Upgrade from MySQL 5.6 to 5.7 is supported. Upgrading to the latest release is recommended before upgrading to the next version.    
  For example, upgrade to the latest MySQL 5.6 release before upgrading to MySQL 5.7.

• Upgrade that skips versions is not supported. For example, upgrading directly from MySQL 5.5 to 5.7 is not supported.

• Upgrade within a release series is supported. For example, upgrading from MySQL 5.7.x to 5.7.y is supported. Skipping a release is also supported.
  For example, upgrading from MySQL 5.7.x to 5.7.z is supported.

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升级路径

•仅在通用可用性（GA）版本之间支持升级。

•支持从MySQL 5.6升级到5.7。建议在安装之前升级到最新版本升级到下一版本。
 例如，请在升级到MySQL 5.7之前升级到最新的MySQL 5.6版本。

•不支持跳过版本的升级。例如，直接从MySQL 5.5升级到5.7是不支持。

•支持在版本系列内升级。例如，从MySQL 5.7.x升级到5.7.z支持。还支持跳过发布。
 
 例如，从MySQL 5.7.x升级到5.7.z是支持的。