第 4 章 MySQL 降级Chapter 4 Downgrading MySQL

Notes

在进行降级之前，请确保您了解MySQL 的发布模型，包括 MySQL 长期支持（LTS）版本和创新版本。Make sure you understand the MySQL release model for MySQL long-term support (LTS) and Innovation releases before proceeding with a downgrade.
通过遵循第 19.5.3 节，“升级或降级复制拓扑”中描述的滚动降级方案来降级复制拓扑，该方案使用支持的单服务器方法之一对每个单独服务器进行降级。A replication topology is downgraded by following the rolling downgrade scheme described at Section 19.5.3, “Upgrading or Downgrading a Replication Topology”, which uses one of the supported single-server methods for each individual server downgrade.
在本文件中，每月快速更新（MRU）和热修复也被视为发布版本。Monthly Rapid Updates (MRUs) and hot fixes also count as releases in this documentation.

表 4.1 MySQL 服务器降级路径Table 4.1 Downgrade Paths for MySQL Server

降级路径Downgrade Path	路径示例Path Examples	支持的降级方法Supported Downgrade Methods	注释Notes
在 LTS 系列内Within an LTS series	8.4.y LTS 到 8.4.x LTS8.4.y LTS to 8.4.x LTS	原地升级、逻辑导出导入、MySQL 克隆，或使用复制In-place, logical dump and load, MySQL Clone, or by using replication
从 LTS 或 Bugfix 系列到前一个 LTS 或 Bugfix 系列From an LTS or Bugfix series to the previous LTS or Bugfix series	8.4.x LTS 到 8.0.y8.4.x LTS to 8.0.y	逻辑导出导入或使用复制Logical dump and load or by using replication	仅支持用于回滚（即，如果数据未应用任何新的服务器功能）Only supported for rollback purposes (that is, if no new server functionality has been applied to the data)
从 LTS 或 Bugfix 系列到创新系列在前一个 LTS 系列之后From an LTS or Bugfix series to an Innovation series after the previous LTS series	8.4.x LTS 到 8.3.0 创新8.4.x LTS to 8.3.0 Innovation	逻辑导出导入或使用复制Logical dump and load or by using replication	仅支持用于回滚（即，如果数据未应用任何新的服务器功能）Only supported for rollback purposes (that is, if no new server functionality has been applied to the data)
从创新系列内部From within an Innovation series	9.6 到 9.69.6 to 9.6	逻辑导出导入或使用复制Logical dump and load or by using replication	仅支持用于回滚（即，如果数据未应用任何新的服务器功能）Only supported for rollback purposes (that is, if no new server functionality has been applied to the data)

不支持降级到 MySQL 5.7 或更早版本。Downgrading to MySQL 5.7 or earlier is not supported.

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