客户将MySQL 5.7升级至8.0，升级后MySQL 8.0无法启动报数据字典不一致Data Dictionary initialization failed。

客户名称: 市政相关

数据类型: MySQL 8.0

数据库大小: 6GB

故障检测: MySQL 8.0无法启动，报错如下：

2023-10-10T12:32:25.427710Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
2023-10-10T12:32:25.474505Z 1 [ERROR] [MY-012209] [InnoDB] Multiple files found for the same tablespace ID:
2023-10-10T12:32:25.474506Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 27 = ['sakila\staff.ibd', 'xlife_city_brain\a*****_trend.ibd']
2023-10-10T12:32:25.474507Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 29 = ['world\city.ibd', 'xlife_city_brain\bi*****_total.ibd']
2023-10-10T12:32:25.474508Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 30 = ['world\country.ibd', 'xlife_city_brain\bi*****_usage.ibd']
2023-10-10T12:32:25.474509Z 1 [ERROR] [MY-012930] [InnoDB] Plugin initialization aborted with error Failed, retry may succeed.
2023-10-10T12:32:25.474510Z 1 [ERROR] [MY-010334] [Server] Failed to initialize DD Storage Engine
2023-10-10T12:32:25.474511Z 0 [ERROR] [MY-010020] [Server] Data Dictionary initialization failed.

使用公司研发的MySQL数据库恢复工具从MySQL 8.0的ibd数据文件恢复数据。

修复结果: 数据恢复率达100% 客户非常满意。将恢复出来的业务表的数据导入客户生产环境可以直接使用没有任何问题。

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