|-254||Failed to query the target instance information||Please make sure that the target instance is normal and is not performing any other tasks during migration.|
|-419||The target instance version is non-compliant for migration from Alibaba Cloud||For data migration from Alibaba Cloud, only TencentDB 5.6 target instances are supported, and their synchronization status must be async. Migration to target instances in semi-sync or strong sync status is not supported currently.|
|-256||Failed to connect to the source instance||Please check the connection permission of the source instance account, make sure that a connection to the source instance can be established by entering account and password, and check the connectivity of the source instance.|
|-255||Failed to query the source instance information||Please make sure that the source instance can be connected normally during migration, and do not modify the corresponding account permission.
|-260||The GTID configurations of the source and target instances are non-compliant|
|-261||For online migration, binlog needs to be enabled for the source instance||For online migration, if
|-262||For online migration, binlog cannot be in
||For online migration, binlog of the source instance should be in
|-264||For online migration, the source instance's
||For online migration,
|-418||For migration of specified tables (not schema),
||For migration of specified tables in online and backup modes,
|2001041||The source instance is a syncing slave, but
||If the source instance is a slave being synced,
|2001040||The source instance is on version 5.7, which contains unsupported column types||For v5.7 source instances, columns in JSON format and virtual columns are not supported.|
|-257||The source instance and target instance are not compatible||Compatibility requirements:
Migration between instances on the same major MySQL version is supported.
For different major versions, only migration from v5.1 to v5.5 and from v5.5 to v5.6 is supported.
The source instance and target instance should have the same
|-258||The target instance capacity is insufficient in online or backup mode||The target instance capacity needs to be at least 1.3 times that of the source instance.|
|-259||The target instance is not empty for instance-level migration||For instance-level migration, please make sure that there are no user-created databases in the target instance so as to prevent overwrites.|
|2001037||For table migration, the entered table is not found in the source instance||To migrate tables, please make sure that they can be found in the source instance.|
|-268||The database name already exists||For database-level table migration, please make sure that neither identical databases nor identical tables exist in both the source instance and target instance.|
|-269||The table name already exists.||For table migration, please make sure that no identical table names exist in both the source instance and target instance.|
|-265||For table migration, the table that foreign keys rely on is not in the target table||-|
|-266||The target table has an unsupported storage engine||For the source table, storage engine support is as follows:
|-420||The source TokuDB is compressed||
|-421||The source TokuDB has a cluster index||There is a table whose
|-292||The RO status of the target instance is exceptional||To initiate a migration task, the target instance's RW and RO status must be normal.|
|-405||There is a table whose
||It is recommended to change the source instance tables to InnoDB tables (not in row_format). After the change of the format, the database table will be rebuilt.|
|-417||The primary-secondary relationship between the source instance and target instance is exceptional.||Please check whether the network connection to the source instance is normal and whether doublewrite is caused by user writes to the target instance during migration.|
|-253||A user request for canceling the task is received||After a user request for canceling the migration task is received, the task will be canceled and then rolled back.|
|-407||Incorrect input parameters||The input parameters are incorrect. Please check whether the parameters are in valid format, such as table name.|
|-411||Failed to check the account permission in the source instance||Please provide details on the eligible source instance account permission and make sure that the user account has the required permission based on the task configuration.
For example, session needs to be in binlog format for full detection, which requires the super permission. Solution: 1. The super permission is not required for sampling detection; 2. Grant the super permission to the account.
|6001000||The backup system is exceptional||Please submit a ticket to contact us.|
|-41||Data sync failed due to a primary-secondary exception||Please submit a ticket to contact us.|
|996||Internal error. The migration mode and comparison mode have different configurations on the backend. An error will occur if the configuration file cannot be found||Please submit a ticket to contact us.|