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Help Center/ Data Replication Service/ Troubleshooting/ Failure Cases/ Real-Time Migration and Synchronization from MySQL to TaurusDB/ Full or Incremental Phase Error: Illegal mix of collations (utf8mb4_0900_ai_ci,IMPLICIT) and (utf8mb4_general_ci,IMPLICIT) for operation

Full or Incremental Phase Error: Illegal mix of collations (utf8mb4_0900_ai_ci,IMPLICIT) and (utf8mb4_general_ci,IMPLICIT) for operation

Updated on 2025-02-17 GMT+08:00

Scenarios

During a full or incremental migration or synchronization, an error is reported, and the log information is as follows: Illegal mix of collations (utf8mb4_0900_ai_ci,IMPLICIT) and (utf8mb4_general_ci,IMPLICIT) for operation

Possible Causes

The sorting rule of the source MySQL 5.* character set utf8mb4 is utf8mb4_general_ci, and that of the destination GaussDB(for MySQL) character set utf8mb4 is utf8mb4_0900_ai_ci. An error is reported, indicating that the sorting rules are inconsistent.

Solution

  • Solution 1
    1. Run the SQL statement in the destination database to change the character set sorting rule of the corresponding column to utf8mb4_0900_ai_ci. For example, to change the character set sorting rule of column c1 in table test_collation_1 to utf8mb4_0900_ai_ci, run the following command:
       ALTER TABLE test_collation_1 MODIFY COLUMN c1 VARCHAR(16) COLLATE utf8mb4_0900_ai_ci;
    2. In the task list, locate the target task and click Resume in the Operation column to resume the task.
  • Solution 2
    1. Delete all columns containing collate utf8mb4_general_ci from the source database table.
    2. In the task list, locate the target task and click Reset in the Operation column to reset the task. Alternatively, create a DRS task again.
  • Solution 3
    1. Run the SQL statement in the destination database to change the character set sorting rule of the destination database to utf8mb4_0900_ai_ci.
      SET GLOBAL default_collation_for_utf8mb4='utf8mb4_general_ci';
    2. In the task list, locate the target task and click Reset in the Operation column to reset the task. Alternatively, create a DRS task again.

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