RDS MySQL replication issues


Hi folks, We have a MySQL replica instance running out of sync for a few days with the below errors. Not sure the issue is due to internal RDS db replication settings. Is there any solution to this issue? Thank you, in advance for your input.

Errors: [ERROR] [MY-010584] [Repl] Slave SQL for channel ‘’: Worker 1 failed executing transaction ‘ANONYMOUS’ at master log mysql-bin-changelog.052832, end_log_pos 1176205; Error ’Illegal mix of collations (utf8_general_ci,IMPLICIT) and (utf8mb4_general_ci,COERCIBLE) for operation ‘concat’' on query. Default database: ‘’. Query: ‘UPDATE tenant_marbellaclub.billing_saleline SET description = CONCAT(description, ’ No :hot_pepper: picante’) WHERE id IN (90756)’, Error_code: MY-001267

2 Answers

AWS Support can help you resolve such specific issue that requires investigation into your account. Please submit a support case from within your AWS account. Thanks.

answered a year ago

If you haven't resolved this problem yet, it appears your @@collation_connection is at odds with the collation on the description column, which is likely the result of your connection and column having different character sets.

You are trying to concat the description value with the literal ’No :hot_pepper: picante’. MySQL interprets the description column as character set utf8, collation utf8_general_ci. Your string literal has a character set of utf8mb4, collation utf8mb4_general_ci. MySQL's use of "utf8" allows up to three character bytes, while the actual full characterset "utf8mb4" allows up to four, matching Unicode standard.

You probably want to switch over any utf8 columns to utf8mb4. This will also fix the collation issue, as utf8mb4_general_ci is the default collation for utf8mb4.

answered 7 months ago

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