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How to Fix MySQL Error – ER_SYNC_MASTER_REJECTED_DML

How to Fix MySQL Error – ER_SYNC_MASTER_REJECTED_DML

MySQL is a popular open-source relational database management system used by many websites and applications. However, like any software, it can encounter errors that can disrupt its normal operation. One such error is the ER_SYNC_MASTER_REJECTED_DML error. In this article, we will explore what this error means and how to fix it.

Understanding the ER_SYNC_MASTER_REJECTED_DML Error

The ER_SYNC_MASTER_REJECTED_DML error occurs when a MySQL server is configured as a replication master and rejects a data modification language (DML) statement from a replication slave. This error typically happens when the master server has the sync_binlog option enabled, which ensures that the binary log is synchronized to disk after every write operation.

When a replication slave sends a DML statement to the master, the master checks if the statement can be executed successfully. If the statement fails to execute, the master rejects it and sends an error message to the slave, resulting in the ER_SYNC_MASTER_REJECTED_DML error.

Fixing the ER_SYNC_MASTER_REJECTED_DML Error

To fix the ER_SYNC_MASTER_REJECTED_DML error, you can follow these steps:

1. Check the Error Message

When the error occurs, MySQL provides an error message that can help identify the cause of the problem. Look for the error message in the MySQL error log or in the output of the SHOW SLAVE STATUS command on the replication slave.

2. Identify the Cause

The error message usually provides information about the specific DML statement that was rejected. Analyze the statement and try to identify any potential issues, such as incorrect syntax, missing tables or columns, or conflicting data types.

3. Resolve the Issue

Once you have identified the cause of the error, take the necessary steps to resolve it. This may involve correcting the syntax of the DML statement, creating missing tables or columns, or ensuring that the data types match between the master and slave servers.

4. Retry the Replication

After resolving the issue, you can retry the replication by restarting the slave server or using the START SLAVE command. Monitor the replication process to ensure that the ER_SYNC_MASTER_REJECTED_DML error does not occur again.

Summary

The ER_SYNC_MASTER_REJECTED_DML error in MySQL occurs when a replication master rejects a data modification language (DML) statement from a replication slave. To fix this error, you need to check the error message, identify the cause, resolve the issue, and retry the replication. If you encounter this error, it is important to address it promptly to ensure the smooth operation of your MySQL replication setup.

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