How to Fix MySQL Error - ER_SYNC_MASTER_DELAYED_DDL_SKIPPED

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

Understanding the ER_SYNC_MASTER_DELAYED_DDL_SKIPPED Error

The ER_SYNC_MASTER_DELAYED_DDL_SKIPPED error occurs when a MySQL server is unable to synchronize a delayed DDL (Data Definition Language) statement with the master server. DDL statements are used to define or modify the structure of database objects such as tables, indexes, or views. Delayed DDL statements are those that are executed at a later time, allowing other transactions to complete first.

When this error occurs, it means that the MySQL server was unable to synchronize the delayed DDL statement with the master server, resulting in the statement being skipped. This can lead to inconsistencies between the master and slave servers, causing potential data integrity issues.

Fixing the ER_SYNC_MASTER_DELAYED_DDL_SKIPPED Error

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

1. Check MySQL Replication Status

First, you need to check the replication status of your MySQL servers. Use the following command to view the replication status:

SHOW SLAVE STATUSG

Look for the "Slave_IO_Running" and "Slave_SQL_Running" fields. If both are set to "Yes," it means that replication is running correctly. If either of them is set to "No," you need to troubleshoot and fix the replication issue before proceeding.

2. Identify the Skipped DDL Statement

Next, you need to identify the skipped DDL statement. Look for the "Last_SQL_Error" field in the output of the previous command. It will provide information about the error that caused the DDL statement to be skipped.

3. Resolve the Replication Error

Once you have identified the error, you can take appropriate steps to resolve it. Common causes of replication errors include network connectivity issues, insufficient disk space, or conflicts with existing data. Address the underlying issue and ensure that replication is functioning correctly.

4. Manually Execute the Skipped DDL Statement

If the replication error has been resolved, you can manually execute the skipped DDL statement on the slave server. Use the following command:

SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1;

Replace "1" with the appropriate number if multiple statements were skipped. Then, execute the following command to start replication:

START SLAVE;

This will resume replication and apply the skipped DDL statement on the slave server.

Summary

The ER_SYNC_MASTER_DELAYED_DDL_SKIPPED error in MySQL can be resolved by checking the replication status, identifying the skipped DDL statement, resolving any replication errors, and manually executing the skipped statement. By following these steps, you can ensure that your MySQL replication is functioning correctly and avoid potential data integrity issues.

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