MySQL · December 20, 2023

How to Fix MySQL Error - ER_SYNC_MASTER_DELAYED_DDL_FAILED

How to Fix MySQL Error - ER_SYNC_MASTER_DELAYED_DDL_FAILED

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_FAILED error. In this article, we will explore what this error means and how to fix it.

Understanding the ER_SYNC_MASTER_DELAYED_DDL_FAILED Error

The ER_SYNC_MASTER_DELAYED_DDL_FAILED error occurs when a MySQL server is unable to synchronize a delayed DDL (Data Definition Language) statement with the master server. This error typically happens in a replication setup where there is a master-slave configuration.

When a delayed DDL statement is executed on the master server, it is supposed to be synchronized with the slave server. However, if the synchronization fails, the ER_SYNC_MASTER_DELAYED_DDL_FAILED error is thrown.

Possible Causes of the ER_SYNC_MASTER_DELAYED_DDL_FAILED Error

There can be several reasons why the synchronization of delayed DDL statements fails. Some common causes include:

  • Network connectivity issues between the master and slave servers.
  • Insufficient disk space on the slave server.
  • Replication lag due to high server load or slow network.
  • Incorrect configuration of replication settings.

Fixing the ER_SYNC_MASTER_DELAYED_DDL_FAILED Error

To resolve the ER_SYNC_MASTER_DELAYED_DDL_FAILED error, you can follow these steps:

1. Check Network Connectivity

Ensure that there are no network connectivity issues between the master and slave servers. Test the connection by pinging the servers from each other and make sure they can communicate without any problems.

2. Verify Sufficient Disk Space

Check the disk space on the slave server and ensure that it has enough free space to accommodate the replicated data. If the disk space is low, free up some space or allocate more storage to the server.

3. Monitor Replication Lag

Monitor the replication lag between the master and slave servers. If the lag is consistently high, it could indicate performance issues. Optimize the server configuration, database queries, or network settings to reduce the replication lag.

4. Review Replication Configuration

Double-check the replication configuration settings to ensure they are correctly set up. Verify the replication user credentials, replication mode, and other relevant settings. Make any necessary adjustments or corrections as needed.

Summary

The ER_SYNC_MASTER_DELAYED_DDL_FAILED error in MySQL can be caused by various factors such as network connectivity issues, insufficient disk space, replication lag, or incorrect configuration settings. To fix this error, it is important to check the network connectivity, verify sufficient disk space, monitor replication lag, and review the replication configuration. By addressing these issues, you can resolve the error and ensure smooth synchronization between the master and slave servers.

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