MySQL · December 20, 2023

How to Fix MySQL Error - ER_SYNC_MASTER_CONFIGURATION

How to Fix MySQL Error - ER_SYNC_MASTER_CONFIGURATION

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 need to be resolved. One such error is ER_SYNC_MASTER_CONFIGURATION, which occurs when there is a mismatch in the configuration between the master and slave servers in a MySQL replication setup.

Understanding MySQL Replication

MySQL replication is a process that allows data to be copied from one MySQL server (the master) to one or more MySQL servers (the slaves). This setup is commonly used to improve performance, provide redundancy, and enable load balancing.

In a replication setup, the master server records all changes to its database in binary log files. The slave servers then read these log files and apply the changes to their own databases, keeping them in sync with the master.

Common Causes of ER_SYNC_MASTER_CONFIGURATION Error

The ER_SYNC_MASTER_CONFIGURATION error typically occurs when there is a mismatch in the configuration parameters between the master and slave servers. Some common causes of this error include:

  • Incorrect server IDs: Each server in a replication setup must have a unique server ID. If two servers have the same ID, the replication process will fail.
  • Inconsistent binary log settings: The binary log settings on the master and slave servers must match. If they are different, the replication process will encounter errors.
  • Mismatched replication filters: Replication filters are used to specify which databases or tables should be replicated. If the filters on the master and slave servers do not match, the replication process will fail.

Fixing the ER_SYNC_MASTER_CONFIGURATION Error

To fix the ER_SYNC_MASTER_CONFIGURATION error, you need to ensure that the configuration parameters on the master and slave servers are consistent. Here are the steps to follow:

Step 1: Check server IDs

Verify that each server in the replication setup has a unique server ID. You can do this by checking the value of the server_id variable in the MySQL configuration file (my.cnf or my.ini). If two servers have the same ID, update one of them to a different value.

Step 2: Verify binary log settings

Ensure that the binary log settings on the master and slave servers match. Check the values of the log_bin and binlog_format variables in the MySQL configuration file. If they are different, update the slave server to match the master.

Step 3: Check replication filters

Review the replication filters on the master and slave servers to ensure they are consistent. The filters are defined using the replicate-do-db and replicate-ignore-db options in the MySQL configuration file. If the filters do not match, update the slave server to match the master.

Step 4: Restart MySQL

After making any configuration changes, restart the MySQL service on both the master and slave servers to apply the changes.

Summary

The ER_SYNC_MASTER_CONFIGURATION error in MySQL replication occurs when there is a mismatch in the configuration between the master and slave servers. To fix this error, you need to ensure that the server IDs, binary log settings, and replication filters are consistent. By following the steps outlined in this article, you can resolve the ER_SYNC_MASTER_CONFIGURATION error and ensure that your MySQL replication setup is functioning correctly.

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