MySQL · December 20, 2023

How to Fix MySQL Error 1198 - SQLSTATE: HY000 (ER_SLAVE_MUST_STOP) This operation cannot be performed with a running slave; run STOP SLAVE first

How to Fix MySQL Error 1198 - SQLSTATE: HY000 (ER_SLAVE_MUST_STOP) This operation cannot be performed with a running slave; run STOP SLAVE first

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 MySQL Error 1198 - SQLSTATE: HY000 (ER_SLAVE_MUST_STOP), which occurs when attempting to perform an operation on a running slave without stopping it first. In this article, we will explore the causes of this error and provide step-by-step instructions on how to fix it.

Understanding MySQL Replication

Before diving into the error itself, it's important to understand the concept of MySQL replication. MySQL replication is a process that allows data to be copied from one MySQL database server (the master) to one or more MySQL database servers (the slaves). This replication process ensures data redundancy, improves performance, and provides fault tolerance.

When a slave is running, it continuously receives and applies changes from the master database. However, certain operations cannot be performed on a running slave, as they may conflict with the ongoing replication process. This is where the MySQL Error 1198 - SQLSTATE: HY000 (ER_SLAVE_MUST_STOP) comes into play.

Causes of MySQL Error 1198

The most common cause of MySQL Error 1198 is attempting to execute an operation on a running slave that conflicts with the replication process. Some examples of such operations include:

  • Changing the slave's configuration
  • Modifying the slave's replication filters
  • Altering the slave's table structure
  • Performing administrative tasks on the slave

When any of these operations are attempted without stopping the slave first, MySQL throws the Error 1198.

Fixing MySQL Error 1198

To fix MySQL Error 1198, you need to follow these steps:

1. Stop the Slave

The first step is to stop the running slave. This can be done using the following command:

STOP SLAVE;

This command stops the replication process on the slave, allowing you to perform the desired operation without encountering the error.

2. Perform the Operation

Once the slave is stopped, you can proceed with the operation that triggered the error. Whether it's changing the configuration, modifying replication filters, altering table structure, or performing administrative tasks, you can now execute the necessary commands without any issues.

3. Start the Slave

After successfully completing the operation, you can start the slave again using the following command:

START SLAVE;

This command resumes the replication process, ensuring that the slave stays up-to-date with the changes made on the master database.

Summary

In conclusion, MySQL Error 1198 - SQLSTATE: HY000 (ER_SLAVE_MUST_STOP) occurs when attempting to perform an operation on a running slave without stopping it first. To fix this error, you need to stop the slave, perform the desired operation, and then start the slave again. By following these steps, you can resolve the error and ensure the smooth functioning of your MySQL replication setup.

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