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How to Fix MySQL Error 1199 – SQLSTATE: HY000 (ER_SLAVE_NOT_RUNNING) This operation requires a running slave; configure slave and do START SLAVE

How to Fix MySQL Error 1199 – SQLSTATE: HY000 (ER_SLAVE_NOT_RUNNING)

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 1199 – SQLSTATE: HY000 (ER_SLAVE_NOT_RUNNING). This error occurs when a specific operation requires a running slave, but the slave is not configured or started. In this article, we will explore the causes of this error and provide step-by-step instructions on how to fix it.

Causes of MySQL Error 1199

There are several reasons why you might encounter MySQL Error 1199 – SQLSTATE: HY000 (ER_SLAVE_NOT_RUNNING). Here are some common causes:

  • Missing or misconfigured slave: The error occurs when the operation requires a running slave, but the slave is not properly configured or started.
  • Slave not started: If the slave is not started, it cannot perform the required operation.
  • Network connectivity issues: If there are network connectivity issues between the master and the slave, the slave may not be able to run.

Fixing MySQL Error 1199

To fix MySQL Error 1199 – SQLSTATE: HY000 (ER_SLAVE_NOT_RUNNING), follow these steps:

Step 1: Check Slave Configuration

First, ensure that the slave is properly configured. Check the following:

  • Verify that the slave’s configuration file (usually my.cnf or my.ini) contains the correct settings for replication.
  • Ensure that the slave’s server ID is unique and different from the master’s server ID.
  • Confirm that the slave’s replication user credentials are correct.

Step 2: Start the Slave

If the slave is not running, start it using the following command:

START SLAVE;

This command tells the slave to start replicating data from the master.

Step 3: Check Slave Status

After starting the slave, check its status to ensure that it is running without any errors. Use the following command:

SHOW SLAVE STATUS;

This command displays information about the slave’s replication status. Look for the “Slave_IO_Running” and “Slave_SQL_Running” fields. If both are set to “Yes,” the slave is running correctly.

Step 4: Troubleshoot Network Connectivity

If the slave is still not running, check for network connectivity issues between the master and the slave. Ensure that:

  • The master and slave can communicate with each other over the network.
  • Firewalls or security groups are not blocking the necessary ports for replication.
  • There are no DNS resolution issues.

Fix any network connectivity issues to allow the slave to connect to the master and start replicating data.

Summary

In conclusion, MySQL Error 1199 – SQLSTATE: HY000 (ER_SLAVE_NOT_RUNNING) occurs when a specific operation requires a running slave, but the slave is not configured or started. To fix this error, ensure that the slave is properly configured, start the slave, check its status, and troubleshoot any network connectivity issues. If you need reliable and high-performance VPS hosting solutions, consider Server.HK. Our VPS hosting services are designed to meet the needs of businesses of all sizes.