MySQL · December 20, 2023

How to Fix MySQL Error 1219 - SQLSTATE: HY000 (ER_QUERY_ON_MASTER) How to Fix MySQL Error running query on master: %s

How to Fix MySQL Error 1219 - SQLSTATE: HY000 (ER_QUERY_ON_MASTER) How to Fix MySQL Error running query on master: %s

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 1219 - SQLSTATE: HY000 (ER_QUERY_ON_MASTER), which occurs when running a query on the master server. In this article, we will explore the causes of this error and provide solutions to fix it.

Understanding MySQL Error 1219 - SQLSTATE: HY000 (ER_QUERY_ON_MASTER)

MySQL Error 1219 - SQLSTATE: HY000 (ER_QUERY_ON_MASTER) occurs when a query is executed on the master server, but the server is not configured correctly to handle the query. This error typically arises in a MySQL replication setup, where there are multiple servers involved.

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). The slaves replicate the data changes made on the master, ensuring data consistency across multiple servers.

When executing a query on the master server, MySQL checks if the query is safe to execute on the slaves. If the query is not safe, MySQL throws the Error 1219 - SQLSTATE: HY000 (ER_QUERY_ON_MASTER) to prevent potential data inconsistencies.

Causes of MySQL Error 1219 - SQLSTATE: HY000 (ER_QUERY_ON_MASTER)

There are several reasons why you might encounter MySQL Error 1219 - SQLSTATE: HY000 (ER_QUERY_ON_MASTER):

  • Unsafe Query: The query you are trying to execute on the master server is not safe to replicate on the slaves. This can happen if the query involves non-deterministic functions, user-defined functions, or temporary tables.
  • Missing Super Privilege: The user executing the query on the master server does not have the SUPER privilege, which is required to execute unsafe queries.
  • Replication Configuration: The replication configuration is not properly set up, causing MySQL to incorrectly identify a query as unsafe.

Fixing MySQL Error 1219 - SQLSTATE: HY000 (ER_QUERY_ON_MASTER)

To fix MySQL Error 1219 - SQLSTATE: HY000 (ER_QUERY_ON_MASTER), you can follow these steps:

1. Review the Query

Start by reviewing the query that triggered the error. Look for any non-deterministic functions, user-defined functions, or temporary tables that might make the query unsafe for replication. If possible, modify the query to make it safe for replication.

2. Grant SUPER Privilege

If the query is safe for replication but still triggers the error, ensure that the user executing the query on the master server has the SUPER privilege. You can grant the SUPER privilege using the following command:

GRANT SUPER ON *.* TO 'username'@'localhost';

Replace 'username' with the actual username of the user executing the query.

3. Check Replication Configuration

If the query is safe and the user has the SUPER privilege, but the error persists, check the replication configuration. Ensure that the replication configuration is correctly set up, and there are no misconfigurations causing MySQL to incorrectly identify the query as unsafe.

If you are unsure about the replication configuration, consult the MySQL documentation or seek assistance from a database administrator.

Summary

MySQL Error 1219 - SQLSTATE: HY000 (ER_QUERY_ON_MASTER) occurs when running a query on the master server in a MySQL replication setup. It can be caused by unsafe queries, missing SUPER privilege, or replication configuration issues.

To fix this error, review the query for any unsafe elements, grant the SUPER privilege to the user executing the query, and ensure the replication configuration is correctly set up.

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