- Identify the transaction causing the error by reviewing recent application logs or MySQL error logs. Look for any transactions that were attempted but failed due to the read-only restriction.
- Check the current transaction isolation level by executing the following SQL command:
SHOW VARIABLES LIKE 'transaction_isolation';
If it's set to a level that does not support writing, you may need to adjust it based on your application requirements.
- Verify the read-only status of your MySQL instance by running:
SHOW VARIABLES LIKE 'read_only';
If the value is `ON`, and your application needs to write to the database, you may need to turn it off with:
SET GLOBAL read_only = OFF;
Note: Ensure you have the necessary permissions to change this variable.
- Check if you are connected to a replica that is set to read-only mode. Replicas are often set to read-only to prevent accidental writes. If your application needs to write data, ensure it's connected to the primary database.
- If you are using managed MySQL services (like AWS RDS, Google Cloud SQL, etc.), check the database configuration in the service's console for any read-only settings or permissions that might be affecting your transactions.
- Review the database user's permissions to ensure they have write access if the transaction is supposed to modify data:
SHOW GRANTS FOR 'youruser'@'yourhost';
Replace `'youruser'@'yourhost'` with the actual username and host you're connecting from.
Each of these actions is aimed at identifying and rectifying the immediate cause of the "1180: Read-only transaction violation" error in MySQL.
