MySQL 1179: Transaction is read-only.
MySQL 1179: Transaction is read-only.
When encountering the error 1179: Transaction is read-only in MySQL, follow these steps:
- Check the Transaction Read-Only Setting: Determine if the transaction is explicitly set to read-only. Run the following query within your session:
SHOW VARIABLES LIKE 'transactionreadonly';
If the value is `ON`, your transaction is set to read-only. To change it for the current session, execute:SET SESSION transactionreadonly = OFF;
- Inspect the Transaction Isolation Level: The transaction isolation level might be affecting the behavior. Check the current level by running:
SELECT @@GLOBAL.txisolation, @@txisolation;
If necessary, adjust the isolation level for your session. For example, to set it to READ-COMMITTED, use:SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
- Review User Permissions: Ensure your MySQL user has the necessary permissions to perform write operations. Verify permissions with:
SHOW GRANTS FOR CURRENT_USER;
If write permissions are missing, you might need to contact someone with administrative privileges or, if you have the necessary credentials, grant the permissions yourself (ensure you understand the security implications):GRANT INSERT, UPDATE, DELETE ON yourdatabasename.* TO 'yourusername'@'yourhost';
Replace `yourdatabasename`, `yourusername`, and `yourhost` with the actual database name, your MySQL username, and host, respectively.
- Check if Using a Read-Only Replica: If you're connected to a read-only replica of the database, you cannot perform write operations. Verify the server's role and switch to the primary (or master) server if necessary.
- Inspect System Variables: Some system variables can affect the read-only status of transactions. Check the global read_only variable by executing:
SHOW GLOBAL VARIABLES LIKE 'read_only';
If it’s set to `ON` and you have the necessary privileges, you can turn it off with:SET GLOBAL read_only = OFF;
Be cautious with this step as it affects the entire database server.
- Analyze Disk Space: Ensure the server has sufficient disk space. Running out of space can result in read-only mode to prevent data corruption. Check the disk space outside of MySQL using your operating system’s tools (like `df -h` on Linux).
- Review Database Logs: Look for any errors or warnings in the MySQL error log that might indicate why the transaction was set to read-only. The location of the log file varies, but you can find it by running:
SHOW VARIABLES LIKE 'log_error';
Then, check the contents of the log file for relevant messages.
Proceed with caution and ensure you understand the implications of each action, especially when modifying global variables or granting permissions.
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