PostgreSQL · January 2, 2024

How to fix PostgreSQL Error Code: 25006 - read_only_sql_transaction

How to Fix PostgreSQL Error Code: 25006 - read_only_sql_transaction

PostgreSQL is a powerful open-source relational database management system that is widely used by developers and businesses around the world. However, like any software, PostgreSQL can encounter errors that can disrupt its normal operation. One such error is the PostgreSQL Error Code: 25006 - read_only_sql_transaction. In this article, we will explore the causes of this error and provide step-by-step instructions on how to fix it.

Understanding PostgreSQL Error Code: 25006 - read_only_sql_transaction

The PostgreSQL Error Code: 25006 - read_only_sql_transaction occurs when a transaction tries to modify data in a read-only transaction. In PostgreSQL, a read-only transaction is a transaction that is not allowed to modify any data in the database. This error typically occurs when a user or application attempts to execute a write operation, such as an INSERT, UPDATE, or DELETE statement, within a read-only transaction.

When this error occurs, PostgreSQL will roll back the transaction and return the error message "read_only_sql_transaction". This error message indicates that the transaction was not allowed to modify data due to the read-only mode.

Causes of PostgreSQL Error Code: 25006 - read_only_sql_transaction

There are several possible causes for the PostgreSQL Error Code: 25006 - read_only_sql_transaction:

  • Database Configuration: The database may be configured in read-only mode, either intentionally or unintentionally. This can happen if the database administrator sets the database to read-only mode for maintenance or backup purposes.
  • Transaction Isolation Level: The transaction isolation level may be set to "SERIALIZABLE" or "REPEATABLE READ", which prevents write operations within the transaction.
  • Application Code: The application code may be explicitly starting a read-only transaction and then attempting to modify data within that transaction.

Fixing PostgreSQL Error Code: 25006 - read_only_sql_transaction

To fix the PostgreSQL Error Code: 25006 - read_only_sql_transaction, follow these steps:

1. Check Database Configuration

First, check if the database is intentionally set to read-only mode. Connect to the database using a database client or command-line tool and run the following SQL command:

SELECT pg_is_in_recovery();

If the result is "true", it means the database is in recovery mode and is read-only. In this case, you will need to wait until the recovery process completes or contact the database administrator for further instructions.

2. Check Transaction Isolation Level

If the database is not in read-only mode, check the transaction isolation level. Connect to the database and run the following SQL command:

SHOW transaction_isolation;

If the result is "SERIALIZABLE" or "REPEATABLE READ", it means the transaction isolation level is preventing write operations. You can change the isolation level to "READ COMMITTED" by running the following SQL command:

SET transaction_isolation = 'READ COMMITTED';

3. Check Application Code

If the database configuration and transaction isolation level are not causing the error, review your application code. Look for any code that explicitly starts a read-only transaction and then attempts to modify data within that transaction. Modify the code to either remove the read-only transaction or move the write operations outside of the read-only transaction.

By following these steps, you should be able to fix the PostgreSQL Error Code: 25006 - read_only_sql_transaction and resume normal database operations.

Summary

In conclusion, the PostgreSQL Error Code: 25006 - read_only_sql_transaction occurs when a transaction tries to modify data in a read-only transaction. This error can be caused by database configuration, transaction isolation level, or application code. To fix this error, check the database configuration, adjust the transaction isolation level if necessary, and review the application code. If you encounter this error, contact the database administrator or refer to the PostgreSQL documentation for further assistance.

For reliable and high-performance VPS hosting solutions, consider Server.HK. Our VPS hosting services provide the flexibility and scalability you need to support your PostgreSQL databases and applications. Visit our website to learn more about our offerings and how we can help you succeed.

You may also like...