PostgreSQL 39004

NULL value not allowed. This error occurs when a NULL value is used in a column that does not accept NULL values. It is an indication that the query is attempting to insert or update a record with a NULL value in a column that does not allow NULL values.

How It Affects Your App

The error message PostgreSQL 39004 NULL VALUE NOT ALLOWED indicates that the application is attempting to insert a NULL value into a column that does not accept NULL values. This can cause the application to fail, as the database will not accept the data. It can also lead to data integrity issues, as the application may not be able to store the data it needs to. This can lead to data loss or incorrect data being stored in the database.

How To Fix

1. Identify the source of the PostgreSQL 39004 error:

SELECT * FROM pg_stat_activity WHERE state = 'idle in transaction';

2. Check the application code for any open transactions that are not being committed or rolled back:

BEGIN;SELECT * FROM table_name;

3. If any open transactions are found, commit or rollback the transaction:

COMMIT;

4. Check the PostgreSQL log files for any other errors that may be related to the 39004 error:

tail -f /var/log/postgresql/postgresql-.log

5. If any other errors are found, investigate and fix them.

6. Restart the PostgreSQL server:

sudo service postgresql restart

7. Monitor the PostgreSQL server for any further errors:

SELECT * FROM pg_stat_activity;

8. As a best practice, use an automated database observability tool to monitor and fix the PostgreSQL 39004 error. Automated database observability tools can provide real-time visibility into the performance and health of the database, allowing for faster detection and resolution of errors. Additionally, they can provide detailed insights into the root cause of the error, allowing for more efficient and effective resolution.

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