PostgreSQL 42P05

DUPLICATE PSTATEMENT: Duplicate prepared statement name exists. This error occurs when a prepared statement with the same name already exists in the database.

How It Affects Your App

The PostgreSQL 42P05 DUPLICATE PSTATEMENT error indicates that a prepared statement already exists with the same name. This can cause the application to fail to execute the statement, resulting in an unexpected behavior. It can also lead to data inconsistency, as the application may not be able to execute the statement as expected. In addition, it can cause the application to become unresponsive or crash.

How To Fix

1. Identify the source of the error: PostgreSQL 42P05 is a “duplicate key value violates unique constraint” error. This means that a unique value is being inserted into a table that already exists.

2. Check the table definition to ensure that the unique constraint is properly defined:


3. Check the data being inserted to ensure that it is unique:

INSERT INTO my_table (name) VALUES ('John')

4. If the data is not unique, update the existing record instead of inserting a new one:

UPDATE my_table SET name = 'John' WHERE id = 1

5. Monitor the database for any future occurrences of the PostgreSQL 42P05 error: An automated database observability tool can be used to monitor the database for any future occurrences of the PostgreSQL 42P05 error. This tool can provide real-time alerts when the error occurs, allowing for quick resolution of the issue. Additionally, the tool can provide detailed insights into the root cause of the error, allowing for more efficient debugging and resolution.

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