MySQL 1062

This error occurs when a unique value is attempted to be inserted into a column that requires unique values. It is a MySQL 1062 error, and the literal message is "Duplicate entry '%s' for key '%s'".

How It Affects Your App

MySQL 1062 ER_DUP_ENTRY can have a significant impact on an application. It indicates that a duplicate entry has been attempted to be inserted into a table, which can cause data integrity issues. This can lead to data being overwritten or lost, as well as incorrect data being stored in the database. It can also cause queries to fail, resulting in the application not functioning as expected. In some cases, it can even cause the application to crash.

How To Fix

1. Identify the source of the MySQL 1062 error. This can be done by checking the error log for the MySQL server.
$ tail -f /var/log/mysql/error.log
2020-09-01T12:00:00.000Z 1062 [ERROR] Duplicate entry '1' for key 'PRIMARY'
2. Check the table structure to identify the primary key.
$ SHOW CREATE TABLE table_name;

CREATE TABLE `table_name` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
3. Check the data in the table to identify the duplicate entry.
$ SELECT * FROM table_name;

+----+-------+
| id | name |
+----+-------+
| 1 | John |
| 2 | David |
| 1 | John |
+----+-------+
4. Remove the duplicate entry.
$ DELETE FROM table_name WHERE id = 1;
5. Use an automated database observability tool to monitor and fix MySQL 1062 errors. Automated database observability tools can detect and alert on MySQL 1062 errors, as well as provide insights into the root cause of the error. This can help to quickly identify and fix the issue, as well as prevent similar issues from occurring in the future.

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