Error
Error Code:
1539
MariaDB Error 1539: Unknown Event Specified
Description
This error indicates that MariaDB cannot find a scheduled event with the specified name. It typically occurs when attempting to create, alter, drop, or execute an event that either does not exist, has been misspelled, or is referenced from an incorrect database context.
Error Message
Unknown event '%s'
Known Causes
4 known causesEvent does not exist or typo
The event name provided in the SQL statement does not correspond to any existing scheduled event in the current or specified database, or it contains a spelling mistake.
Incorrect database context
The event exists but is defined in a different database than the one currently active or explicitly specified in the SQL statement.
Insufficient user privileges
The user attempting the operation lacks the necessary `EVENT` or `ALTER` privileges for the database or the specific event.
Event dropped or renamed
The event might have been dropped, renamed, or altered by another user or process since the last check, making the current reference invalid.
Solutions
3 solutions available1. Verify Event Name and Existence easy
Check if the event name used in your query or script actually exists in the database.
1
Connect to your MariaDB server using a client (e.g., `mysql` command-line tool).
mysql -u your_user -p your_database2
List all available events in the database to confirm the correct name. Replace 'your_database' with your actual database name.
SHOW EVENTS FROM your_database;3
If the event exists, ensure you are spelling it correctly in your query or script. Case sensitivity might be a factor depending on your operating system and MariaDB configuration.
SELECT * FROM mysql.events WHERE EVENT_NAME = 'your_event_name'; -- Replace 'your_event_name' with the exact event name4
If the event does not exist, you will need to create it. Refer to MariaDB documentation for `CREATE EVENT` syntax.
-- Example: CREATE EVENT my_event ON SCHEDULE EVERY 1 DAY STARTS NOW DO ...2. Check Event Scheduler Status easy
Ensure the MariaDB event scheduler is enabled and running.
1
Connect to your MariaDB server.
mysql -u your_user -p2
Check the status of the event scheduler. The value should be `ON`.
SHOW VARIABLES LIKE 'event_scheduler';3
If `event_scheduler` is `OFF`, enable it. This setting is typically persistent if set in the MariaDB configuration file (`my.cnf` or `my.ini`).
SET GLOBAL event_scheduler = ON;4
To make the change permanent, edit your MariaDB configuration file (e.g., `/etc/my.cnf` or `/etc/mysql/mariadb.conf.d/50-server.cnf`) and add or modify the following line under the `[mysqld]` section:
[mysqld]
event_scheduler = ON5
Restart the MariaDB service for the configuration change to take effect.
sudo systemctl restart mariadb3. Review Stored Procedure or Function Call medium
If the error occurs within a stored procedure or function, verify the event name reference within that code.
1
Identify the stored procedure or function that is triggering the error. You might find this in your application logs or by tracing the execution flow.
USE your_database;
SHOW CREATE PROCEDURE your_procedure_name;
SHOW CREATE FUNCTION your_function_name;2
Examine the source code of the identified stored procedure or function for any references to events. Look for `CALL` statements targeting events or any logic that dynamically constructs event names.
-- Example of potential issue within a procedure:
-- CALL your_event_name(); -- If your_event_name is not a real event
-- SET @event_to_call = 'some_event';
-- PREPARE stmt FROM CONCAT('CALL ', @event_to_call, '()');
-- EXECUTE stmt; DEALLOCATE PREPARE stmt;3
Ensure that any event names referenced within the procedure or function are correct and that the events themselves exist. If event names are dynamically generated, ensure the logic correctly produces valid event names.
SELECT * FROM mysql.events WHERE EVENT_NAME = 'correct_event_name'; -- Verify existence