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Description

This error indicates that the MariaDB server was unable to successfully modify a scheduled event. It typically occurs when attempting to use an `ALTER EVENT` statement, suggesting an issue with the event's definition, permissions, or its current state.

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Error Message

Failed to alter event '%s'

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Known Causes

4 known causes

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Insufficient Privileges

The user attempting to alter the event does not have the necessary `EVENT` privilege granted on the database.

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Event Not Found

The specified event name in the `ALTER EVENT` statement does not correspond to an existing scheduled event.

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Syntax Error in Statement

The `ALTER EVENT` statement contains a syntax error, preventing the server from parsing and executing the command correctly.

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Event Scheduler Disabled

The MariaDB event scheduler is not enabled, preventing any operations on scheduled events.

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Solutions

3 solutions available

1. Verify Event Existence and Permissions easy

Ensure the event exists and the user has the necessary privileges to alter it.

1

Connect to your MariaDB server as a user with sufficient privileges (e.g., root or a user with EVENT privilege).

mysql -u your_user -p

2

Check if the event you are trying to alter actually exists. Replace 'your_event_name' with the actual name of the event.

SHOW EVENTS LIKE 'your_event_name';

3

If the event exists, verify the user you are connecting with has the `EVENT` privilege on the database where the event resides, or global `EVENT` privilege. Replace 'your_user' and 'your_database' accordingly.

SHOW GRANTS FOR 'your_user'@'localhost';
-- Or to grant the privilege if missing:
GRANT EVENT ON your_database.* TO 'your_user'@'localhost';

4

If the event does not exist or you lack permissions, either create the event or grant the necessary privileges to your user.

2. Check Event Syntax and Definition medium

Invalid syntax or a malformed event definition can prevent alteration.

1

Retrieve the current definition of the event you are trying to alter. Replace 'your_event_name' and 'your_database' accordingly.

SELECT EVENT_DEFINITION FROM information_schema.events WHERE EVENT_NAME = 'your_event_name' AND EVENT_SCHEMA = 'your_database';

2

Carefully review the output of `EVENT_DEFINITION`. Look for any syntax errors, missing semicolons, incorrect keywords, or invalid SQL statements within the event's body.

3

If you find any syntax errors, correct them in your `ALTER EVENT` statement or by first dropping and recreating the event with the correct definition.

-- Example of correcting syntax:
ALTER EVENT your_event_name
ON SCHEDULE EVERY 1 HOUR
DO
  -- Corrected SQL statement here;
  SELECT 1;

4

Ensure that the `ALTER EVENT` statement itself is syntactically correct.

-- Correct ALTER EVENT syntax:
ALTER EVENT event_name
[DISABLE | ENABLE]
[COMMENT 'new_comment']
[DO sql_statement];

3. Restart MariaDB Service for Persistent Issues easy

Sometimes, a service restart can resolve transient issues affecting event management.

1

Connect to your MariaDB server's host machine via SSH or a terminal.

2

Restart the MariaDB service. The command may vary slightly depending on your operating system and MariaDB installation method.

# For systemd-based systems (e.g., Ubuntu 15.04+, Debian 8+, CentOS 7+):
sudo systemctl restart mariadb

# For SysVinit-based systems (older versions):
sudo service mysql restart

3

After the service has restarted, attempt to alter the event again.

mysql -u your_user -p
ALTER EVENT your_event_name ...;

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Related Errors

5 related errors

MariaDB Error 1540: Failed to alter event