Error
Error Code:
1549
MariaDB Error 1549: Event Deletion Failure
Description
This error indicates that MariaDB was unable to remove a scheduled event from its internal `mysql.event` system table. This typically happens when attempting to drop an event that is either protected, non-existent, or due to insufficient permissions, preventing the clean removal of the event.
Error Message
Failed to delete the event from mysql.event
Known Causes
4 known causesInsufficient User Privileges
The MariaDB user attempting to delete the event lacks the necessary `EVENT` or `SUPER` privileges to modify the `mysql.event` table.
Event Does Not Exist
The specified event either does not exist in the `mysql.event` table, was already deleted, or its name was misspelled during the `DROP EVENT` command.
mysql.event Table Issues
The `mysql.event` system table itself might be corrupted, locked, or in a state that prevents write operations, leading to deletion failure.
Database in Read-Only Mode
The MariaDB server instance might be configured in read-only mode, which prevents any modifications to the database, including deleting events.
Solutions
4 solutions available1. Verify Event Existence and Permissions easy
Ensure the event exists and the user has DELETE privileges on the mysql.event table.
1
Connect to your MariaDB instance with a user that has sufficient privileges (e.g., root).
mysql -u your_user -p2
Check if the event you are trying to delete actually exists in the `mysql.event` table.
SELECT * FROM mysql.event WHERE name = 'your_event_name';
-- Replace 'your_event_name' with the actual name of the event.3
If the event exists, verify the privileges of the user attempting to delete it. The user needs the `DELETE` privilege on the `mysql.event` table.
SHOW GRANTS FOR 'your_user'@'your_host';
-- Replace 'your_user' and 'your_host' with the actual user and host.4
If the user lacks the necessary privilege, grant it. This is typically done by a user with `GRANT OPTION`.
GRANT DELETE ON mysql.event TO 'your_user'@'your_host';
FLUSH PRIVILEGES;
-- Replace 'your_user' and 'your_host' accordingly.5
Attempt to delete the event again.
DROP EVENT IF EXISTS your_event_name;
-- Replace 'your_event_name' with the actual name of the event.2. Restart MariaDB Service easy
A service restart can clear transient issues affecting event management.
1
Gracefully stop the MariaDB service. The command may vary depending on your operating system.
sudo systemctl stop mariadb2
Wait a few moments for the service to fully stop.
text3
Start the MariaDB service again.
sudo systemctl start mariadb4
Connect to MariaDB and attempt to delete the event.
mysql -u your_user -p
DROP EVENT IF EXISTS your_event_name;
-- Replace 'your_event_name' with the actual name of the event.3. Check for Conflicting Processes or Locks medium
Investigate if another process is holding a lock on the mysql.event table or the event itself.
1
Connect to MariaDB as a privileged user.
mysql -u your_user -p2
Inspect the `SHOW PROCESSLIST` to identify any long-running queries or processes that might be interacting with the `mysql.event` table.
SHOW FULL PROCESSLIST;3
Look for queries that involve `mysql.event` or seem to be related to event scheduling. If you find a suspicious process, you might need to kill it (use with caution).
KILL process_id;
-- Replace 'process_id' with the ID of the suspicious process.4
Check for table locks on `mysql.event`. While less common for event deletion, it's a possibility.
SHOW OPEN TABLES WHERE In_use > 0 AND Table_name = 'event' AND Database_name = 'mysql';5
If a lock is found and is unexpected, you may need to identify the blocking session and terminate it as described in step 3.
text6
After ensuring no conflicting processes, try deleting the event again.
DROP EVENT IF EXISTS your_event_name;
-- Replace 'your_event_name' with the actual name of the event.4. Manually Remove Event Entry from mysql.event Table advanced
Directly delete the event's record from the `mysql.event` table as a last resort.
1
**WARNING:** This is a manual intervention into system tables and should only be performed if other methods fail and you understand the risks. Always back up your database before proceeding.
text2
Connect to MariaDB with a privileged user.
mysql -u your_user -p3
Identify the specific row in the `mysql.event` table that corresponds to the event you want to delete. You can use the event name.
SELECT * FROM mysql.event WHERE name = 'your_event_name';
-- Replace 'your_event_name' with the actual name of the event.4
Note the `db`, `name`, and `definer` columns for the event. This information is crucial for constructing the DELETE statement.
text5
Execute a DELETE statement targeting the specific event. Be extremely precise with your WHERE clause.
DELETE FROM mysql.event WHERE db = 'your_database_name' AND name = 'your_event_name' AND definer = 'your_definer_user'@'your_definer_host';
-- Replace 'your_database_name', 'your_event_name', 'your_definer_user', and 'your_definer_host' with the actual values identified in the previous step.6
Flush privileges to ensure changes are recognized.
FLUSH PRIVILEGES;7
Verify the event is no longer listed.
SELECT * FROM mysql.event WHERE name = 'your_event_name';