📋

Description

This error signifies that MySQL cannot find an event with the specified name. It commonly occurs when attempting to create, alter, drop, or reference a scheduled event that either does not exist or is not accessible in the current database context.

💬

Error Message

Unknown event '%s'

🔍

Known Causes

4 known causes

⚠️

Event Name Mismatch

The event name provided in the SQL statement does not precisely match any existing event in the database.

⚠️

Event Not Created or Dropped

The event was never successfully created or was previously dropped, and the current operation attempts to reference it.

⚠️

Incorrect Database Context

The SQL statement is being executed in a database context where the specified event does not exist, even if it might exist in another database on the same server.

⚠️

Typographical Error or Case Sensitivity

A simple typo in the event name or incorrect casing (depending on the operating system and server's `lower_case_table_names` setting) prevents MySQL from finding the event.

🛠️

Solutions

3 solutions available

1. Verify Event Name Spelling and Existence easy

Ensure the event name in your query or code exactly matches an existing event in the database.

1

Connect to your MySQL server using a client like `mysql` command-line or a GUI tool.

mysql -u your_user -p your_database

2

List all available events to check for typos or confirm the event's existence. Replace 'your_database' with your actual database name.

SHOW EVENTS FROM your_database;

3

Carefully compare the event name you are trying to reference in your query or application code with the names listed in the output of `SHOW EVENTS`. Pay close attention to capitalization and any special characters.

TEXT

4

If the event name is misspelled, correct it in your query or application code. If the event does not exist, you will need to create it.

TEXT

2. Check Event Status and Creation Permissions medium

Confirm that the event is enabled and that the user executing the query has the necessary privileges to manage events.

1

Connect to your MySQL server.

mysql -u your_user -p

2

Query the `information_schema.events` table to get detailed information about the event, including its status. Replace 'your_database' and 'your_event_name' accordingly.

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

3

If the event's `STATUS` is 'DISABLED', you can enable it using the `ALTER EVENT` statement. Replace 'your_database' and 'your_event_name' accordingly.

ALTER EVENT your_database.your_event_name ENABLE;
SHOW EVENTS FROM your_database;

4

If you suspect permission issues, check if the user you are connecting with has the `EVENT` privilege. You can grant it if necessary (use with caution). Replace 'your_user' and 'your_database' accordingly.

SHOW GRANTS FOR 'your_user'@'localhost';
GRANT EVENT ON your_database.* TO 'your_user'@'localhost';
FLUSH PRIVILEGES;

3. Review Event Definition for Syntax Errors medium

Inspect the `CREATE EVENT` statement for any syntax errors that might prevent the event from being properly registered.

1

Retrieve the exact `CREATE EVENT` statement used to define the event. You can often find this in your application's deployment scripts or by querying `information_schema.events` and reconstructing it from the columns (though this can be complex). A more direct approach is to look at your source code or deployment scripts.

TEXT

2

Carefully examine the `CREATE EVENT` statement for any missing commas, incorrect keywords, misplaced parentheses, or invalid syntax within the `DO` clause. Ensure all SQL statements within the `DO` clause are valid.

TEXT

3

If you find syntax errors, correct the `CREATE EVENT` statement and re-execute it to recreate the event. Ensure you drop the existing event first if it partially exists but is invalid.

DROP EVENT IF EXISTS your_database.your_event_name;
-- Corrected CREATE EVENT statement here
CREATE EVENT your_database.your_event_name ...

🔗

Related Errors

5 related errors

MySQL Error 1539: Unknown Event Reference