EC
1559
MariaDBERRORNotableEventsHIGH confidence

Event data is too long for the column

Production Risk

Low — DDL error; the event will not be created.

What this means

ER_EVENT_DATA_TOO_LONG (1559, SQLSTATE HY000) is raised when event metadata (such as the event body or comment) exceeds the maximum column length in mysql.event.

Why it happens
  1. 1Event body SQL is too large to be stored in mysql.event
  2. 2Event comment exceeds the maximum length
How to reproduce
trigger — this will error
trigger — this will error
CREATE EVENT my_event
ON SCHEDULE EVERY 1 HOUR
COMMENT 'This comment is extremely long...'  -- Exceeds column limit
DO SELECT 1;

expected output

ERROR 1559 (HY000): Data for column 'comment' is too long

Fix

Shorten the event body or comment

Shorten the event body or comment
CREATE EVENT my_event
ON SCHEDULE EVERY 1 HOUR
COMMENT 'Short comment'
DO SELECT 1;

-- For large event bodies, call a stored procedure:
CREATE EVENT my_event
ON SCHEDULE EVERY 1 HOUR
DO CALL my_heavy_proc();

Why this works

Keeping the event body concise by delegating to stored procedures avoids storage size limits.

Sources
Official documentation ↗

MySQL 8.0 — 1559 ER_EVENT_DATA_TOO_LONG

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