EC
1449
MySQLERRORNotableSecurityHIGH confidence

Definer of view/routine no longer exists

What this means

ER_NO_SUCH_USER (1449) is returned when a view or stored procedure's DEFINER user no longer exists in the MySQL user table — typically after a user was dropped.

How to reproduce
trigger — this will error
trigger — this will error
-- Create a view as user 'old_user'@'localhost', then drop that user:
DROP USER 'old_user'@'localhost';
-- Now:
SELECT * FROM my_view;

expected output

ERROR 1449 (HY000): The user specified as a definer ('old_user'@'localhost') does not exist

Fix

Re-create the definer user or alter the definer

WHEN When the original definer no longer exists.

Re-create the definer user or alter the definer
-- Option 1: Re-create the missing user
CREATE USER 'old_user'@'localhost' IDENTIFIED BY 'password';
GRANT SELECT ON mydb.* TO 'old_user'@'localhost';

-- Option 2: Change the definer (MySQL 8.0+)
ALTER DEFINER = 'new_user'@'localhost' VIEW my_view AS
  SELECT * FROM my_table;

Why this works

ALTER DEFINER changes the security context under which the view or routine executes.

What not to do

✕ Drop and recreate views without auditing their definers first

When a user is dropped, all views and routines defined by that user become broken. Always audit INFORMATION_SCHEMA.ROUTINES and VIEWS before dropping users.

Sources
Official documentation ↗

MySQL 8.0 — 1449 ER_NO_SUCH_USER

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