<p>A trigger was created without a DEFINER clause, so MySQL warns it will execute under the caller’s privileges, risking permission failures.</p>
<p>MySQL Error 1454 ER_TRG_NO_DEFINER arises when a trigger lacks a DEFINER user. Recreate the trigger with CREATE DEFINER='user'@'host' TRIGGER or drop and recreate it, ensuring the chosen account has the required privileges to prevent runtime failures in any region.</p>
No definer attribute for trigger '%s'.'%s'. The trigger
MySQL returns error 1454 when a trigger has no explicit DEFINER clause. Without a definer, the server announces the trigger will run using the invoking session's privileges, which might be too limited.
The warning becomes critical during dumps, restores, or upgrades because recreated triggers may silently fail if the invoker lacks rights. Fixing it preserves predictable privilege behaviour.
The most common cause is creating a trigger without including a DEFINER='user'@'host' clause. Older client tools often omit this syntax.
The error also appears after moving a dump between servers if the original definer account does not exist, forcing MySQL to strip the clause and emit error 1454 on restore.
Create or identify a dedicated database account that has all privileges needed by the trigger logic.
Drop the affected trigger and recreate it with a proper DEFINER clause or alter the definition if supported by your version. Verify privileges by running SHOW TRIGGERS.
On restore from mysqldump, add the option --routines and --triggers to keep definer information. If the original definer is not available, map it to a safe service account before running the dump.
During migration to cloud databases that block SUPER privilege, switch triggers to a definer account that has only the needed rights, satisfying provider restrictions.
Always specify a DEFINER clause when you CREATE TRIGGER in production schemas. Use a low-privilege service account, not root.
Store trigger definitions in version control and review them with tools like Galaxy so peer review ensures the definer is correct before deployment.
ER_PROCACCESS_DENIED_ERROR 1227 signals that the definer lacks privilege to execute a stored program. Grant EXECUTE or change the definer to fix.
ER_TRG_DOES_NOT_EXIST 1360 occurs when a referenced trigger name is missing; recreate or correct the name.
Developers often omit the DEFINER clause when first writing the trigger.
mysqldump strips invalid definers, so restored triggers lack a definer.
The account named in the definer was dropped, forcing recreation without a definer.
Stored routine cannot run because the definer lacks privilege.
Trigger referenced in statement does not exist; recreate or correct the name.
Trigger creation blocked by insufficient rights or read only mode.
In MySQL 8.0 you cannot ALTER TRIGGER; you must DROP and recreate it with the desired DEFINER.
The definer needs all table privileges referenced inside the trigger body plus TRIGGER privilege on the schema.
Using DEFINER=CURRENT_USER ties execution to the creator's account. Use a dedicated service account instead for consistency.
Galaxy flags missing definer clauses during query review and lets teams share corrected CREATE TRIGGER scripts.
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