ENABLE TRIGGER (Transact-SQL)
Enables a DML, DDL, or logon trigger.
Is the name of the schema to which the trigger belongs. schema_name cannot be specified for DDL or logon triggers.
Is the name of the trigger to be enabled.
Indicates that all triggers defined at the scope of the ON clause are enabled.
Is the name of the table or view on which the DML trigger trigger_name was created to execute.
For a DDL trigger, indicates that trigger_name was created or modified to execute with database scope.
- ALL SERVER
For a DDL or logon trigger, indicates that trigger_name was created or modified to execute with server scope.
Enabling a trigger does not re-create it. A disabled trigger still exists as an object in the current database, but does not fire. Enabling a trigger causes it to fire when any events on which it was originally programmed are executed. Triggers are disabled by using DISABLE TRIGGER. DML triggers defined on tables can also be disabled or enabled by using ALTER TABLE.
To enable a DML trigger, at a minimum, a user must have ALTER permission on the table or view on which the trigger was created.
To enable a DDL or logon trigger with server scope (ON ALL SERVER), a user must have CONTROL SERVER permission on the server. To enable a DDL trigger with database scope (ON DATABASE), at a minimum, a user must have ALTER ANY DATABASE DDL TRIGGER permission in the current database.
A. Enabling a DML trigger on a table
The following example disables trigger
uAddress that was created on table
Address, and then enables it.
USE AdventureWorks; GO DISABLE TRIGGER Person.uAddress ON Person.Address; GO ENABLE Trigger Person.uAddress ON Person.Address; GO
B. Enabling a DDL trigger
The following example creates a DDL trigger
safety with database scope, and then disables it.
IF EXISTS (SELECT * FROM sys.triggers WHERE parent_class = 0 AND name = 'safety') DROP TRIGGER safety ON DATABASE; GO CREATE TRIGGER safety ON DATABASE FOR DROP_TABLE, ALTER_TABLE AS PRINT 'You must disable Trigger "safety" to drop or alter tables!' ROLLBACK; GO DISABLE TRIGGER safety ON DATABASE; GO ENABLE TRIGGER safety ON DATABASE; GO
C. Enabling all triggers that were defined with the same scope
The following example enables all DDL and logon triggers that were created at the server scope.
USE AdventureWorks; GO ENABLE Trigger ALL ON ALL SERVER; GO