My (strong) preference is instead to use EXECUTE AS on the CREATE TRIGGER:
ALTER TRIGGER [SchemaChange_LogInTable_DDL]
ON ALL SERVER
WITH EXECUTE AS 'big_cheese_login'
FOR ...
...
SQL DBA,SQL Server MVP(07, 08, 09) "It's a dog-eat-dog world, and I'm wearing Milk-Bone underwear." "Norm", on "Cheers". Also from "Cheers", from "Carla": "You need to know 3 things about Tortelli men: Tortelli men draw women like flies; Tortelli men treat women like flies; Tortelli men's brains are in their flies".