Sebastiao Pereira creates a trigger:
Data Definition Language (DDL) is a group of SQL statements that can be executed to manage database objects. The idea is to create a database trigger that tracks and logs all changes to database schemas, including modifications to stored procedures, tables, views, and other schema objects and storing any event in one table.
Read on for an example of a database-level trigger. These are much less likely to cause performance problems compared to table-level triggers, though you could certainly cause issues via poor trigger definition.