FAQ : How triggers in SQL Server 2005 impact Tempdb

In SQL Server 2005 the triggers are implemented using Version store feature. In earlier versions (SQL Server 2000/ SQL 7), the trigger's Inserted and Deleted tables data were captured by reading Transaction log. But in SQL Server 2005, the Inserted and Deleted data is stored in Tempdb as row version. So, if you have more trigger in SQL Server 2005, it may impact Tempdb performance.