On some of my SQL 2005 or 2008 instances, when I want to view job history for a particular job, I will not get anything in the log file viewer for the job history. For example, I may have a transaction log backup job that runs every 30 minutes. I can tell it runs by looking at the properties of the job. It will tell me the last time it was executed. But if I want to view the job history, it is blank. How can I tun on job history in a sql instance?