I was recently working on security auditing for one of my clients. In this project, there was a requirement that all successful logins in the servers should be recorded. The solution for this requirement is a breeze! Just create logon triggers. I created logon trigger on server to catch all successful windows authentication as well SQL authenticated solutions. When I was done with this project, I made an interesting observation of executing a logon trigger multiple times. It was absolutely unexpected for me! As I was logging only once, naturally, I was expecting the entry only once. However, it did it multiple times on different threads – indeed an eccentric phenomenon at first sight!
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