It’s been over 5 years since I last blogged about trace flags, so it seems a post on the topic is in order. If a trace flag is undocumented, it means it is unsupported and not guaranteed. It can go away at any time, even from one service pack to the next. If a trace flag doesn’t work the way the person who told you about said it should ...

This is not a post about Jim Gray, much as I wish I had some news to share. It's about one of the reasons you should be really careful about using undocumented trace flags. I always try to warn people, whether I'm writing or speaking, about the dangers inherent when using any undocumented feature. Undocumented means unsupported! Microsoft retains ...