Need to find out what ACCESS_METHODS_SCAN_RANGE_GENERATOR means as a Latch Wait type in MS-SQL 2005. I have a an instance that reports on a daily basis somewhere from 4000 to 5000 lock timeouts per second for a few minutes. We have I believe isolated the transaction taking place at the time, and I can see this type of Latch Wait taking place. But I am not able to understand the meaning of it.