dbowlin (8/16/2010)
Identity insert can be very dangerous. For a long time I couldn't see a use for it. Then I needed it to get 2 tables in 2 different databases into sync after they had fallen out of sync for some unknown reason. It saved me a lot of effort.
I move data from a Live table (with an identity on the PKey) into an Archive table. Just occasionally I need to move a row back into the Live table. Identity insert allows me to move it back with its original ID, thus maintaining references to this row from other tables. So there's one use for it.