How long would a written warning from Oklahoma Highway Patrol be kept on record? Educated answers only plz!?

I got pulled over the other day for speeding on the highway. The trooper took my DL and was cool enough to give me a written warning. Does the Oklahoma Highway Patrol keep a database on these and if so how long would it be kept in it? I don't want to get pulled over twenty years from now and get gigged for something that happened long ago!