Wraith database is the central or primary collection of all Wraith knowledge. The database contains information on their spaceships, fleet, weapons technology and likely many other topics. When the Wraith negotiated an alliance with the Atlantis expedition, Nightwind gave a copy of their entire database to the expedition. The expedition later discovered the Wraith had planted a worm-like virus inside the information which deleted their copy of the Wraith database and also probed their computers, transmitting key information to the Wraith fleet before it erased itself. (SGA: "Allies")