YouTube. The owners of the largest online video library- YouTube is our number 7 candidate in our top 10 databases across the world. Reports say that about a 100 million videos are watched in YouTube which is about 60% of the overall number of videos watched online. Still the Wall Street Journal in 2006 reported that YouTube’s database features around 45 Terabytes of data. 45 terabytes won’t sound like a large number but when you consider that around 65,000 new videos are being posted daily in YouTube, just think of the database that they now are having.