Where vacuum exists in the Atmosphere, air is sucked in. Where vacuum exists in Wikipedia (lack of active experts), the clueless and illogical are sucked in (I'm trying to be polite...). Databases are very common. Everybody is familiar with the term, and too many are not aware of the extent of the area and consider themselves experts. It includes many areas of expertise, and a non expert should not mess with article text's meaning. I checked and found that the article was bad until mid 2011, and then got a good boost by experts. However, they do not seem to be active lately, and the clueless try to takeover, unaware of the harm they can cause. Some tags are unnecessary, and many comments here do not make sense. 209.144.63.76