Very Large Database
A very large database (VLDB) is exactly what it sounds like—a database that takes up a great deal of storage space. What constitute a VLDB, of course, has changed and will continue to change over time. Currently, a database could fairly be called a VLDB if it occupies a terabyte or more of storage space, contains billions of table rows and supports complex queries.
http://en.wikipedia.org/wiki/Very_large_database http://searchoracle.techtarget.com/definition/Very-Large-Database http://encyclopedia2.thefreedictionary.com/VLDB http://www.pcmag.com/encyclopedia/term/54021/vldb