V - Definitions
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Very Large Database (VLDB)
While there is apparently no official or standard definition for the term Very Large Database (VLDB), it is sometimes used to describe databases occupying magnetic storage in the terabyte range and containing billions of table rows.
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virtual (federated) database
A virtual database, also called a federated database, is a system in which several databases appear to function as a single entity.
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virtual private database (VPD)
A Virtual Private Database (VPD) makes the database tables seem like they belong to one user when multiple users may actually be using that table.