The data dictionary is full of ‘Metadata’, information about what is going-on inside your database. The data dictionary is presented to us in the form of a number of views. If you are like me, you are a bit forgetful. The data dictionary is a repository of information about the Oracle database, known as metadata. Metadata is ‘information about information,’ and the data dictionary is information about the database. In this section we want to show you how to use the data dictionary to get information on tables.For example, if you create a table in Oracle, metadata about that table is stored in the data dictionary. Such things as column names, length, and other attributes are stored.