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About Indexes. Indexes are optional structures associated with tables and clusters that allow SQL statements to execute more quickly against a table. Just as the index in this manual helps you locate information faster than if there were no index, an Oracle Database index provides a faster access path to table data.
Examples of relational-database metadata include: 1  Tables of all tables in a database, their names, sizes and number of rows in each table. 2  Tables of columns in each database, what tables they are used in, and the type of data stored in each column.