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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.
Because a public library stores books, we could also say that a library is a database of books. But strictly defined, databases are computer structures that save, organize, protect, and deliver data. A system that contains databases is called a database management system, or DBM. The typical diagram representation for a database is a cylinder. Types of Databases. The simplest form of databases is a text database. When data is organized in a text file in rows and columns, it can be used to store, organize, protect, and retrieve data. Saving a list of names in a file, starting with first name and followed by last name, would be a simple database.