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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.
A database link (DBlink) is a definition of how to establish a connection from one Oracle database to another. The following link types are supported: 1  Private database link-belongs to a specific schema of a database.2  Only the owner of a private database link can use it.3  Public database link-all users in the database can use it. 4  Global database link-defined in an OID or Oracle Names Server.he following link types are supported: 1  Private database link-belongs to a specific schema of a database. 2  Only the owner of a private database link can use it. 3  Public database link-all users in the database can use it. 4  Global database link-defined in an OID or Oracle Names Server.