What is the primary advantage of using a Unique Primary Index in Teradata?

The primary advantage of using a Unique Primary Index (UPI) in Teradata is its ability to ensure data integrity and efficient data retrieval. A Unique Primary Index enforces uniqueness on the values of the indexed column(s) for each row in the table. This means that no two rows can have the same value for the primary index, which helps maintain the integrity of the data by preventing duplicate entries.

In addition to safeguarding data integrity, a Unique Primary Index enhances the efficiency of data retrieval operations. When a UPI is defined on a table, it allows the Teradata database to locate any specific row quickly and efficiently using its hashing mechanism, which maps the indexed value to a specific data block. This results in optimized performance for queries that access the table based on the indexed column(s).

While the other options mention aspects like security, backup procedures, and storage requirements, they do not directly relate to the primary advantages that a Unique Primary Index provides in terms of data integrity and the efficiency of data access in the Teradata system.