Which of the following is a primary advantage of index creation in databases?

• A. Increases data redundancy
• B. Improves query processing speed
• C. Enhances data security
• D. Reduces database size

Answer: (B)

The primary advantage of index creation in databases is that it improves query processing speed. Indexes are special data structures that facilitate faster data retrieval operations on a database table. When a query is executed, the database management system can utilize the index to locate the requested data more quickly than it could by searching through every record in the table sequentially. This reduces the amount of data scanned and accelerates the overall response time for queries, which is particularly beneficial for large datasets.

Though other options may seem relevant, they do not represent the fundamental benefit of indexing. For instance, increasing data redundancy would typically hinder database efficiency and integrity rather than enhance performance. Enhancing data security is not a primary function of an index; indexes are primarily designed for performance optimization. Similarly, while an index may influence the size of the database physically, creating indexes generally requires additional space rather than reducing overall database size. Thus, the improvement of query processing speed stands out as the key advantage of index creation.