What is the main role of an index in a database?

  • Enforcing data integrity
  • Generating reports
  • Improving query performance
  • Storing data
The main role of an index in a database is to improve query performance by facilitating rapid data retrieval. An index is a data structure that contains keys derived from one or more columns of a table, allowing the database management system to locate specific rows efficiently. By reducing the number of disk accesses needed to fulfill queries, indexes speed up data retrieval operations and enhance overall system performance. 
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