What database method is used for faster retrieval of data?

The correct choice is an index, which is a crucial database structure designed to optimize the speed of data retrieval operations. An index functions much like an index in a book, where it provides a quick reference to where specific information can be found. By allowing the database management system to locate data without having to scan every row in a table, an index significantly increases the efficiency of queries.

When data is indexed, the database creates a structured format, usually involving pointers that redirect to the actual data locations. This minimizes the search time when retrieving data, especially in large datasets. In essence, using an index drastically reduces the amount of time it takes to access the data by enhancing the lookup ability of the database.

The other methods mentioned, such as a cursor, view, and trigger, serve different purposes in database operations. A cursor is primarily used to iterate over records one at a time, allowing for row-by-row processing, which can be slower than accessing data through an index. A view is essentially a saved query that allows users to see data in a particular format, without actually improving retrieval speeds. Finally, a trigger is a set of instructions that automatically execute in response to certain events on a particular table, which does not contribute to the speed of data retrieval