An index improves the efficiency of _______ operations in a database.
- Deletion
- Insertion
- Retrieval
- Update
An index primarily enhances the efficiency of retrieval operations in a database. When a query needs to fetch specific data from a large dataset, indexes allow the database system to locate the required rows or entries more quickly, reducing the time it takes to retrieve data. This is particularly crucial in scenarios where databases deal with massive amounts of data and need to retrieve specific information efficiently.
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